Merge tag 'rtc-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni: "Here is the pull-request for the RTC subsystem for 4.13. Subsystem: - expose non volatile RAM using nvmem instead of open coding in many drivers. Unfortunately, this option has to be enabled by default to not break existing users. - rtctest can now test for cutoff dates, showing when an RTC will start failing to properly save time and date. - new RTC registration functions to remove race conditions in drivers Newly supported RTCs: - Broadcom STB wake-timer - Epson RX8130CE - Maxim IC DS1308 - STMicroelectronics STM32H7 Drivers: - ds1307: use regmap, use nvmem, more cleanups - ds3232: temperature reading support - gemini: renamed to ftrtc010 - m41t80: use CCF to expose the clock - rv8803: use nvmem - s3c: many cleanups - st-lpc: fix y2106 bug" * tag 'rtc-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (51 commits) rtc: Remove wrong deprecation comment nvmem: include linux/err.h from header rtc: st-lpc: make it robust against y2038/2106 bug rtc: rtctest: add check for problematic dates tools: timer: add rtctest_setdate rtc: ds1307: remove ds1307_remove rtc: ds1307: use generic nvmem rtc: ds1307: switch to rtc_register_device rtc: rv8803: remove rv8803_remove rtc: rv8803: use generic nvmem support rtc: rv8803: switch to rtc_register_device rtc: add generic nvmem support rtc: at91rm9200: remove race condition rtc: introduce new registration method rtc: class separate id allocation from registration rtc: class separate device allocation from registration rtc: stm32: add STM32H7 RTC support dt-bindings: rtc: stm32: add support for STM32H7 rtc: ds1307: add ds1308 variant rtc: ds3232: add temperature support ...
author: Linus Torvalds 2017-07-13 12:15:06 -0700
committer: Linus Torvalds 2017-07-13 12:15:06 -0700
commit: 3a00be19238ca330ce43abd33caac8eff343800c (patch)
tree: a19fd8bac6b20a6b7a5e742fb60adb629ce8c3e0 /drivers
parent: b5e16170f59b4ae38937b795a56a356fb95cca56 (diff)
parent: 40bf6a35483ee25271ce2a90d8976cf1409a033a (diff)
22 files changed, 1696 insertions, 839 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8d3b95728326..72419ac2c52a 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -77,6 +77,14 @@ config RTC_DEBUG
 	  Say yes here to enable debugging support in the RTC framework
 	  and individual RTC drivers.
 
+config RTC_NVMEM
+	bool "RTC non volatile storage support"
+	select NVMEM
+	default RTC_CLASS
+	help
+	  Say yes here to add support for the non volatile (often battery
+	  backed) storage present on RTCs.
+
 comment "RTC interfaces"
 
 config RTC_INTF_SYSFS
@@ -197,6 +205,17 @@ config RTC_DRV_AC100
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-ac100.
 
+config RTC_DRV_BRCMSTB
+	tristate "Broadcom STB wake-timer"
+	depends on ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST
+	default ARCH_BRCMSTB || BMIPS_GENERIC
+	help
+	  If you say yes here you get support for the wake-timer found on
+	  Broadcom STB SoCs (BCM7xxx).
+
+	  This driver can also be built as a module. If so, the module will
+	  be called rtc-brcmstb-waketimer.
+
 config RTC_DRV_AS3722
 	tristate "ams AS3722 RTC driver"
 	depends on MFD_AS3722
@@ -791,6 +810,14 @@ config RTC_DRV_DS3232
 	  This driver can also be built as a module.  If so, the module
 	  will be called rtc-ds3232.
 
+config RTC_DRV_DS3232_HWMON
+	bool "HWMON support for Dallas/Maxim DS3232/DS3234"
+	depends on RTC_DRV_DS3232 && HWMON && !(RTC_DRV_DS3232=y && HWMON=m)
+	default y
+	help
+	  Say Y here if you want to expose temperature sensor data on
+	  rtc-ds3232
+
 config RTC_DRV_PCF2127
 	tristate "NXP PCF2127"
 	depends on RTC_I2C_AND_SPI
@@ -1484,16 +1511,16 @@ config RTC_DRV_ARMADA38X
 	  This driver can also be built as a module. If so, the module
 	  will be called armada38x-rtc.
 
-config RTC_DRV_GEMINI
-	tristate "Gemini SoC RTC"
-	depends on ARCH_GEMINI || COMPILE_TEST
+config RTC_DRV_FTRTC010
+	tristate "Faraday Technology FTRTC010 RTC"
 	depends on HAS_IOMEM
+	default ARCH_GEMINI
 	help
 	  If you say Y here you will get support for the
-	  RTC found on Gemini SoC's.
+	  Faraday Technolog FTRTC010 found on e.g. Gemini SoC's.
 
 	  This driver can also be built as a module. If so, the module
-	  will be called rtc-gemini.
+	  will be called rtc-ftrtc010.
 
 config RTC_DRV_PS3
 	tristate "PS3 RTC"
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 13857d2fce09..acd366b41c85 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -15,6 +15,7 @@ ifdef CONFIG_RTC_DRV_EFI
 rtc-core-y			+= rtc-efi-platform.o
 endif
 
+rtc-core-$(CONFIG_RTC_NVMEM)		+= nvmem.o
 rtc-core-$(CONFIG_RTC_INTF_DEV)		+= rtc-dev.o
 rtc-core-$(CONFIG_RTC_INTF_PROC)	+= rtc-proc.o
 rtc-core-$(CONFIG_RTC_INTF_SYSFS)	+= rtc-sysfs.o
@@ -36,6 +37,7 @@ obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
 obj-$(CONFIG_RTC_DRV_BFIN)	+= rtc-bfin.o
+obj-$(CONFIG_RTC_DRV_BRCMSTB)	+= rtc-brcmstb-waketimer.o
 obj-$(CONFIG_RTC_DRV_BQ32K)	+= rtc-bq32k.o
 obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
@@ -67,7 +69,7 @@ obj-$(CONFIG_RTC_DRV_EFI)	+= rtc-efi.o
 obj-$(CONFIG_RTC_DRV_EM3027)	+= rtc-em3027.o
 obj-$(CONFIG_RTC_DRV_EP93XX)	+= rtc-ep93xx.o
 obj-$(CONFIG_RTC_DRV_FM3130)	+= rtc-fm3130.o
-obj-$(CONFIG_RTC_DRV_GEMINI)	+= rtc-gemini.o
+obj-$(CONFIG_RTC_DRV_FTRTC010)	+= rtc-ftrtc010.o
 obj-$(CONFIG_RTC_DRV_GENERIC)	+= rtc-generic.o
 obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o
 obj-$(CONFIG_RTC_DRV_HYM8563)	+= rtc-hym8563.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 5fb439897fe1..2ed970d61da1 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -150,59 +150,19 @@ static SIMPLE_DEV_PM_OPS(rtc_class_dev_pm_ops, rtc_suspend, rtc_resume);
 #define RTC_CLASS_DEV_PM_OPS	NULL
 #endif
 
-
-/**
- * rtc_device_register - register w/ RTC class
- * @dev: the device to register
- *
- * rtc_device_unregister() must be called when the class device is no
- * longer needed.
- *
- * Returns the pointer to the new struct class device.
- */
-struct rtc_device *rtc_device_register(const char *name, struct device *dev,
-					const struct rtc_class_ops *ops,
-					struct module *owner)
+/* Ensure the caller will set the id before releasing the device */
+static struct rtc_device *rtc_allocate_device(void)
 {
 	struct rtc_device *rtc;
-	struct rtc_wkalrm alrm;
-	int of_id = -1, id = -1, err;
-
-	if (dev->of_node)
-		of_id = of_alias_get_id(dev->of_node, "rtc");
-	else if (dev->parent && dev->parent->of_node)
-		of_id = of_alias_get_id(dev->parent->of_node, "rtc");
 
-	if (of_id >= 0) {
-		id = ida_simple_get(&rtc_ida, of_id, of_id + 1,
-				    GFP_KERNEL);
-		if (id < 0)
-			dev_warn(dev, "/aliases ID %d not available\n",
-				    of_id);
-	}
-
-	if (id < 0) {
-		id = ida_simple_get(&rtc_ida, 0, 0, GFP_KERNEL);
-		if (id < 0) {
-			err = id;
-			goto exit;
-		}
-	}
-
-	rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL);
-	if (rtc == NULL) {
-		err = -ENOMEM;
-		goto exit_ida;
-	}
+	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return NULL;
 
 	device_initialize(&rtc->dev);
 
-	rtc->id = id;
-	rtc->ops = ops;
-	rtc->owner = owner;
 	rtc->irq_freq = 1;
 	rtc->max_user_freq = 64;
-	rtc->dev.parent = dev;
 	rtc->dev.class = rtc_class;
 	rtc->dev.groups = rtc_get_dev_attribute_groups();
 	rtc->dev.release = rtc_device_release;
@@ -224,7 +184,64 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 	rtc->pie_timer.function = rtc_pie_update_irq;
 	rtc->pie_enabled = 0;
 
-	strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
+	return rtc;
+}
+
+static int rtc_device_get_id(struct device *dev)
+{
+	int of_id = -1, id = -1;
+
+	if (dev->of_node)
+		of_id = of_alias_get_id(dev->of_node, "rtc");
+	else if (dev->parent && dev->parent->of_node)
+		of_id = of_alias_get_id(dev->parent->of_node, "rtc");
+
+	if (of_id >= 0) {
+		id = ida_simple_get(&rtc_ida, of_id, of_id + 1, GFP_KERNEL);
+		if (id < 0)
+			dev_warn(dev, "/aliases ID %d not available\n", of_id);
+	}
+
+	if (id < 0)
+		id = ida_simple_get(&rtc_ida, 0, 0, GFP_KERNEL);
+
+	return id;
+}
+
+/**
+ * rtc_device_register - register w/ RTC class
+ * @dev: the device to register
+ *
+ * rtc_device_unregister() must be called when the class device is no
+ * longer needed.
+ *
+ * Returns the pointer to the new struct class device.
+ */
+struct rtc_device *rtc_device_register(const char *name, struct device *dev,
+					const struct rtc_class_ops *ops,
+					struct module *owner)
+{
+	struct rtc_device *rtc;
+	struct rtc_wkalrm alrm;
+	int id, err;
+
+	id = rtc_device_get_id(dev);
+	if (id < 0) {
+		err = id;
+		goto exit;
+	}
+
+	rtc = rtc_allocate_device();
+	if (!rtc) {
+		err = -ENOMEM;
+		goto exit_ida;
+	}
+
+	rtc->id = id;
+	rtc->ops = ops;
+	rtc->owner = owner;
+	rtc->dev.parent = dev;
+
 	dev_set_name(&rtc->dev, "rtc%d", id);
 
 	/* Check to see if there is an ALARM already set in hw */
@@ -238,20 +255,20 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 	err = cdev_device_add(&rtc->char_dev, &rtc->dev);
 	if (err) {
 		dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n",
-			 rtc->name, MAJOR(rtc->dev.devt), rtc->id);
+			 name, MAJOR(rtc->dev.devt), rtc->id);
 
 		/* This will free both memory and the ID */
 		put_device(&rtc->dev);
 		goto exit;
 	} else {
-		dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", rtc->name,
+		dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", name,
 			MAJOR(rtc->dev.devt), rtc->id);
 	}
 
 	rtc_proc_add_device(rtc);
 
 	dev_info(dev, "rtc core: registered %s as %s\n",
-			rtc->name, dev_name(&rtc->dev));
+			name, dev_name(&rtc->dev));
 
 	return rtc;
 
@@ -273,6 +290,8 @@ EXPORT_SYMBOL_GPL(rtc_device_register);
  */
 void rtc_device_unregister(struct rtc_device *rtc)
 {
+	rtc_nvmem_unregister(rtc);
+
 	mutex_lock(&rtc->ops_lock);
 	/*
 	 * Remove innards of this RTC, then disable it, before
@@ -356,6 +375,91 @@ void devm_rtc_device_unregister(struct device *dev, struct rtc_device *rtc)
 }
 EXPORT_SYMBOL_GPL(devm_rtc_device_unregister);
 
+static void devm_rtc_release_device(struct device *dev, void *res)
+{
+	struct rtc_device *rtc = *(struct rtc_device **)res;
+
+	if (rtc->registered)
+		rtc_device_unregister(rtc);
+	else
+		put_device(&rtc->dev);
+}
+
+struct rtc_device *devm_rtc_allocate_device(struct device *dev)
+{
+	struct rtc_device **ptr, *rtc;
+	int id, err;
+
+	id = rtc_device_get_id(dev);
+	if (id < 0)
+		return ERR_PTR(id);
+
+	ptr = devres_alloc(devm_rtc_release_device, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr) {
+		err = -ENOMEM;
+		goto exit_ida;
+	}
+
+	rtc = rtc_allocate_device();
+	if (!rtc) {
+		err = -ENOMEM;
+		goto exit_devres;
+	}
+
+	*ptr = rtc;
+	devres_add(dev, ptr);
+
+	rtc->id = id;
+	rtc->dev.parent = dev;
+	dev_set_name(&rtc->dev, "rtc%d", id);
+
+	return rtc;
+
+exit_devres:
+	devres_free(ptr);
+exit_ida:
+	ida_simple_remove(&rtc_ida, id);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(devm_rtc_allocate_device);
+
+int __rtc_register_device(struct module *owner, struct rtc_device *rtc)
+{
+	struct rtc_wkalrm alrm;
+	int err;
+
+	if (!rtc->ops)
+		return -EINVAL;
+
+	rtc->owner = owner;
+
+	/* Check to see if there is an ALARM already set in hw */
+	err = __rtc_read_alarm(rtc, &alrm);
+	if (!err && !rtc_valid_tm(&alrm.time))
+		rtc_initialize_alarm(rtc, &alrm);
+
+	rtc_dev_prepare(rtc);
+
+	err = cdev_device_add(&rtc->char_dev, &rtc->dev);
+	if (err)
+		dev_warn(rtc->dev.parent, "failed to add char device %d:%d\n",
+			 MAJOR(rtc->dev.devt), rtc->id);
+	else
+		dev_dbg(rtc->dev.parent, "char device (%d:%d)\n",
+			MAJOR(rtc->dev.devt), rtc->id);
+
+	rtc_proc_add_device(rtc);
+
+	rtc_nvmem_register(rtc);
+
+	rtc->registered = true;
+	dev_info(rtc->dev.parent, "registered as %s\n",
+		 dev_name(&rtc->dev));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__rtc_register_device);
+
 static int __init rtc_init(void)
 {
 	rtc_class = class_create(THIS_MODULE, "rtc");
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index fc0fa7577636..8cec9a02c0b8 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -227,6 +227,13 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 			missing = year;
 	}
 
+	/* Can't proceed if alarm is still invalid after replacing
+	 * missing fields.
+	 */
+	err = rtc_valid_tm(&alarm->time);
+	if (err)
+		goto done;
+
 	/* with luck, no rollover is needed */
 	t_now = rtc_tm_to_time64(&now);
 	t_alm = rtc_tm_to_time64(&alarm->time);
@@ -278,9 +285,9 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 		dev_warn(&rtc->dev, "alarm rollover not handled\n");
 	}
 
-done:
 	err = rtc_valid_tm(&alarm->time);
 
+done:
 	if (err) {
 		dev_warn(&rtc->dev, "invalid alarm value: %d-%d-%d %d:%d:%d\n",
 			alarm->time.tm_year + 1900, alarm->time.tm_mon + 1,
diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
new file mode 100644
index 000000000000..8567b4ed9ac6
--- /dev/null
+++ b/drivers/rtc/nvmem.c
@@ -0,0 +1,113 @@
+/*
+ * RTC subsystem, nvmem interface
+ *
+ * Copyright (C) 2017 Alexandre Belloni
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/rtc.h>
+#include <linux/sysfs.h>
+
+#include "rtc-core.h"
+
+/*
+ * Deprecated ABI compatibility, this should be removed at some point
+ */
+
+static const char nvram_warning[] = "Deprecated ABI, please use nvmem";
+
+static ssize_t
+rtc_nvram_read(struct file *filp, struct kobject *kobj,
+	       struct bin_attribute *attr,
+	       char *buf, loff_t off, size_t count)
+{
+	struct rtc_device *rtc = attr->private;
+
+	dev_warn_once(kobj_to_dev(kobj), nvram_warning);
+
+	return nvmem_device_read(rtc->nvmem, off, count, buf);
+}
+
+static ssize_t
+rtc_nvram_write(struct file *filp, struct kobject *kobj,
+		struct bin_attribute *attr,
+		char *buf, loff_t off, size_t count)
+{
+	struct rtc_device *rtc = attr->private;
+
+	dev_warn_once(kobj_to_dev(kobj), nvram_warning);
+
+	return nvmem_device_write(rtc->nvmem, off, count, buf);
+}
+
+static int rtc_nvram_register(struct rtc_device *rtc)
+{
+	int err;
+
+	rtc->nvram = devm_kzalloc(rtc->dev.parent,
+				sizeof(struct bin_attribute),
+				GFP_KERNEL);
+	if (!rtc->nvram)
+		return -ENOMEM;
+
+	rtc->nvram->attr.name = "nvram";
+	rtc->nvram->attr.mode = 0644;
+	rtc->nvram->private = rtc;
+
+	sysfs_bin_attr_init(rtc->nvram);
+
+	rtc->nvram->read = rtc_nvram_read;
+	rtc->nvram->write = rtc_nvram_write;
+	rtc->nvram->size = rtc->nvmem_config->size;
+
+	err = sysfs_create_bin_file(&rtc->dev.parent->kobj,
+				    rtc->nvram);
+	if (err) {
+		devm_kfree(rtc->dev.parent, rtc->nvram);
+		rtc->nvram = NULL;
+	}
+
+	return err;
+}
+
+static void rtc_nvram_unregister(struct rtc_device *rtc)
+{
+	sysfs_remove_bin_file(&rtc->dev.parent->kobj, rtc->nvram);
+}
+
+/*
+ * New ABI, uses nvmem
+ */
+void rtc_nvmem_register(struct rtc_device *rtc)
+{
+	if (!rtc->nvmem_config)
+		return;
+
+	rtc->nvmem_config->dev = &rtc->dev;
+	rtc->nvmem_config->owner = rtc->owner;
+	rtc->nvmem = nvmem_register(rtc->nvmem_config);
+	if (IS_ERR_OR_NULL(rtc->nvmem))
+		return;
+
+	/* Register the old ABI */
+	if (rtc->nvram_old_abi)
+		rtc_nvram_register(rtc);
+}
+
+void rtc_nvmem_unregister(struct rtc_device *rtc)
+{
+	if (IS_ERR_OR_NULL(rtc->nvmem))
+		return;
+
+	/* unregister the old ABI */
+	if (rtc->nvram)
+		rtc_nvram_unregister(rtc);
+
+	nvmem_unregister(rtc->nvmem);
+}
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index b60fd477778f..e221b78b6f10 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -409,6 +409,11 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+	platform_set_drvdata(pdev, rtc);
+
 	sclk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(sclk))
 		return PTR_ERR(sclk);
@@ -441,13 +446,10 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 	if (!device_can_wakeup(&pdev->dev))
 		device_init_wakeup(&pdev->dev, 1);
 
-	rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
-				&at91_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc)) {
-		ret = PTR_ERR(rtc);
+	rtc->ops = &at91_rtc_ops;
+	ret = rtc_register_device(rtc);
+	if (ret)
 		goto err_clk;
-	}
-	platform_set_drvdata(pdev, rtc);
 
 	/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
 	 * completion.
diff --git a/drivers/rtc/rtc-brcmstb-waketimer.c b/drivers/rtc/rtc-brcmstb-waketimer.c
new file mode 100644
index 000000000000..796ac792a381
--- /dev/null
+++ b/drivers/rtc/rtc-brcmstb-waketimer.c
@@ -0,0 +1,330 @@
+/*
+ * Copyright © 2014-2017 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_wakeup.h>
+#include <linux/reboot.h>
+#include <linux/rtc.h>
+#include <linux/stat.h>
+#include <linux/suspend.h>
+
+struct brcmstb_waketmr {
+	struct rtc_device *rtc;
+	struct device *dev;
+	void __iomem *base;
+	int irq;
+	struct notifier_block reboot_notifier;
+	struct clk *clk;
+	u32 rate;
+};
+
+#define BRCMSTB_WKTMR_EVENT		0x00
+#define BRCMSTB_WKTMR_COUNTER		0x04
+#define BRCMSTB_WKTMR_ALARM		0x08
+#define BRCMSTB_WKTMR_PRESCALER		0x0C
+#define BRCMSTB_WKTMR_PRESCALER_VAL	0x10
+
+#define BRCMSTB_WKTMR_DEFAULT_FREQ	27000000
+
+static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
+{
+	writel_relaxed(1, timer->base + BRCMSTB_WKTMR_EVENT);
+	(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
+}
+
+static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
+				      unsigned int secs)
+{
+	brcmstb_waketmr_clear_alarm(timer);
+
+	writel_relaxed(secs + 1, timer->base + BRCMSTB_WKTMR_ALARM);
+}
+
+static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
+{
+	struct brcmstb_waketmr *timer = data;
+
+	pm_wakeup_event(timer->dev, 0);
+
+	return IRQ_HANDLED;
+}
+
+struct wktmr_time {
+	u32 sec;
+	u32 pre;
+};
+
+static void wktmr_read(struct brcmstb_waketmr *timer,
+		       struct wktmr_time *t)
+{
+	u32 tmp;
+
+	do {
+		t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
+		tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
+	} while (tmp >= timer->rate);
+
+	t->pre = timer->rate - tmp;
+}
+
+static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
+{
+	struct device *dev = timer->dev;
+	int ret = 0;
+
+	if (device_may_wakeup(dev)) {
+		ret = enable_irq_wake(timer->irq);
+		if (ret) {
+			dev_err(dev, "failed to enable wake-up interrupt\n");
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+/* If enabled as a wakeup-source, arm the timer when powering off */
+static int brcmstb_waketmr_reboot(struct notifier_block *nb,
+		unsigned long action, void *data)
+{
+	struct brcmstb_waketmr *timer;
+
+	timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);
+
+	/* Set timer for cold boot */
+	if (action == SYS_POWER_OFF)
+		brcmstb_waketmr_prepare_suspend(timer);
+
+	return NOTIFY_DONE;
+}
+
+static int brcmstb_waketmr_gettime(struct device *dev,
+				   struct rtc_time *tm)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+	struct wktmr_time now;
+
+	wktmr_read(timer, &now);
+
+	rtc_time_to_tm(now.sec, tm);
+
+	return 0;
+}
+
+static int brcmstb_waketmr_settime(struct device *dev,
+				   struct rtc_time *tm)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+	time64_t sec;
+
+	sec = rtc_tm_to_time64(tm);
+
+	if (sec > U32_MAX || sec < 0)
+		return -EINVAL;
+
+	writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
+
+	return 0;
+}
+
+static int brcmstb_waketmr_getalarm(struct device *dev,
+				    struct rtc_wkalrm *alarm)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+	time64_t sec;
+	u32 reg;
+
+	sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM);
+	if (sec != 0) {
+		/* Alarm is enabled */
+		alarm->enabled = 1;
+		rtc_time64_to_tm(sec, &alarm->time);
+	}
+
+	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
+	alarm->pending = !!(reg & 1);
+
+	return 0;
+}
+
+static int brcmstb_waketmr_setalarm(struct device *dev,
+				     struct rtc_wkalrm *alarm)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+	time64_t sec;
+
+	if (alarm->enabled)
+		sec = rtc_tm_to_time64(&alarm->time);
+	else
+		sec = 0;
+
+	if (sec > U32_MAX || sec < 0)
+		return -EINVAL;
+
+	brcmstb_waketmr_set_alarm(timer, sec);
+
+	return 0;
+}
+
+/*
+ * Does not do much but keep the RTC class happy. We always support
+ * alarms.
+ */
+static int brcmstb_waketmr_alarm_enable(struct device *dev,
+					unsigned int enabled)
+{
+	return 0;
+}
+
+static const struct rtc_class_ops brcmstb_waketmr_ops = {
+	.read_time	= brcmstb_waketmr_gettime,
+	.set_time	= brcmstb_waketmr_settime,
+	.read_alarm	= brcmstb_waketmr_getalarm,
+	.set_alarm	= brcmstb_waketmr_setalarm,
+	.alarm_irq_enable = brcmstb_waketmr_alarm_enable,
+};
+
+static int brcmstb_waketmr_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct brcmstb_waketmr *timer;
+	struct resource *res;
+	int ret;
+
+	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
+	if (!timer)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, timer);
+	timer->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	timer->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(timer->base))
+		return PTR_ERR(timer->base);
+
+	/*
+	 * Set wakeup capability before requesting wakeup interrupt, so we can
+	 * process boot-time "wakeups" (e.g., from S5 soft-off)
+	 */
+	device_set_wakeup_capable(dev, true);
+	device_wakeup_enable(dev);
+
+	timer->irq = platform_get_irq(pdev, 0);
+	if (timer->irq < 0)
+		return -ENODEV;
+
+	timer->clk = devm_clk_get(dev, NULL);
+	if (!IS_ERR(timer->clk)) {
+		ret = clk_prepare_enable(timer->clk);
+		if (ret)
+			return ret;
+		timer->rate = clk_get_rate(timer->clk);
+		if (!timer->rate)
+			timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
+	} else {
+		timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
+		timer->clk = NULL;
+	}
+
+	ret = devm_request_irq(dev, timer->irq, brcmstb_waketmr_irq, 0,
+			       "brcmstb-waketimer", timer);
+	if (ret < 0)
+		return ret;
+
+	timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
+	register_reboot_notifier(&timer->reboot_notifier);
+
+	timer->rtc = rtc_device_register("brcmstb-waketmr", dev,
+					 &brcmstb_waketmr_ops, THIS_MODULE);
+	if (IS_ERR(timer->rtc)) {
+		dev_err(dev, "unable to register device\n");
+		unregister_reboot_notifier(&timer->reboot_notifier);
+		return PTR_ERR(timer->rtc);
+	}
+
+	dev_info(dev, "registered, with irq %d\n", timer->irq);
+
+	return ret;
+}
+
+static int brcmstb_waketmr_remove(struct platform_device *pdev)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);
+
+	unregister_reboot_notifier(&timer->reboot_notifier);
+	rtc_device_unregister(timer->rtc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int brcmstb_waketmr_suspend(struct device *dev)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+
+	return brcmstb_waketmr_prepare_suspend(timer);
+}
+
+static int brcmstb_waketmr_resume(struct device *dev)
+{
+	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
+	int ret;
+
+	if (!device_may_wakeup(dev))
+		return 0;
+
+	ret = disable_irq_wake(timer->irq);
+
+	brcmstb_waketmr_clear_alarm(timer);
+
+	return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(brcmstb_waketmr_pm_ops,
+			 brcmstb_waketmr_suspend, brcmstb_waketmr_resume);
+
+static const struct of_device_id brcmstb_waketmr_of_match[] = {
+	{ .compatible = "brcm,brcmstb-waketimer" },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver brcmstb_waketmr_driver = {
+	.probe			= brcmstb_waketmr_probe,
+	.remove			= brcmstb_waketmr_remove,
+	.driver = {
+		.name		= "brcmstb-waketimer",
+		.pm		= &brcmstb_waketmr_pm_ops,
+		.of_match_table	= of_match_ptr(brcmstb_waketmr_of_match),
+	}
+};
+module_platform_driver(brcmstb_waketmr_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Brian Norris");
+MODULE_AUTHOR("Markus Mayer");
+MODULE_DESCRIPTION("Wake-up timer driver for STB chips");
diff --git a/drivers/rtc/rtc-core.h b/drivers/rtc/rtc-core.h
index 7a4ed2f7c7d7..ecab76a3207c 100644
--- a/drivers/rtc/rtc-core.h
+++ b/drivers/rtc/rtc-core.h
@@ -45,3 +45,11 @@ static inline const struct attribute_group **rtc_get_dev_attribute_groups(void)
 	return NULL;
 }
 #endif
+
+#ifdef CONFIG_RTC_NVMEM
+void rtc_nvmem_register(struct rtc_device *rtc);
+void rtc_nvmem_unregister(struct rtc_device *rtc);
+#else
+static inline void rtc_nvmem_register(struct rtc_device *rtc) {}
+static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}
+#endif
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index e81a8711fea7..794bc4fa4937 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -464,7 +464,7 @@ void rtc_dev_prepare(struct rtc_device *rtc)
 		return;
 
 	if (rtc->id >= RTC_DEV_MAX) {
-		dev_dbg(&rtc->dev, "%s: too many RTC devices\n", rtc->name);
+		dev_dbg(&rtc->dev, "too many RTC devices\n");
 		return;
 	}
 
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 77339b3d50a1..4fac49e55d47 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -24,6 +24,7 @@
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/clk-provider.h>
+#include <linux/regmap.h>
 
 /*
  * We can't determine type by probing, but if we expect pre-Linux code
@@ -33,6 +34,7 @@
  */
 enum ds_type {
 	ds_1307,
+	ds_1308,
 	ds_1337,
 	ds_1338,
 	ds_1339,
@@ -43,6 +45,7 @@ enum ds_type {
 	m41t00,
 	mcp794xx,
 	rx_8025,
+	rx_8130,
 	last_ds_type /* always last */
 	/* rs5c372 too?  different address... */
 };
@@ -115,17 +118,16 @@ struct ds1307 {
 	u8			offset; /* register's offset */
 	u8			regs[11];
 	u16			nvram_offset;
-	struct bin_attribute	*nvram;
+	struct nvmem_config	nvmem_cfg;
 	enum ds_type		type;
 	unsigned long		flags;
 #define HAS_NVRAM	0		/* bit 0 == sysfs file active */
 #define HAS_ALARM	1		/* bit 1 == irq claimed */
-	struct i2c_client	*client;
+	struct device		*dev;
+	struct regmap		*regmap;
+	const char		*name;
+	int			irq;
 	struct rtc_device	*rtc;
-	s32 (*read_block_data)(const struct i2c_client *client, u8 command,
-			       u8 length, u8 *values);
-	s32 (*write_block_data)(const struct i2c_client *client, u8 command,
-				u8 length, const u8 *values);
 #ifdef CONFIG_COMMON_CLK
 	struct clk_hw		clks[2];
 #endif
@@ -135,21 +137,30 @@ struct chip_desc {
 	unsigned		alarm:1;
 	u16			nvram_offset;
 	u16			nvram_size;
+	u8			century_reg;
+	u8			century_enable_bit;
+	u8			century_bit;
 	u16			trickle_charger_reg;
 	u8			trickle_charger_setup;
-	u8			(*do_trickle_setup)(struct i2c_client *, uint32_t, bool);
+	u8			(*do_trickle_setup)(struct ds1307 *, uint32_t,
+						    bool);
 };
 
-static u8 do_trickle_setup_ds1339(struct i2c_client *,
-				  uint32_t ohms, bool diode);
+static u8 do_trickle_setup_ds1339(struct ds1307 *, uint32_t ohms, bool diode);
 
 static struct chip_desc chips[last_ds_type] = {
 	[ds_1307] = {
 		.nvram_offset	= 8,
 		.nvram_size	= 56,
 	},
+	[ds_1308] = {
+		.nvram_offset	= 8,
+		.nvram_size	= 56,
+	},
 	[ds_1337] = {
 		.alarm		= 1,
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
 	},
 	[ds_1338] = {
 		.nvram_offset	= 8,
@@ -157,10 +168,15 @@ static struct chip_desc chips[last_ds_type] = {
 	},
 	[ds_1339] = {
 		.alarm		= 1,
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
 		.trickle_charger_reg = 0x10,
 		.do_trickle_setup = &do_trickle_setup_ds1339,
 	},
 	[ds_1340] = {
+		.century_reg	= DS1307_REG_HOUR,
+		.century_enable_bit = DS1340_BIT_CENTURY_EN,
+		.century_bit	= DS1340_BIT_CENTURY,
 		.trickle_charger_reg = 0x08,
 	},
 	[ds_1388] = {
@@ -168,6 +184,14 @@ static struct chip_desc chips[last_ds_type] = {
 	},
 	[ds_3231] = {
 		.alarm		= 1,
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
+	},
+	[rx_8130] = {
+		.alarm		= 1,
+		/* this is battery backed SRAM */
+		.nvram_offset	= 0x20,
+		.nvram_size	= 4,	/* 32bit (4 word x 8 bit) */
 	},
 	[mcp794xx] = {
 		.alarm		= 1,
@@ -179,6 +203,7 @@ static struct chip_desc chips[last_ds_type] = {
 
 static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1307", ds_1307 },
+	{ "ds1308", ds_1308 },
 	{ "ds1337", ds_1337 },
 	{ "ds1338", ds_1338 },
 	{ "ds1339", ds_1339 },
@@ -192,6 +217,7 @@ static const struct i2c_device_id ds1307_id[] = {
 	{ "pt7c4338", ds_1307 },
 	{ "rx8025", rx_8025 },
 	{ "isl12057", ds_1337 },
+	{ "rx8130", rx_8130 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ds1307_id);
@@ -203,6 +229,10 @@ static const struct of_device_id ds1307_of_match[] = {
 		.data = (void *)ds_1307
 	},
 	{
+		.compatible = "dallas,ds1308",
+		.data = (void *)ds_1308
+	},
+	{
 		.compatible = "dallas,ds1337",
 		.data = (void *)ds_1337
 	},
@@ -262,6 +292,7 @@ MODULE_DEVICE_TABLE(of, ds1307_of_match);
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id ds1307_acpi_ids[] = {
 	{ .id = "DS1307", .driver_data = ds_1307 },
+	{ .id = "DS1308", .driver_data = ds_1308 },
 	{ .id = "DS1337", .driver_data = ds_1337 },
 	{ .id = "DS1338", .driver_data = ds_1338 },
 	{ .id = "DS1339", .driver_data = ds_1339 },
@@ -280,136 +311,6 @@ static const struct acpi_device_id ds1307_acpi_ids[] = {
 MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids);
 #endif
 
-/*----------------------------------------------------------------------*/
-
-#define BLOCK_DATA_MAX_TRIES 10
-
-static s32 ds1307_read_block_data_once(const struct i2c_client *client,
-				       u8 command, u8 length, u8 *values)
-{
-	s32 i, data;
-
-	for (i = 0; i < length; i++) {
-		data = i2c_smbus_read_byte_data(client, command + i);
-		if (data < 0)
-			return data;
-		values[i] = data;
-	}
-	return i;
-}
-
-static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command,
-				  u8 length, u8 *values)
-{
-	u8 oldvalues[255];
-	s32 ret;
-	int tries = 0;
-
-	dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length);
-	ret = ds1307_read_block_data_once(client, command, length, values);
-	if (ret < 0)
-		return ret;
-	do {
-		if (++tries > BLOCK_DATA_MAX_TRIES) {
-			dev_err(&client->dev,
-				"ds1307_read_block_data failed\n");
-			return -EIO;
-		}
-		memcpy(oldvalues, values, length);
-		ret = ds1307_read_block_data_once(client, command, length,
-						  values);
-		if (ret < 0)
-			return ret;
-	} while (memcmp(oldvalues, values, length));
-	return length;
-}
-
-static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command,
-				   u8 length, const u8 *values)
-{
-	u8 currvalues[255];
-	int tries = 0;
-
-	dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length);
-	do {
-		s32 i, ret;
-
-		if (++tries > BLOCK_DATA_MAX_TRIES) {
-			dev_err(&client->dev,
-				"ds1307_write_block_data failed\n");
-			return -EIO;
-		}
-		for (i = 0; i < length; i++) {
-			ret = i2c_smbus_write_byte_data(client, command + i,
-							values[i]);
-			if (ret < 0)
-				return ret;
-		}
-		ret = ds1307_read_block_data_once(client, command, length,
-						  currvalues);
-		if (ret < 0)
-			return ret;
-	} while (memcmp(currvalues, values, length));
-	return length;
-}
-
-/*----------------------------------------------------------------------*/
-
-/* These RTC devices are not designed to be connected to a SMbus adapter.
-   SMbus limits block operations length to 32 bytes, whereas it's not
-   limited on I2C buses. As a result, accesses may exceed 32 bytes;
-   in that case, split them into smaller blocks */
-
-static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client,
-				u8 command, u8 length, const u8 *values)
-{
-	u8 suboffset = 0;
-
-	if (length <= I2C_SMBUS_BLOCK_MAX) {
-		s32 retval = i2c_smbus_write_i2c_block_data(client,
-					command, length, values);
-		if (retval < 0)
-			return retval;
-		return length;
-	}
-
-	while (suboffset < length) {
-		s32 retval = i2c_smbus_write_i2c_block_data(client,
-				command + suboffset,
-				min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
-				values + suboffset);
-		if (retval < 0)
-			return retval;
-
-		suboffset += I2C_SMBUS_BLOCK_MAX;
-	}
-	return length;
-}
-
-static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
-				u8 command, u8 length, u8 *values)
-{
-	u8 suboffset = 0;
-
-	if (length <= I2C_SMBUS_BLOCK_MAX)
-		return i2c_smbus_read_i2c_block_data(client,
-					command, length, values);
-
-	while (suboffset < length) {
-		s32 retval = i2c_smbus_read_i2c_block_data(client,
-				command + suboffset,
-				min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
-				values + suboffset);
-		if (retval < 0)
-			return retval;
-
-		suboffset += I2C_SMBUS_BLOCK_MAX;
-	}
-	return length;
-}
-
-/*----------------------------------------------------------------------*/
-
 /*
  * The ds1337 and ds1339 both have two alarms, but we only use the first
  * one (with a "seconds" field).  For ds1337 we expect nINTA is our alarm
@@ -417,27 +318,24 @@ static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
  */
 static irqreturn_t ds1307_irq(int irq, void *dev_id)
 {
-	struct i2c_client	*client = dev_id;
-	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	struct ds1307		*ds1307 = dev_id;
 	struct mutex		*lock = &ds1307->rtc->ops_lock;
-	int			stat, control;
+	int			stat, ret;
 
 	mutex_lock(lock);
-	stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
-	if (stat < 0)
+	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
+	if (ret)
 		goto out;
 
 	if (stat & DS1337_BIT_A1I) {
 		stat &= ~DS1337_BIT_A1I;
-		i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat);
+		regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
 
-		control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
-		if (control < 0)
+		ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+					 DS1337_BIT_A1IE, 0);
+		if (ret)
 			goto out;
 
-		control &= ~DS1337_BIT_A1IE;
-		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
-
 		rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
 	}
 
@@ -452,14 +350,14 @@ out:
 static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 {
 	struct ds1307	*ds1307 = dev_get_drvdata(dev);
-	int		tmp;
+	int		tmp, ret;
+	const struct chip_desc *chip = &chips[ds1307->type];
 
 	/* read the RTC date and time registers all at once */
-	tmp = ds1307->read_block_data(ds1307->client,
-		ds1307->offset, 7, ds1307->regs);
-	if (tmp != 7) {
-		dev_err(dev, "%s error %d\n", "read", tmp);
-		return -EIO;
+	ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7);
+	if (ret) {
+		dev_err(dev, "%s error %d\n", "read", ret);
+		return ret;
 	}
 
 	dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
@@ -481,22 +379,9 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 	t->tm_mon = bcd2bin(tmp) - 1;
 	t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
 
-#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
-	switch (ds1307->type) {
-	case ds_1337:
-	case ds_1339:
-	case ds_3231:
-		if (ds1307->regs[DS1307_REG_MONTH] & DS1337_BIT_CENTURY)
-			t->tm_year += 100;
-		break;
-	case ds_1340:
-		if (ds1307->regs[DS1307_REG_HOUR] & DS1340_BIT_CENTURY)
-			t->tm_year += 100;
-		break;
-	default:
-		break;
-	}
-#endif
+	if (ds1307->regs[chip->century_reg] & chip->century_bit &&
+	    IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY))
+		t->tm_year += 100;
 
 	dev_dbg(dev, "%s secs=%d, mins=%d, "
 		"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
@@ -511,6 +396,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 {
 	struct ds1307	*ds1307 = dev_get_drvdata(dev);
+	const struct chip_desc *chip = &chips[ds1307->type];
 	int		result;
 	int		tmp;
 	u8		*buf = ds1307->regs;
@@ -521,24 +407,14 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 		t->tm_hour, t->tm_mday,
 		t->tm_mon, t->tm_year, t->tm_wday);
 
-#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
 	if (t->tm_year < 100)
 		return -EINVAL;
 
-	switch (ds1307->type) {
-	case ds_1337:
-	case ds_1339:
-	case ds_3231:
-	case ds_1340:
-		if (t->tm_year > 299)
-			return -EINVAL;
-	default:
-		if (t->tm_year > 199)
-			return -EINVAL;
-		break;
-	}
+#ifdef CONFIG_RTC_DRV_DS1307_CENTURY
+	if (t->tm_year > (chip->century_bit ? 299 : 199))
+		return -EINVAL;
 #else
-	if (t->tm_year < 100 || t->tm_year > 199)
+	if (t->tm_year > 199)
 		return -EINVAL;
 #endif
 
@@ -553,19 +429,12 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 	tmp = t->tm_year - 100;
 	buf[DS1307_REG_YEAR] = bin2bcd(tmp);
 
-	switch (ds1307->type) {
-	case ds_1337:
-	case ds_1339:
-	case ds_3231:
-		if (t->tm_year > 199)
-			buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
-		break;
-	case ds_1340:
-		buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN;
-		if (t->tm_year > 199)
-			buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY;
-		break;
-	case mcp794xx:
+	if (chip->century_enable_bit)
+		buf[chip->century_reg] |= chip->century_enable_bit;
+	if (t->tm_year > 199 && chip->century_bit)
+		buf[chip->century_reg] |= chip->century_bit;
+
+	if (ds1307->type == mcp794xx) {
 		/*
 		 * these bits were cleared when preparing the date/time
 		 * values and need to be set again before writing the
@@ -573,16 +442,12 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 		 */
 		buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
 		buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
-		break;
-	default:
-		break;
 	}
 
 	dev_dbg(dev, "%s: %7ph\n", "write", buf);
 
-	result = ds1307->write_block_data(ds1307->client,
-		ds1307->offset, 7, buf);
-	if (result < 0) {
+	result = regmap_bulk_write(ds1307->regmap, ds1307->offset, buf, 7);
+	if (result) {
 		dev_err(dev, "%s error %d\n", "write", result);
 		return result;
 	}
@@ -591,19 +456,18 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 
 static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client       *client = to_i2c_client(dev);
-	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	struct ds1307		*ds1307 = dev_get_drvdata(dev);
 	int			ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
 	/* read all ALARM1, ALARM2, and status registers at once */
-	ret = ds1307->read_block_data(client,
-			DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
-	if (ret != 9) {
+	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS,
+			       ds1307->regs, 9);
+	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm read", ret);
-		return -EIO;
+		return ret;
 	}
 
 	dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read",
@@ -633,8 +497,7 @@ static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client	*client = to_i2c_client(dev);
-	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	struct ds1307		*ds1307 = dev_get_drvdata(dev);
 	unsigned char		*buf = ds1307->regs;
 	u8			control, status;
 	int			ret;
@@ -649,11 +512,10 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* read current status of both alarms and the chip */
-	ret = ds1307->read_block_data(client,
-			DS1339_REG_ALARM1_SECS, 9, buf);
-	if (ret != 9) {
+	ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	if (ret) {
 		dev_err(dev, "%s error %d\n", "alarm write", ret);
-		return -EIO;
+		return ret;
 	}
 	control = ds1307->regs[7];
 	status = ds1307->regs[8];
@@ -676,9 +538,8 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
 	buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
 
-	ret = ds1307->write_block_data(client,
-			DS1339_REG_ALARM1_SECS, 9, buf);
-	if (ret < 0) {
+	ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9);
+	if (ret) {
 		dev_err(dev, "can't set alarm time\n");
 		return ret;
 	}
@@ -687,7 +548,7 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	if (t->enabled) {
 		dev_dbg(dev, "alarm IRQ armed\n");
 		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
-		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, buf[7]);
+		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, buf[7]);
 	}
 
 	return 0;
@@ -695,35 +556,181 @@ static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
-	struct i2c_client	*client = to_i2c_client(dev);
-	struct ds1307		*ds1307 = i2c_get_clientdata(client);
-	int			ret;
+	struct ds1307		*ds1307 = dev_get_drvdata(dev);
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -ENOTTY;
 
-	ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+	return regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				  DS1337_BIT_A1IE,
+				  enabled ? DS1337_BIT_A1IE : 0);
+}
+
+static const struct rtc_class_ops ds13xx_rtc_ops = {
+	.read_time	= ds1307_get_time,
+	.set_time	= ds1307_set_time,
+	.read_alarm	= ds1337_read_alarm,
+	.set_alarm	= ds1337_set_alarm,
+	.alarm_irq_enable = ds1307_alarm_irq_enable,
+};
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Alarm support for rx8130 devices.
+ */
+
+#define RX8130_REG_ALARM_MIN		0x07
+#define RX8130_REG_ALARM_HOUR		0x08
+#define RX8130_REG_ALARM_WEEK_OR_DAY	0x09
+#define RX8130_REG_EXTENSION		0x0c
+#define RX8130_REG_EXTENSION_WADA	(1 << 3)
+#define RX8130_REG_FLAG			0x0d
+#define RX8130_REG_FLAG_AF		(1 << 3)
+#define RX8130_REG_CONTROL0		0x0e
+#define RX8130_REG_CONTROL0_AIE		(1 << 3)
+
+static irqreturn_t rx8130_irq(int irq, void *dev_id)
+{
+	struct ds1307           *ds1307 = dev_id;
+	struct mutex            *lock = &ds1307->rtc->ops_lock;
+	u8 ctl[3];
+	int ret;
+
+	mutex_lock(lock);
+
+	/* Read control registers. */
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
 	if (ret < 0)
-		return ret;
+		goto out;
+	if (!(ctl[1] & RX8130_REG_FLAG_AF))
+		goto out;
+	ctl[1] &= ~RX8130_REG_FLAG_AF;
+	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
 
-	if (enabled)
-		ret |= DS1337_BIT_A1IE;
-	else
-		ret &= ~DS1337_BIT_A1IE;
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	if (ret < 0)
+		goto out;
+
+	rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
+
+out:
+	mutex_unlock(lock);
+
+	return IRQ_HANDLED;
+}
 
-	ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret);
+static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
+	u8 ald[3], ctl[3];
+	int ret;
+
+	if (!test_bit(HAS_ALARM, &ds1307->flags))
+		return -EINVAL;
+
+	/* Read alarm registers. */
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
 	if (ret < 0)
 		return ret;
 
+	/* Read control registers. */
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	if (ret < 0)
+		return ret;
+
+	t->enabled = !!(ctl[2] & RX8130_REG_CONTROL0_AIE);
+	t->pending = !!(ctl[1] & RX8130_REG_FLAG_AF);
+
+	/* Report alarm 0 time assuming 24-hour and day-of-month modes. */
+	t->time.tm_sec = -1;
+	t->time.tm_min = bcd2bin(ald[0] & 0x7f);
+	t->time.tm_hour = bcd2bin(ald[1] & 0x7f);
+	t->time.tm_wday = -1;
+	t->time.tm_mday = bcd2bin(ald[2] & 0x7f);
+	t->time.tm_mon = -1;
+	t->time.tm_year = -1;
+	t->time.tm_yday = -1;
+	t->time.tm_isdst = -1;
+
+	dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d enabled=%d\n",
+		__func__, t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
+		t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled);
+
 	return 0;
 }
 
-static const struct rtc_class_ops ds13xx_rtc_ops = {
+static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
+	u8 ald[3], ctl[3];
+	int ret;
+
+	if (!test_bit(HAS_ALARM, &ds1307->flags))
+		return -EINVAL;
+
+	dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
+		"enabled=%d pending=%d\n", __func__,
+		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
+		t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
+		t->enabled, t->pending);
+
+	/* Read control registers. */
+	ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	if (ret < 0)
+		return ret;
+
+	ctl[0] &= ~RX8130_REG_EXTENSION_WADA;
+	ctl[1] |= RX8130_REG_FLAG_AF;
+	ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
+
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+	if (ret < 0)
+		return ret;
+
+	/* Hardware alarm precision is 1 minute! */
+	ald[0] = bin2bcd(t->time.tm_min);
+	ald[1] = bin2bcd(t->time.tm_hour);
+	ald[2] = bin2bcd(t->time.tm_mday);
+
+	ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+	if (ret < 0)
+		return ret;
+
+	if (!t->enabled)
+		return 0;
+
+	ctl[2] |= RX8130_REG_CONTROL0_AIE;
+
+	return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+}
+
+static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
+	int ret, reg;
+
+	if (!test_bit(HAS_ALARM, &ds1307->flags))
+		return -EINVAL;
+
+	ret = regmap_read(ds1307->regmap, RX8130_REG_CONTROL0, &reg);
+	if (ret < 0)
+		return ret;
+
+	if (enabled)
+		reg |= RX8130_REG_CONTROL0_AIE;
+	else
+		reg &= ~RX8130_REG_CONTROL0_AIE;
+
+	return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
+}
+
+static const struct rtc_class_ops rx8130_rtc_ops = {
 	.read_time	= ds1307_get_time,
 	.set_time	= ds1307_set_time,
-	.read_alarm	= ds1337_read_alarm,
-	.set_alarm	= ds1337_set_alarm,
-	.alarm_irq_enable = ds1307_alarm_irq_enable,
+	.read_alarm	= rx8130_read_alarm,
+	.set_alarm	= rx8130_set_alarm,
+	.alarm_irq_enable = rx8130_alarm_irq_enable,
 };
 
 /*----------------------------------------------------------------------*/
@@ -752,31 +759,27 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
 
 static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
 {
-	struct i2c_client       *client = dev_id;
-	struct ds1307           *ds1307 = i2c_get_clientdata(client);
+	struct ds1307           *ds1307 = dev_id;
 	struct mutex            *lock = &ds1307->rtc->ops_lock;
 	int reg, ret;
 
 	mutex_lock(lock);
 
 	/* Check and clear alarm 0 interrupt flag. */
-	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL);
-	if (reg < 0)
+	ret = regmap_read(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, &reg);
+	if (ret)
 		goto out;
 	if (!(reg & MCP794XX_BIT_ALMX_IF))
 		goto out;
 	reg &= ~MCP794XX_BIT_ALMX_IF;
-	ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_ALARM0_CTRL, reg);
-	if (ret < 0)
+	ret = regmap_write(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, reg);
+	if (ret)
 		goto out;
 
 	/* Disable alarm 0. */
-	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
-	if (reg < 0)
-		goto out;
-	reg &= ~MCP794XX_BIT_ALM0_EN;
-	ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
-	if (ret < 0)
+	ret = regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				 MCP794XX_BIT_ALM0_EN, 0);
+	if (ret)
 		goto out;
 
 	rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
@@ -789,8 +792,7 @@ out:
 
 static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct ds1307 *ds1307 = i2c_get_clientdata(client);
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
 	u8 *regs = ds1307->regs;
 	int ret;
 
@@ -798,8 +800,8 @@ static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 		return -EINVAL;
 
 	/* Read control and alarm 0 registers. */
-	ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
-	if (ret < 0)
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	if (ret)
 		return ret;
 
 	t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
@@ -828,8 +830,7 @@ static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct ds1307 *ds1307 = i2c_get_clientdata(client);
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
 	unsigned char *regs = ds1307->regs;
 	int ret;
 
@@ -843,8 +844,8 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 		t->enabled, t->pending);
 
 	/* Read control and alarm 0 registers. */
-	ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
-	if (ret < 0)
+	ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	if (ret)
 		return ret;
 
 	/* Set alarm 0, using 24-hour and day-of-month modes. */
@@ -862,35 +863,26 @@ static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	/* Disable interrupt. We will not enable until completely programmed */
 	regs[0] &= ~MCP794XX_BIT_ALM0_EN;
 
-	ret = ds1307->write_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
-	if (ret < 0)
+	ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10);
+	if (ret)
 		return ret;
 
 	if (!t->enabled)
 		return 0;
 	regs[0] |= MCP794XX_BIT_ALM0_EN;
-	return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, regs[0]);
+	return regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs[0]);
 }
 
 static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct ds1307 *ds1307 = i2c_get_clientdata(client);
-	int reg;
+	struct ds1307 *ds1307 = dev_get_drvdata(dev);
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
-	reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
-	if (reg < 0)
-		return reg;
-
-	if (enabled)
-		reg |= MCP794XX_BIT_ALM0_EN;
-	else
-		reg &= ~MCP794XX_BIT_ALM0_EN;
-
-	return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
+	return regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				  MCP794XX_BIT_ALM0_EN,
+				  enabled ? MCP794XX_BIT_ALM0_EN : 0);
 }
 
 static const struct rtc_class_ops mcp794xx_rtc_ops = {
@@ -903,50 +895,27 @@ static const struct rtc_class_ops mcp794xx_rtc_ops = {
 
 /*----------------------------------------------------------------------*/
 
-static ssize_t
-ds1307_nvram_read(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr,
-		char *buf, loff_t off, size_t count)
+static int ds1307_nvram_read(void *priv, unsigned int offset, void *val,
+			     size_t bytes)
 {
-	struct i2c_client	*client;
-	struct ds1307		*ds1307;
-	int			result;
+	struct ds1307 *ds1307 = priv;
 
-	client = kobj_to_i2c_client(kobj);
-	ds1307 = i2c_get_clientdata(client);
-
-	result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
-								count, buf);
-	if (result < 0)
-		dev_err(&client->dev, "%s error %d\n", "nvram read", result);
-	return result;
+	return regmap_bulk_read(ds1307->regmap, ds1307->nvram_offset + offset,
+				val, bytes);
 }
 
-static ssize_t
-ds1307_nvram_write(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr,
-		char *buf, loff_t off, size_t count)
+static int ds1307_nvram_write(void *priv, unsigned int offset, void *val,
+			      size_t bytes)
 {
-	struct i2c_client	*client;
-	struct ds1307		*ds1307;
-	int			result;
+	struct ds1307 *ds1307 = priv;
 
-	client = kobj_to_i2c_client(kobj);
-	ds1307 = i2c_get_clientdata(client);
-
-	result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
-								count, buf);
-	if (result < 0) {
-		dev_err(&client->dev, "%s error %d\n", "nvram write", result);
-		return result;
-	}
-	return count;
+	return regmap_bulk_write(ds1307->regmap, ds1307->nvram_offset + offset,
+				 val, bytes);
 }
 
-
 /*----------------------------------------------------------------------*/
 
-static u8 do_trickle_setup_ds1339(struct i2c_client *client,
+static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307,
 				  uint32_t ohms, bool diode)
 {
 	u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
@@ -963,14 +932,14 @@ static u8 do_trickle_setup_ds1339(struct i2c_client *client,
 		setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
 		break;
 	default:
-		dev_warn(&client->dev,
+		dev_warn(ds1307->dev,
 			 "Unsupported ohm value %u in dt\n", ohms);
 		return 0;
 	}
 	return setup;
 }
 
-static void ds1307_trickle_init(struct i2c_client *client,
+static void ds1307_trickle_init(struct ds1307 *ds1307,
 				struct chip_desc *chip)
 {
 	uint32_t ohms = 0;
@@ -978,11 +947,12 @@ static void ds1307_trickle_init(struct i2c_client *client,
 
 	if (!chip->do_trickle_setup)
 		goto out;
-	if (device_property_read_u32(&client->dev, "trickle-resistor-ohms", &ohms))
+	if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms",
+				     &ohms))
 		goto out;
-	if (device_property_read_bool(&client->dev, "trickle-diode-disable"))
+	if (device_property_read_bool(ds1307->dev, "trickle-diode-disable"))
 		diode = false;
-	chip->trickle_charger_setup = chip->do_trickle_setup(client,
+	chip->trickle_charger_setup = chip->do_trickle_setup(ds1307,
 							     ohms, diode);
 out:
 	return;
@@ -1009,13 +979,10 @@ static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC)
 	s16 temp;
 	int ret;
 
-	ret = ds1307->read_block_data(ds1307->client, DS3231_REG_TEMPERATURE,
-					sizeof(temp_buf), temp_buf);
-	if (ret < 0)
+	ret = regmap_bulk_read(ds1307->regmap, DS3231_REG_TEMPERATURE,
+			       temp_buf, sizeof(temp_buf));
+	if (ret)
 		return ret;
-	if (ret != sizeof(temp_buf))
-		return -EIO;
-
 	/*
 	 * Temperature is represented as a 10-bit code with a resolution of
 	 * 0.25 degree celsius and encoded in two's complement format.
@@ -1055,12 +1022,11 @@ static void ds1307_hwmon_register(struct ds1307 *ds1307)
 	if (ds1307->type != ds_3231)
 		return;
 
-	dev = devm_hwmon_device_register_with_groups(&ds1307->client->dev,
-						ds1307->client->name,
+	dev = devm_hwmon_device_register_with_groups(ds1307->dev, ds1307->name,
 						ds1307, ds3231_hwmon_groups);
 	if (IS_ERR(dev)) {
-		dev_warn(&ds1307->client->dev,
-			"unable to register hwmon device %ld\n", PTR_ERR(dev));
+		dev_warn(ds1307->dev, "unable to register hwmon device %ld\n",
+			 PTR_ERR(dev));
 	}
 }
 
@@ -1099,24 +1065,12 @@ static int ds3231_clk_sqw_rates[] = {
 
 static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value)
 {
-	struct i2c_client *client = ds1307->client;
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int control;
 	int ret;
 
 	mutex_lock(lock);
-
-	control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
-	if (control < 0) {
-		ret = control;
-		goto out;
-	}
-
-	control &= ~mask;
-	control |= value;
-
-	ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				 mask, value);
 	mutex_unlock(lock);
 
 	return ret;
@@ -1126,12 +1080,12 @@ static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw,
 						unsigned long parent_rate)
 {
 	struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
-	int control;
+	int control, ret;
 	int rate_sel = 0;
 
-	control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL);
-	if (control < 0)
-		return control;
+	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
+	if (ret)
+		return ret;
 	if (control & DS1337_BIT_RS1)
 		rate_sel += 1;
 	if (control & DS1337_BIT_RS2)
@@ -1195,11 +1149,11 @@ static void ds3231_clk_sqw_unprepare(struct clk_hw *hw)
 static int ds3231_clk_sqw_is_prepared(struct clk_hw *hw)
 {
 	struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
-	int control;
+	int control, ret;
 
-	control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL);
-	if (control < 0)
-		return control;
+	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
+	if (ret)
+		return ret;
 
 	return !(control & DS1337_BIT_INTCN);
 }
@@ -1221,26 +1175,13 @@ static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw,
 
 static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable)
 {
-	struct i2c_client *client = ds1307->client;
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int status;
 	int ret;
 
 	mutex_lock(lock);
-
-	status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
-	if (status < 0) {
-		ret = status;
-		goto out;
-	}
-
-	if (enable)
-		status |= DS3231_BIT_EN32KHZ;
-	else
-		status &= ~DS3231_BIT_EN32KHZ;
-
-	ret = i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, status);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_STATUS,
+				 DS3231_BIT_EN32KHZ,
+				 enable ? DS3231_BIT_EN32KHZ : 0);
 	mutex_unlock(lock);
 
 	return ret;
@@ -1263,11 +1204,11 @@ static void ds3231_clk_32khz_unprepare(struct clk_hw *hw)
 static int ds3231_clk_32khz_is_prepared(struct clk_hw *hw)
 {
 	struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw);
-	int status;
+	int status, ret;
 
-	status = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_STATUS);
-	if (status < 0)
-		return status;
+	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &status);
+	if (ret)
+		return ret;
 
 	return !!(status & DS3231_BIT_EN32KHZ);
 }
@@ -1292,18 +1233,17 @@ static struct clk_init_data ds3231_clks_init[] = {
 
 static int ds3231_clks_register(struct ds1307 *ds1307)
 {
-	struct i2c_client *client = ds1307->client;
-	struct device_node *node = client->dev.of_node;
+	struct device_node *node = ds1307->dev->of_node;
 	struct clk_onecell_data	*onecell;
 	int i;
 
-	onecell = devm_kzalloc(&client->dev, sizeof(*onecell), GFP_KERNEL);
+	onecell = devm_kzalloc(ds1307->dev, sizeof(*onecell), GFP_KERNEL);
 	if (!onecell)
 		return -ENOMEM;
 
 	onecell->clk_num = ARRAY_SIZE(ds3231_clks_init);
-	onecell->clks = devm_kcalloc(&client->dev, onecell->clk_num,
-					sizeof(onecell->clks[0]), GFP_KERNEL);
+	onecell->clks = devm_kcalloc(ds1307->dev, onecell->clk_num,
+				     sizeof(onecell->clks[0]), GFP_KERNEL);
 	if (!onecell->clks)
 		return -ENOMEM;
 
@@ -1322,8 +1262,8 @@ static int ds3231_clks_register(struct ds1307 *ds1307)
 						&init.name);
 		ds1307->clks[i].init = &init;
 
-		onecell->clks[i] = devm_clk_register(&client->dev,
-							&ds1307->clks[i]);
+		onecell->clks[i] = devm_clk_register(ds1307->dev,
+						     &ds1307->clks[i]);
 		if (IS_ERR(onecell->clks[i]))
 			return PTR_ERR(onecell->clks[i]);
 	}
@@ -1345,8 +1285,8 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
 
 	ret = ds3231_clks_register(ds1307);
 	if (ret) {
-		dev_warn(&ds1307->client->dev,
-			"unable to register clock device %d\n", ret);
+		dev_warn(ds1307->dev, "unable to register clock device %d\n",
+			 ret);
 	}
 }
 
@@ -1358,6 +1298,12 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
 
 #endif /* CONFIG_COMMON_CLK */
 
+static const struct regmap_config regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x12,
+};
+
 static int ds1307_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
@@ -1365,7 +1311,6 @@ static int ds1307_probe(struct i2c_client *client,
 	int			err = -ENODEV;
 	int			tmp, wday;
 	struct chip_desc	*chip;
-	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);
 	bool			want_irq = false;
 	bool			ds1307_can_wakeup_device = false;
 	unsigned char		*buf;
@@ -1382,17 +1327,22 @@ static int ds1307_probe(struct i2c_client *client,
 	};
 	const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
 
-	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
-	    && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
-		return -EIO;
-
 	ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
 	if (!ds1307)
 		return -ENOMEM;
 
-	i2c_set_clientdata(client, ds1307);
+	dev_set_drvdata(&client->dev, ds1307);
+	ds1307->dev = &client->dev;
+	ds1307->name = client->name;
+	ds1307->irq = client->irq;
 
-	ds1307->client	= client;
+	ds1307->regmap = devm_regmap_init_i2c(client, &regmap_config);
+	if (IS_ERR(ds1307->regmap)) {
+		dev_err(ds1307->dev, "regmap allocation failed\n");
+		return PTR_ERR(ds1307->regmap);
+	}
+
+	i2c_set_clientdata(client, ds1307);
 
 	if (client->dev.of_node) {
 		ds1307->type = (enum ds_type)
@@ -1405,7 +1355,7 @@ static int ds1307_probe(struct i2c_client *client,
 		const struct acpi_device_id *acpi_id;
 
 		acpi_id = acpi_match_device(ACPI_PTR(ds1307_acpi_ids),
-					    &client->dev);
+					    ds1307->dev);
 		if (!acpi_id)
 			return -ENODEV;
 		chip = &chips[acpi_id->driver_data];
@@ -1413,27 +1363,21 @@ static int ds1307_probe(struct i2c_client *client,
 	}
 
 	if (!pdata)
-		ds1307_trickle_init(client, chip);
+		ds1307_trickle_init(ds1307, chip);
 	else if (pdata->trickle_charger_setup)
 		chip->trickle_charger_setup = pdata->trickle_charger_setup;
 
 	if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
-		dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n",
+		dev_dbg(ds1307->dev,
+			"writing trickle charger info 0x%x to 0x%x\n",
 		    DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
 		    chip->trickle_charger_reg);
-		i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
+		regmap_write(ds1307->regmap, chip->trickle_charger_reg,
 		    DS13XX_TRICKLE_CHARGER_MAGIC |
 		    chip->trickle_charger_setup);
 	}
 
 	buf = ds1307->regs;
-	if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
-		ds1307->read_block_data = ds1307_native_smbus_read_block_data;
-		ds1307->write_block_data = ds1307_native_smbus_write_block_data;
-	} else {
-		ds1307->read_block_data = ds1307_read_block_data;
-		ds1307->write_block_data = ds1307_write_block_data;
-	}
 
 #ifdef CONFIG_OF
 /*
@@ -1459,11 +1403,10 @@ static int ds1307_probe(struct i2c_client *client,
 	case ds_1339:
 	case ds_3231:
 		/* get registers that the "rtc" read below won't read... */
-		tmp = ds1307->read_block_data(ds1307->client,
-				DS1337_REG_CONTROL, 2, buf);
-		if (tmp != 2) {
-			dev_dbg(&client->dev, "read error %d\n", tmp);
-			err = -EIO;
+		err = regmap_bulk_read(ds1307->regmap, DS1337_REG_CONTROL,
+				       buf, 2);
+		if (err) {
+			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
@@ -1477,8 +1420,8 @@ static int ds1307_probe(struct i2c_client *client,
 		 * For some variants, be sure alarms can trigger when we're
 		 * running on Vbackup (BBSQI/BBSQW)
 		 */
-		if (chip->alarm && (ds1307->client->irq > 0 ||
-						ds1307_can_wakeup_device)) {
+		if (chip->alarm && (ds1307->irq > 0 ||
+				    ds1307_can_wakeup_device)) {
 			ds1307->regs[0] |= DS1337_BIT_INTCN
 					| bbsqi_bitpos[ds1307->type];
 			ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
@@ -1486,50 +1429,49 @@ static int ds1307_probe(struct i2c_client *client,
 			want_irq = true;
 		}
 
-		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
-							ds1307->regs[0]);
+		regmap_write(ds1307->regmap, DS1337_REG_CONTROL,
+			     ds1307->regs[0]);
 
 		/* oscillator fault?  clear flag, and warn */
 		if (ds1307->regs[1] & DS1337_BIT_OSF) {
-			i2c_smbus_write_byte_data(client, DS1337_REG_STATUS,
-				ds1307->regs[1] & ~DS1337_BIT_OSF);
-			dev_warn(&client->dev, "SET TIME!\n");
+			regmap_write(ds1307->regmap, DS1337_REG_STATUS,
+				     ds1307->regs[1] & ~DS1337_BIT_OSF);
+			dev_warn(ds1307->dev, "SET TIME!\n");
 		}
 		break;
 
 	case rx_8025:
-		tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
-				RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
-		if (tmp != 2) {
-			dev_dbg(&client->dev, "read error %d\n", tmp);
-			err = -EIO;
+		err = regmap_bulk_read(ds1307->regmap,
+				       RX8025_REG_CTRL1 << 4 | 0x08, buf, 2);
+		if (err) {
+			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator off?  turn it on, so clock can tick. */
 		if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
 			ds1307->regs[1] |= RX8025_BIT_XST;
-			i2c_smbus_write_byte_data(client,
-						  RX8025_REG_CTRL2 << 4 | 0x08,
-						  ds1307->regs[1]);
-			dev_warn(&client->dev,
+			regmap_write(ds1307->regmap,
+				     RX8025_REG_CTRL2 << 4 | 0x08,
+				     ds1307->regs[1]);
+			dev_warn(ds1307->dev,
 				 "oscillator stop detected - SET TIME!\n");
 		}
 
 		if (ds1307->regs[1] & RX8025_BIT_PON) {
 			ds1307->regs[1] &= ~RX8025_BIT_PON;
-			i2c_smbus_write_byte_data(client,
-						  RX8025_REG_CTRL2 << 4 | 0x08,
-						  ds1307->regs[1]);
-			dev_warn(&client->dev, "power-on detected\n");
+			regmap_write(ds1307->regmap,
+				     RX8025_REG_CTRL2 << 4 | 0x08,
+				     ds1307->regs[1]);
+			dev_warn(ds1307->dev, "power-on detected\n");
 		}
 
 		if (ds1307->regs[1] & RX8025_BIT_VDET) {
 			ds1307->regs[1] &= ~RX8025_BIT_VDET;
-			i2c_smbus_write_byte_data(client,
-						  RX8025_REG_CTRL2 << 4 | 0x08,
-						  ds1307->regs[1]);
-			dev_warn(&client->dev, "voltage drop detected\n");
+			regmap_write(ds1307->regmap,
+				     RX8025_REG_CTRL2 << 4 | 0x08,
+				     ds1307->regs[1]);
+			dev_warn(ds1307->dev, "voltage drop detected\n");
 		}
 
 		/* make sure we are running in 24hour mode */
@@ -1537,16 +1479,15 @@ static int ds1307_probe(struct i2c_client *client,
 			u8 hour;
 
 			/* switch to 24 hour mode */
-			i2c_smbus_write_byte_data(client,
-						  RX8025_REG_CTRL1 << 4 | 0x08,
-						  ds1307->regs[0] |
-						  RX8025_BIT_2412);
-
-			tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
-					RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
-			if (tmp != 2) {
-				dev_dbg(&client->dev, "read error %d\n", tmp);
-				err = -EIO;
+			regmap_write(ds1307->regmap,
+				     RX8025_REG_CTRL1 << 4 | 0x08,
+				     ds1307->regs[0] | RX8025_BIT_2412);
+
+			err = regmap_bulk_read(ds1307->regmap,
+					       RX8025_REG_CTRL1 << 4 | 0x08,
+					       buf, 2);
+			if (err) {
+				dev_dbg(ds1307->dev, "read error %d\n", err);
 				goto exit;
 			}
 
@@ -1557,9 +1498,16 @@ static int ds1307_probe(struct i2c_client *client,
 			if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 				hour += 12;
 
-			i2c_smbus_write_byte_data(client,
-						  DS1307_REG_HOUR << 4 | 0x08,
-						  hour);
+			regmap_write(ds1307->regmap,
+				     DS1307_REG_HOUR << 4 | 0x08, hour);
+		}
+		break;
+	case rx_8130:
+		ds1307->offset = 0x10; /* Seconds starts at 0x10 */
+		rtc_ops = &rx8130_rtc_ops;
+		if (chip->alarm && ds1307->irq > 0) {
+			irq_handler = rx8130_irq;
+			want_irq = true;
 		}
 		break;
 	case ds_1388:
@@ -1567,7 +1515,8 @@ static int ds1307_probe(struct i2c_client *client,
 		break;
 	case mcp794xx:
 		rtc_ops = &mcp794xx_rtc_ops;
-		if (ds1307->client->irq > 0 && chip->alarm) {
+		if (chip->alarm && (ds1307->irq > 0 ||
+				    ds1307_can_wakeup_device)) {
 			irq_handler = mcp794xx_irq;
 			want_irq = true;
 		}
@@ -1578,10 +1527,9 @@ static int ds1307_probe(struct i2c_client *client,
 
 read_rtc:
 	/* read RTC registers */
-	tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
-	if (tmp != 8) {
-		dev_dbg(&client->dev, "read error %d\n", tmp);
-		err = -EIO;
+	err = regmap_bulk_read(ds1307->regmap, ds1307->offset, buf, 8);
+	if (err) {
+		dev_dbg(ds1307->dev, "read error %d\n", err);
 		goto exit;
 	}
 
@@ -1597,56 +1545,56 @@ read_rtc:
 	case m41t00:
 		/* clock halted?  turn it on, so clock can tick. */
 		if (tmp & DS1307_BIT_CH) {
-			i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
-			dev_warn(&client->dev, "SET TIME!\n");
+			regmap_write(ds1307->regmap, DS1307_REG_SECS, 0);
+			dev_warn(ds1307->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
 		break;
+	case ds_1308:
 	case ds_1338:
 		/* clock halted?  turn it on, so clock can tick. */
 		if (tmp & DS1307_BIT_CH)
-			i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
+			regmap_write(ds1307->regmap, DS1307_REG_SECS, 0);
 
 		/* oscillator fault?  clear flag, and warn */
 		if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
-			i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL,
-					ds1307->regs[DS1307_REG_CONTROL]
-					& ~DS1338_BIT_OSF);
-			dev_warn(&client->dev, "SET TIME!\n");
+			regmap_write(ds1307->regmap, DS1307_REG_CONTROL,
+					ds1307->regs[DS1307_REG_CONTROL] &
+					~DS1338_BIT_OSF);
+			dev_warn(ds1307->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
 		break;
 	case ds_1340:
 		/* clock halted?  turn it on, so clock can tick. */
 		if (tmp & DS1340_BIT_nEOSC)
-			i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
+			regmap_write(ds1307->regmap, DS1307_REG_SECS, 0);
 
-		tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
-		if (tmp < 0) {
-			dev_dbg(&client->dev, "read error %d\n", tmp);
-			err = -EIO;
+		err = regmap_read(ds1307->regmap, DS1340_REG_FLAG, &tmp);
+		if (err) {
+			dev_dbg(ds1307->dev, "read error %d\n", err);
 			goto exit;
 		}
 
 		/* oscillator fault?  clear flag, and warn */
 		if (tmp & DS1340_BIT_OSF) {
-			i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
-			dev_warn(&client->dev, "SET TIME!\n");
+			regmap_write(ds1307->regmap, DS1340_REG_FLAG, 0);
+			dev_warn(ds1307->dev, "SET TIME!\n");
 		}
 		break;
 	case mcp794xx:
 		/* make sure that the backup battery is enabled */
 		if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
-			i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
-					ds1307->regs[DS1307_REG_WDAY]
-					| MCP794XX_BIT_VBATEN);
+			regmap_write(ds1307->regmap, DS1307_REG_WDAY,
+				     ds1307->regs[DS1307_REG_WDAY] |
+				     MCP794XX_BIT_VBATEN);
 		}
 
 		/* clock halted?  turn it on, so clock can tick. */
 		if (!(tmp & MCP794XX_BIT_ST)) {
-			i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
-					MCP794XX_BIT_ST);
-			dev_warn(&client->dev, "SET TIME!\n");
+			regmap_write(ds1307->regmap, DS1307_REG_SECS,
+				     MCP794XX_BIT_ST);
+			dev_warn(ds1307->dev, "SET TIME!\n");
 			goto read_rtc;
 		}
 
@@ -1680,16 +1628,15 @@ read_rtc:
 			tmp = 0;
 		if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
 			tmp += 12;
-		i2c_smbus_write_byte_data(client,
-				ds1307->offset + DS1307_REG_HOUR,
-				bin2bcd(tmp));
+		regmap_write(ds1307->regmap, ds1307->offset + DS1307_REG_HOUR,
+			     bin2bcd(tmp));
 	}
 
 	/*
 	 * Some IPs have weekday reset value = 0x1 which might not correct
 	 * hence compute the wday using the current date/month/year values
 	 */
-	ds1307_get_time(&client->dev, &tm);
+	ds1307_get_time(ds1307->dev, &tm);
 	wday = tm.tm_wday;
 	timestamp = rtc_tm_to_time64(&tm);
 	rtc_time64_to_tm(timestamp, &tm);
@@ -1699,78 +1646,63 @@ read_rtc:
 	 * If different then set the wday which we computed using
 	 * timestamp
 	 */
-	if (wday != tm.tm_wday) {
-		wday = i2c_smbus_read_byte_data(client, MCP794XX_REG_WEEKDAY);
-		wday = wday & ~MCP794XX_REG_WEEKDAY_WDAY_MASK;
-		wday = wday | (tm.tm_wday + 1);
-		i2c_smbus_write_byte_data(client, MCP794XX_REG_WEEKDAY, wday);
-	}
+	if (wday != tm.tm_wday)
+		regmap_update_bits(ds1307->regmap, MCP794XX_REG_WEEKDAY,
+				   MCP794XX_REG_WEEKDAY_WDAY_MASK,
+				   tm.tm_wday + 1);
 
 	if (want_irq) {
-		device_set_wakeup_capable(&client->dev, true);
+		device_set_wakeup_capable(ds1307->dev, true);
 		set_bit(HAS_ALARM, &ds1307->flags);
 	}
-	ds1307->rtc = devm_rtc_device_register(&client->dev, client->name,
-				rtc_ops, THIS_MODULE);
+
+	ds1307->rtc = devm_rtc_allocate_device(ds1307->dev);
 	if (IS_ERR(ds1307->rtc)) {
 		return PTR_ERR(ds1307->rtc);
 	}
 
-	if (ds1307_can_wakeup_device && ds1307->client->irq <= 0) {
+	if (ds1307_can_wakeup_device && ds1307->irq <= 0) {
 		/* Disable request for an IRQ */
 		want_irq = false;
-		dev_info(&client->dev, "'wakeup-source' is set, request for an IRQ is disabled!\n");
+		dev_info(ds1307->dev,
+			 "'wakeup-source' is set, request for an IRQ is disabled!\n");
 		/* We cannot support UIE mode if we do not have an IRQ line */
 		ds1307->rtc->uie_unsupported = 1;
 	}
 
 	if (want_irq) {
-		err = devm_request_threaded_irq(&client->dev,
-						client->irq, NULL, irq_handler,
+		err = devm_request_threaded_irq(ds1307->dev,
+						ds1307->irq, NULL, irq_handler,
 						IRQF_SHARED | IRQF_ONESHOT,
-						ds1307->rtc->name, client);
+						ds1307->name, ds1307);
 		if (err) {
 			client->irq = 0;
-			device_set_wakeup_capable(&client->dev, false);
+			device_set_wakeup_capable(ds1307->dev, false);
 			clear_bit(HAS_ALARM, &ds1307->flags);
-			dev_err(&client->dev, "unable to request IRQ!\n");
+			dev_err(ds1307->dev, "unable to request IRQ!\n");
 		} else
-			dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
+			dev_dbg(ds1307->dev, "got IRQ %d\n", client->irq);
 	}
 
 	if (chip->nvram_size) {
-
-		ds1307->nvram = devm_kzalloc(&client->dev,
-					sizeof(struct bin_attribute),
-					GFP_KERNEL);
-		if (!ds1307->nvram) {
-			dev_err(&client->dev, "cannot allocate memory for nvram sysfs\n");
-		} else {
-
-			ds1307->nvram->attr.name = "nvram";
-			ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR;
-
-			sysfs_bin_attr_init(ds1307->nvram);
-
-			ds1307->nvram->read = ds1307_nvram_read;
-			ds1307->nvram->write = ds1307_nvram_write;
-			ds1307->nvram->size = chip->nvram_size;
-			ds1307->nvram_offset = chip->nvram_offset;
-
-			err = sysfs_create_bin_file(&client->dev.kobj,
-						    ds1307->nvram);
-			if (err) {
-				dev_err(&client->dev,
-					"unable to create sysfs file: %s\n",
-					ds1307->nvram->attr.name);
-			} else {
-				set_bit(HAS_NVRAM, &ds1307->flags);
-				dev_info(&client->dev, "%zu bytes nvram\n",
-					 ds1307->nvram->size);
-			}
-		}
+		ds1307->nvmem_cfg.name = "ds1307_nvram";
+		ds1307->nvmem_cfg.word_size = 1;
+		ds1307->nvmem_cfg.stride = 1;
+		ds1307->nvmem_cfg.size = chip->nvram_size;
+		ds1307->nvmem_cfg.reg_read = ds1307_nvram_read;
+		ds1307->nvmem_cfg.reg_write = ds1307_nvram_write;
+		ds1307->nvmem_cfg.priv = ds1307;
+		ds1307->nvram_offset = chip->nvram_offset;
+
+		ds1307->rtc->nvmem_config = &ds1307->nvmem_cfg;
+		ds1307->rtc->nvram_old_abi = true;
 	}
 
+	ds1307->rtc->ops = rtc_ops;
+	err = rtc_register_device(ds1307->rtc);
+	if (err)
+		return err;
+
 	ds1307_hwmon_register(ds1307);
 	ds1307_clks_register(ds1307);
 
@@ -1780,16 +1712,6 @@ exit:
 	return err;
 }
 
-static int ds1307_remove(struct i2c_client *client)
-{
-	struct ds1307 *ds1307 = i2c_get_clientdata(client);
-
-	if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags))
-		sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);
-
-	return 0;
-}
-
 static struct i2c_driver ds1307_driver = {
 	.driver = {
 		.name	= "rtc-ds1307",
@@ -1797,7 +1719,6 @@ static struct i2c_driver ds1307_driver = {
 		.acpi_match_table = ACPI_PTR(ds1307_acpi_ids),
 	},
 	.probe		= ds1307_probe,
-	.remove		= ds1307_remove,
 	.id_table	= ds1307_id,
 };
 
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index deff431a37c4..0550f7ba464f 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -22,6 +22,7 @@
 #include <linux/bcd.h>
 #include <linux/slab.h>
 #include <linux/regmap.h>
+#include <linux/hwmon.h>
 
 #define DS3232_REG_SECONDS      0x00
 #define DS3232_REG_MINUTES      0x01
@@ -46,6 +47,8 @@
 #       define DS3232_REG_SR_A2F     0x02
 #       define DS3232_REG_SR_A1F     0x01
 
+#define DS3232_REG_TEMPERATURE	0x11
+
 struct ds3232 {
 	struct device *dev;
 	struct regmap *regmap;
@@ -275,6 +278,120 @@ static int ds3232_update_alarm(struct device *dev, unsigned int enabled)
 	return ret;
 }
 
+/*
+ * Temperature sensor support for ds3232/ds3234 devices.
+ * A user-initiated temperature conversion is not started by this function,
+ * so the temperature is updated once every 64 seconds.
+ */
+static int ds3232_hwmon_read_temp(struct device *dev, long int *mC)
+{
+	struct ds3232 *ds3232 = dev_get_drvdata(dev);
+	u8 temp_buf[2];
+	s16 temp;
+	int ret;
+
+	ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf,
+			       sizeof(temp_buf));
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Temperature is represented as a 10-bit code with a resolution of
+	 * 0.25 degree celsius and encoded in two's complement format.
+	 */
+	temp = (temp_buf[0] << 8) | temp_buf[1];
+	temp >>= 6;
+	*mC = temp * 250;
+
+	return 0;
+}
+
+static umode_t ds3232_hwmon_is_visible(const void *data,
+				       enum hwmon_sensor_types type,
+				       u32 attr, int channel)
+{
+	if (type != hwmon_temp)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static int ds3232_hwmon_read(struct device *dev,
+			     enum hwmon_sensor_types type,
+			     u32 attr, int channel, long *temp)
+{
+	int err;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		err = ds3232_hwmon_read_temp(dev, temp);
+		break;
+	default:
+		err = -EOPNOTSUPP;
+		break;
+	}
+
+	return err;
+}
+
+static u32 ds3232_hwmon_chip_config[] = {
+	HWMON_C_REGISTER_TZ,
+	0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_chip = {
+	.type = hwmon_chip,
+	.config = ds3232_hwmon_chip_config,
+};
+
+static u32 ds3232_hwmon_temp_config[] = {
+	HWMON_T_INPUT,
+	0
+};
+
+static const struct hwmon_channel_info ds3232_hwmon_temp = {
+	.type = hwmon_temp,
+	.config = ds3232_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *ds3232_hwmon_info[] = {
+	&ds3232_hwmon_chip,
+	&ds3232_hwmon_temp,
+	NULL
+};
+
+static const struct hwmon_ops ds3232_hwmon_hwmon_ops = {
+	.is_visible = ds3232_hwmon_is_visible,
+	.read = ds3232_hwmon_read,
+};
+
+static const struct hwmon_chip_info ds3232_hwmon_chip_info = {
+	.ops = &ds3232_hwmon_hwmon_ops,
+	.info = ds3232_hwmon_info,
+};
+
+static void ds3232_hwmon_register(struct device *dev, const char *name)
+{
+	struct ds3232 *ds3232 = dev_get_drvdata(dev);
+	struct device *hwmon_dev;
+
+	if (!IS_ENABLED(CONFIG_RTC_DRV_DS3232_HWMON))
+		return;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, name, ds3232,
+							&ds3232_hwmon_chip_info,
+							NULL);
+	if (IS_ERR(hwmon_dev)) {
+		dev_err(dev, "unable to register hwmon device %ld\n",
+			PTR_ERR(hwmon_dev));
+	}
+}
+
 static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct ds3232 *ds3232 = dev_get_drvdata(dev);
@@ -366,6 +483,8 @@ static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
 	if (ds3232->irq > 0)
 		device_init_wakeup(dev, 1);
 
+	ds3232_hwmon_register(dev, name);
+
 	ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
 						THIS_MODULE);
 	if (IS_ERR(ds3232->rtc))
diff --git a/drivers/rtc/rtc-gemini.c b/drivers/rtc/rtc-ftrtc010.c
index 5279390bb42d..af8d6beae20c 100644
--- a/drivers/rtc/rtc-gemini.c
+++ b/drivers/rtc/rtc-ftrtc010.c
@@ -1,5 +1,5 @@
 /*
- *  Gemini OnChip RTC
+ *  Faraday Technology FTRTC010 driver
  *
  *  Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>
  *
@@ -26,33 +26,36 @@
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/clk.h>
 
-#define DRV_NAME        "rtc-gemini"
+#define DRV_NAME        "rtc-ftrtc010"
 
 MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>");
 MODULE_DESCRIPTION("RTC driver for Gemini SoC");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DRV_NAME);
 
-struct gemini_rtc {
+struct ftrtc010_rtc {
 	struct rtc_device	*rtc_dev;
 	void __iomem		*rtc_base;
 	int			rtc_irq;
+	struct clk		*pclk;
+	struct clk		*extclk;
 };
 
-enum gemini_rtc_offsets {
-	GEMINI_RTC_SECOND	= 0x00,
-	GEMINI_RTC_MINUTE	= 0x04,
-	GEMINI_RTC_HOUR		= 0x08,
-	GEMINI_RTC_DAYS		= 0x0C,
-	GEMINI_RTC_ALARM_SECOND	= 0x10,
-	GEMINI_RTC_ALARM_MINUTE	= 0x14,
-	GEMINI_RTC_ALARM_HOUR	= 0x18,
-	GEMINI_RTC_RECORD	= 0x1C,
-	GEMINI_RTC_CR		= 0x20
+enum ftrtc010_rtc_offsets {
+	FTRTC010_RTC_SECOND		= 0x00,
+	FTRTC010_RTC_MINUTE		= 0x04,
+	FTRTC010_RTC_HOUR		= 0x08,
+	FTRTC010_RTC_DAYS		= 0x0C,
+	FTRTC010_RTC_ALARM_SECOND	= 0x10,
+	FTRTC010_RTC_ALARM_MINUTE	= 0x14,
+	FTRTC010_RTC_ALARM_HOUR		= 0x18,
+	FTRTC010_RTC_RECORD		= 0x1C,
+	FTRTC010_RTC_CR			= 0x20,
 };
 
-static irqreturn_t gemini_rtc_interrupt(int irq, void *dev)
+static irqreturn_t ftrtc010_rtc_interrupt(int irq, void *dev)
 {
 	return IRQ_HANDLED;
 }
@@ -66,18 +69,18 @@ static irqreturn_t gemini_rtc_interrupt(int irq, void *dev)
  * the same thing, without the rtc-lib.c calls.
  */
 
-static int gemini_rtc_read_time(struct device *dev, struct rtc_time *tm)
+static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-	struct gemini_rtc *rtc = dev_get_drvdata(dev);
+	struct ftrtc010_rtc *rtc = dev_get_drvdata(dev);
 
 	unsigned int  days, hour, min, sec;
 	unsigned long offset, time;
 
-	sec  = readl(rtc->rtc_base + GEMINI_RTC_SECOND);
-	min  = readl(rtc->rtc_base + GEMINI_RTC_MINUTE);
-	hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR);
-	days = readl(rtc->rtc_base + GEMINI_RTC_DAYS);
-	offset = readl(rtc->rtc_base + GEMINI_RTC_RECORD);
+	sec  = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);
+	min  = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);
+	hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);
+	days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS);
+	offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD);
 
 	time = offset + days * 86400 + hour * 3600 + min * 60 + sec;
 
@@ -86,9 +89,9 @@ static int gemini_rtc_read_time(struct device *dev, struct rtc_time *tm)
 	return 0;
 }
 
-static int gemini_rtc_set_time(struct device *dev, struct rtc_time *tm)
+static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-	struct gemini_rtc *rtc = dev_get_drvdata(dev);
+	struct ftrtc010_rtc *rtc = dev_get_drvdata(dev);
 	unsigned int sec, min, hour, day;
 	unsigned long offset, time;
 
@@ -97,27 +100,27 @@ static int gemini_rtc_set_time(struct device *dev, struct rtc_time *tm)
 
 	rtc_tm_to_time(tm, &time);
 
-	sec = readl(rtc->rtc_base + GEMINI_RTC_SECOND);
-	min = readl(rtc->rtc_base + GEMINI_RTC_MINUTE);
-	hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR);
-	day = readl(rtc->rtc_base + GEMINI_RTC_DAYS);
+	sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);
+	min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);
+	hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);
+	day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS);
 
 	offset = time - (day * 86400 + hour * 3600 + min * 60 + sec);
 
-	writel(offset, rtc->rtc_base + GEMINI_RTC_RECORD);
-	writel(0x01, rtc->rtc_base + GEMINI_RTC_CR);
+	writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD);
+	writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR);
 
 	return 0;
 }
 
-static const struct rtc_class_ops gemini_rtc_ops = {
-	.read_time     = gemini_rtc_read_time,
-	.set_time      = gemini_rtc_set_time,
+static const struct rtc_class_ops ftrtc010_rtc_ops = {
+	.read_time     = ftrtc010_rtc_read_time,
+	.set_time      = ftrtc010_rtc_set_time,
 };
 
-static int gemini_rtc_probe(struct platform_device *pdev)
+static int ftrtc010_rtc_probe(struct platform_device *pdev)
 {
-	struct gemini_rtc *rtc;
+	struct ftrtc010_rtc *rtc;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	int ret;
@@ -127,6 +130,27 @@ static int gemini_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, rtc);
 
+	rtc->pclk = devm_clk_get(dev, "PCLK");
+	if (IS_ERR(rtc->pclk)) {
+		dev_err(dev, "could not get PCLK\n");
+	} else {
+		ret = clk_prepare_enable(rtc->pclk);
+		if (ret) {
+			dev_err(dev, "failed to enable PCLK\n");
+			return ret;
+		}
+	}
+	rtc->extclk = devm_clk_get(dev, "EXTCLK");
+	if (IS_ERR(rtc->extclk)) {
+		dev_err(dev, "could not get EXTCLK\n");
+	} else {
+		ret = clk_prepare_enable(rtc->extclk);
+		if (ret) {
+			dev_err(dev, "failed to enable EXTCLK\n");
+			return ret;
+		}
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!res)
 		return -ENODEV;
@@ -142,38 +166,43 @@ static int gemini_rtc_probe(struct platform_device *pdev)
 	if (!rtc->rtc_base)
 		return -ENOMEM;
 
-	ret = devm_request_irq(dev, rtc->rtc_irq, gemini_rtc_interrupt,
+	ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt,
 			       IRQF_SHARED, pdev->name, dev);
 	if (unlikely(ret))
 		return ret;
 
 	rtc->rtc_dev = rtc_device_register(pdev->name, dev,
-					   &gemini_rtc_ops, THIS_MODULE);
+					   &ftrtc010_rtc_ops, THIS_MODULE);
 	return PTR_ERR_OR_ZERO(rtc->rtc_dev);
 }
 
-static int gemini_rtc_remove(struct platform_device *pdev)
+static int ftrtc010_rtc_remove(struct platform_device *pdev)
 {
-	struct gemini_rtc *rtc = platform_get_drvdata(pdev);
+	struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev);
 
+	if (!IS_ERR(rtc->extclk))
+		clk_disable_unprepare(rtc->extclk);
+	if (!IS_ERR(rtc->pclk))
+		clk_disable_unprepare(rtc->pclk);
 	rtc_device_unregister(rtc->rtc_dev);
 
 	return 0;
 }
 
-static const struct of_device_id gemini_rtc_dt_match[] = {
+static const struct of_device_id ftrtc010_rtc_dt_match[] = {
 	{ .compatible = "cortina,gemini-rtc" },
+	{ .compatible = "faraday,ftrtc010" },
 	{ }
 };
-MODULE_DEVICE_TABLE(of, gemini_rtc_dt_match);
+MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match);
 
-static struct platform_driver gemini_rtc_driver = {
+static struct platform_driver ftrtc010_rtc_driver = {
 	.driver		= {
 		.name	= DRV_NAME,
-		.of_match_table = gemini_rtc_dt_match,
+		.of_match_table = ftrtc010_rtc_dt_match,
 	},
-	.probe		= gemini_rtc_probe,
-	.remove		= gemini_rtc_remove,
+	.probe		= ftrtc010_rtc_probe,
+	.remove		= ftrtc010_rtc_remove,
 };
 
-module_platform_driver_probe(gemini_rtc_driver, gemini_rtc_probe);
+module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe);
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 5ec4653022ff..8940e9e43ea0 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -16,6 +16,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/bcd.h>
+#include <linux/clk-provider.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -53,6 +54,8 @@
 #define M41T80_ALARM_REG_SIZE	\
 	(M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON)
 
+#define M41T80_SQW_MAX_FREQ	32768
+
 #define M41T80_SEC_ST		BIT(7)	/* ST: Stop Bit */
 #define M41T80_ALMON_AFE	BIT(7)	/* AFE: AF Enable Bit */
 #define M41T80_ALMON_SQWE	BIT(6)	/* SQWE: SQW Enable Bit */
@@ -147,7 +150,11 @@ MODULE_DEVICE_TABLE(of, m41t80_of_match);
 
 struct m41t80_data {
 	unsigned long features;
+	struct i2c_client *client;
 	struct rtc_device *rtc;
+#ifdef CONFIG_COMMON_CLK
+	struct clk_hw sqw;
+#endif
 };
 
 static irqreturn_t m41t80_handle_irq(int irq, void *dev_id)
@@ -227,6 +234,7 @@ static int m41t80_get_datetime(struct i2c_client *client,
 /* Sets the given date and time to the real time clock. */
 static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
+	struct m41t80_data *clientdata = i2c_get_clientdata(client);
 	unsigned char buf[8];
 	int err, flags;
 
@@ -242,6 +250,17 @@ static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 	buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year - 100);
 	buf[M41T80_REG_WDAY] = tm->tm_wday;
 
+	/* If the square wave output is controlled in the weekday register */
+	if (clientdata->features & M41T80_FEATURE_SQ_ALT) {
+		int val;
+
+		val = i2c_smbus_read_byte_data(client, M41T80_REG_WDAY);
+		if (val < 0)
+			return val;
+
+		buf[M41T80_REG_WDAY] |= (val & 0xf0);
+	}
+
 	err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_SSEC,
 					     sizeof(buf), buf);
 	if (err < 0) {
@@ -332,6 +351,9 @@ static int m41t80_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 		return err;
 	}
 
+	/* Keep SQWE bit value */
+	alarmvals[0] |= (ret & M41T80_ALMON_SQWE);
+
 	ret = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
 	if (ret < 0)
 		return ret;
@@ -431,103 +453,175 @@ static ssize_t flags_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(flags);
 
-static ssize_t sqwfreq_show(struct device *dev,
-			    struct device_attribute *attr, char *buf)
+static struct attribute *attrs[] = {
+	&dev_attr_flags.attr,
+	NULL,
+};
+
+static struct attribute_group attr_group = {
+	.attrs = attrs,
+};
+
+#ifdef CONFIG_COMMON_CLK
+#define sqw_to_m41t80_data(_hw) container_of(_hw, struct m41t80_data, sqw)
+
+static unsigned long m41t80_sqw_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct m41t80_data *clientdata = i2c_get_clientdata(client);
-	int val, reg_sqw;
+	struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
+	struct i2c_client *client = m41t80->client;
+	int reg_sqw = (m41t80->features & M41T80_FEATURE_SQ_ALT) ?
+		M41T80_REG_WDAY : M41T80_REG_SQW;
+	int ret = i2c_smbus_read_byte_data(client, reg_sqw);
+	unsigned long val = M41T80_SQW_MAX_FREQ;
 
-	if (!(clientdata->features & M41T80_FEATURE_SQ))
-		return -EINVAL;
+	if (ret < 0)
+		return 0;
 
-	reg_sqw = M41T80_REG_SQW;
-	if (clientdata->features & M41T80_FEATURE_SQ_ALT)
-		reg_sqw = M41T80_REG_WDAY;
-	val = i2c_smbus_read_byte_data(client, reg_sqw);
-	if (val < 0)
-		return val;
-	val = (val >> 4) & 0xf;
-	switch (val) {
-	case 0:
-		break;
-	case 1:
-		val = 32768;
-		break;
-	default:
-		val = 32768 >> val;
-	}
-	return sprintf(buf, "%d\n", val);
+	ret >>= 4;
+	if (ret == 0)
+		val = 0;
+	else if (ret > 1)
+		val = val / (1 << ret);
+
+	return val;
 }
 
-static ssize_t sqwfreq_store(struct device *dev,
-			     struct device_attribute *attr,
-			     const char *buf, size_t count)
+static long m41t80_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
+				  unsigned long *prate)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct m41t80_data *clientdata = i2c_get_clientdata(client);
-	int almon, sqw, reg_sqw, rc;
-	unsigned long val;
+	int i, freq = M41T80_SQW_MAX_FREQ;
 
-	rc = kstrtoul(buf, 0, &val);
-	if (rc < 0)
-		return rc;
+	if (freq <= rate)
+		return freq;
 
-	if (!(clientdata->features & M41T80_FEATURE_SQ))
-		return -EINVAL;
+	for (i = 2; i <= ilog2(M41T80_SQW_MAX_FREQ); i++) {
+		freq /= 1 << i;
+		if (freq <= rate)
+			return freq;
+	}
 
-	if (val) {
-		if (!is_power_of_2(val))
+	return 0;
+}
+
+static int m41t80_sqw_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
+	struct i2c_client *client = m41t80->client;
+	int reg_sqw = (m41t80->features & M41T80_FEATURE_SQ_ALT) ?
+		M41T80_REG_WDAY : M41T80_REG_SQW;
+	int reg, ret, val = 0;
+
+	if (rate) {
+		if (!is_power_of_2(rate))
 			return -EINVAL;
-		val = ilog2(val);
-		if (val == 15)
+		val = ilog2(rate);
+		if (val == ilog2(M41T80_SQW_MAX_FREQ))
 			val = 1;
-		else if (val < 14)
-			val = 15 - val;
+		else if (val < (ilog2(M41T80_SQW_MAX_FREQ) - 1))
+			val = ilog2(M41T80_SQW_MAX_FREQ) - val;
 		else
 			return -EINVAL;
 	}
-	/* disable SQW, set SQW frequency & re-enable */
-	almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
-	if (almon < 0)
-		return almon;
-	reg_sqw = M41T80_REG_SQW;
-	if (clientdata->features & M41T80_FEATURE_SQ_ALT)
-		reg_sqw = M41T80_REG_WDAY;
-	sqw = i2c_smbus_read_byte_data(client, reg_sqw);
-	if (sqw < 0)
-		return sqw;
-	sqw = (sqw & 0x0f) | (val << 4);
-
-	rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
-				       almon & ~M41T80_ALMON_SQWE);
-	if (rc < 0)
-		return rc;
 
-	if (val) {
-		rc = i2c_smbus_write_byte_data(client, reg_sqw, sqw);
-		if (rc < 0)
-			return rc;
+	reg = i2c_smbus_read_byte_data(client, reg_sqw);
+	if (reg < 0)
+		return reg;
 
-		rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
-					       almon | M41T80_ALMON_SQWE);
-		if (rc < 0)
-			return rc;
-	}
-	return count;
+	reg = (reg & 0x0f) | (val << 4);
+
+	ret = i2c_smbus_write_byte_data(client, reg_sqw, reg);
+	if (ret < 0)
+		return ret;
+
+	return -EINVAL;
 }
-static DEVICE_ATTR_RW(sqwfreq);
 
-static struct attribute *attrs[] = {
-	&dev_attr_flags.attr,
-	&dev_attr_sqwfreq.attr,
-	NULL,
-};
+static int m41t80_sqw_control(struct clk_hw *hw, bool enable)
+{
+	struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
+	struct i2c_client *client = m41t80->client;
+	int ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
 
-static struct attribute_group attr_group = {
-	.attrs = attrs,
+	if (ret < 0)
+		return ret;
+
+	if (enable)
+		ret |= M41T80_ALMON_SQWE;
+	else
+		ret &= ~M41T80_ALMON_SQWE;
+
+	return i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, ret);
+}
+
+static int m41t80_sqw_prepare(struct clk_hw *hw)
+{
+	return m41t80_sqw_control(hw, 1);
+}
+
+static void m41t80_sqw_unprepare(struct clk_hw *hw)
+{
+	m41t80_sqw_control(hw, 0);
+}
+
+static int m41t80_sqw_is_prepared(struct clk_hw *hw)
+{
+	struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
+	struct i2c_client *client = m41t80->client;
+	int ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
+
+	if (ret < 0)
+		return ret;
+
+	return !!(ret & M41T80_ALMON_SQWE);
+}
+
+static const struct clk_ops m41t80_sqw_ops = {
+	.prepare = m41t80_sqw_prepare,
+	.unprepare = m41t80_sqw_unprepare,
+	.is_prepared = m41t80_sqw_is_prepared,
+	.recalc_rate = m41t80_sqw_recalc_rate,
+	.round_rate = m41t80_sqw_round_rate,
+	.set_rate = m41t80_sqw_set_rate,
 };
 
+static struct clk *m41t80_sqw_register_clk(struct m41t80_data *m41t80)
+{
+	struct i2c_client *client = m41t80->client;
+	struct device_node *node = client->dev.of_node;
+	struct clk *clk;
+	struct clk_init_data init;
+	int ret;
+
+	/* First disable the clock */
+	ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
+	if (ret < 0)
+		return ERR_PTR(ret);
+	ret = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
+					ret & ~(M41T80_ALMON_SQWE));
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	init.name = "m41t80-sqw";
+	init.ops = &m41t80_sqw_ops;
+	init.flags = 0;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+	m41t80->sqw.init = &init;
+
+	/* optional override of the clockname */
+	of_property_read_string(node, "clock-output-names", &init.name);
+
+	/* register the clock */
+	clk = clk_register(&client->dev, &m41t80->sqw);
+	if (!IS_ERR(clk))
+		of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+	return clk;
+}
+#endif
+
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 /*
  *****************************************************************************
@@ -845,6 +939,7 @@ static int m41t80_probe(struct i2c_client *client,
 	if (!m41t80_data)
 		return -ENOMEM;
 
+	m41t80_data->client = client;
 	if (client->dev.of_node)
 		m41t80_data->features = (unsigned long)
 			of_device_get_match_data(&client->dev);
@@ -937,6 +1032,10 @@ static int m41t80_probe(struct i2c_client *client,
 		}
 	}
 #endif
+#ifdef CONFIG_COMMON_CLK
+	if (m41t80_data->features & M41T80_FEATURE_SQ)
+		m41t80_sqw_register_clk(m41t80_data);
+#endif
 	return 0;
 }
 
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 77319122642a..401f46d8f21b 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -43,17 +43,6 @@
 
 #define MAX_PIE_NUM     9
 #define MAX_PIE_FREQ    512
-static const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
-	{ 2,		RTC_2HZ_BIT },
-	{ 4,		RTC_SAM0_BIT },
-	{ 8,		RTC_SAM1_BIT },
-	{ 16,		RTC_SAM2_BIT },
-	{ 32,		RTC_SAM3_BIT },
-	{ 64,		RTC_SAM4_BIT },
-	{ 128,		RTC_SAM5_BIT },
-	{ 256,		RTC_SAM6_BIT },
-	{ MAX_PIE_FREQ,	RTC_SAM7_BIT },
-};
 
 #define MXC_RTC_TIME	0
 #define MXC_RTC_ALARM	1
diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
index b1b6b3041bfb..4ed81117cf5f 100644
--- a/drivers/rtc/rtc-nuc900.c
+++ b/drivers/rtc/rtc-nuc900.c
@@ -93,7 +93,7 @@ static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)
 	__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
 
 	while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
-								&& timeout--)
+								&& --timeout)
 		mdelay(1);
 
 	if (!timeout)
diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c
index ea20f627dabe..e2a946c0e667 100644
--- a/drivers/rtc/rtc-opal.c
+++ b/drivers/rtc/rtc-opal.c
@@ -142,6 +142,16 @@ static int opal_get_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
 
 	y_m_d = be32_to_cpu(__y_m_d);
 	h_m_s_ms = ((u64)be32_to_cpu(__h_m) << 32);
+
+	/* check if no alarm is set */
+	if (y_m_d == 0 && h_m_s_ms == 0) {
+		pr_debug("No alarm is set\n");
+		rc = -ENOENT;
+		goto exit;
+	} else {
+		pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
+	}
+
 	opal_to_tm(y_m_d, h_m_s_ms, &alarm->time);
 
 exit:
@@ -157,7 +167,14 @@ static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
 	u32 y_m_d = 0;
 	int token, rc;
 
-	tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
+	/* if alarm is enabled */
+	if (alarm->enabled) {
+		tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
+		pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
+
+	} else {
+		pr_debug("Alarm getting disabled\n");
+	}
 
 	token = opal_async_get_token_interruptible();
 	if (token < 0) {
@@ -190,6 +207,18 @@ exit:
 	return rc;
 }
 
+int opal_tpo_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct rtc_wkalrm alarm = { .enabled = 0 };
+
+	/*
+	 * TPO is automatically enabled when opal_set_tpo_time() is called with
+	 * non-zero rtc-time. We only handle disable case which needs to be
+	 * explicitly told to opal.
+	 */
+	return enabled ? 0 : opal_set_tpo_time(dev, &alarm);
+}
+
 static struct rtc_class_ops opal_rtc_ops = {
 	.read_time	= opal_get_rtc_time,
 	.set_time	= opal_set_rtc_time,
@@ -205,6 +234,7 @@ static int opal_rtc_probe(struct platform_device *pdev)
 		device_set_wakeup_capable(&pdev->dev, true);
 		opal_rtc_ops.read_alarm	= opal_get_tpo_time;
 		opal_rtc_ops.set_alarm = opal_set_tpo_time;
+		opal_rtc_ops.alarm_irq_enable = opal_tpo_alarm_irq_enable;
 	}
 
 	rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 1227ceab61ee..cea6ea4df970 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -606,7 +606,7 @@ static int pcf8563_probe(struct i2c_client *client,
 		err = devm_request_threaded_irq(&client->dev, client->irq,
 				NULL, pcf8563_irq,
 				IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
-				pcf8563->rtc->name, client);
+				pcf8563_driver.driver.name, client);
 		if (err) {
 			dev_err(&client->dev, "unable to request IRQ %d\n",
 								client->irq);
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index 9ad97ab29866..aae2576741a6 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -68,6 +68,7 @@ struct rv8803_data {
 	struct mutex flags_lock;
 	u8 ctrl;
 	enum rv8803_type type;
+	struct nvmem_config nvmem_cfg;
 };
 
 static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
@@ -460,48 +461,32 @@ static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 	}
 }
 
-static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj,
-				  struct bin_attribute *attr,
-				  char *buf, loff_t off, size_t count)
+static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
+			      size_t bytes)
 {
-	struct device *dev = kobj_to_dev(kobj);
-	struct i2c_client *client = to_i2c_client(dev);
 	int ret;
 
-	ret = rv8803_write_reg(client, RV8803_RAM, buf[0]);
+	ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
 	if (ret)
 		return ret;
 
-	return 1;
+	return 0;
 }
 
-static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj,
-				 struct bin_attribute *attr,
-				 char *buf, loff_t off, size_t count)
+static int rv8803_nvram_read(void *priv, unsigned int offset,
+			     void *val, size_t bytes)
 {
-	struct device *dev = kobj_to_dev(kobj);
-	struct i2c_client *client = to_i2c_client(dev);
 	int ret;
 
-	ret = rv8803_read_reg(client, RV8803_RAM);
+	ret = rv8803_read_reg(priv, RV8803_RAM);
 	if (ret < 0)
 		return ret;
 
-	buf[0] = ret;
+	*(u8 *)val = ret;
 
-	return 1;
+	return 0;
 }
 
-static struct bin_attribute rv8803_nvram_attr = {
-	.attr = {
-		.name = "nvram",
-		.mode = S_IRUGO | S_IWUSR,
-	},
-	.size = 1,
-	.read = rv8803_nvram_read,
-	.write = rv8803_nvram_write,
-};
-
 static struct rtc_class_ops rv8803_rtc_ops = {
 	.read_time = rv8803_get_time,
 	.set_time = rv8803_set_time,
@@ -577,6 +562,11 @@ static int rv8803_probe(struct i2c_client *client,
 	if (flags & RV8803_FLAG_AF)
 		dev_warn(&client->dev, "An alarm maybe have been missed.\n");
 
+	rv8803->rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(rv8803->rtc)) {
+		return PTR_ERR(rv8803->rtc);
+	}
+
 	if (client->irq > 0) {
 		err = devm_request_threaded_irq(&client->dev, client->irq,
 						NULL, rv8803_handle_irq,
@@ -592,12 +582,20 @@ static int rv8803_probe(struct i2c_client *client,
 		}
 	}
 
-	rv8803->rtc = devm_rtc_device_register(&client->dev, client->name,
-					       &rv8803_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rv8803->rtc)) {
-		dev_err(&client->dev, "unable to register the class device\n");
-		return PTR_ERR(rv8803->rtc);
-	}
+	rv8803->nvmem_cfg.name = "rv8803_nvram",
+	rv8803->nvmem_cfg.word_size = 1,
+	rv8803->nvmem_cfg.stride = 1,
+	rv8803->nvmem_cfg.size = 1,
+	rv8803->nvmem_cfg.reg_read = rv8803_nvram_read,
+	rv8803->nvmem_cfg.reg_write = rv8803_nvram_write,
+	rv8803->nvmem_cfg.priv = client;
+
+	rv8803->rtc->ops = &rv8803_rtc_ops;
+	rv8803->rtc->nvmem_config = &rv8803->nvmem_cfg;
+	rv8803->rtc->nvram_old_abi = true;
+	err = rtc_register_device(rv8803->rtc);
+	if (err)
+		return err;
 
 	err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
 	if (err)
@@ -609,22 +607,11 @@ static int rv8803_probe(struct i2c_client *client,
 		return err;
 	}
 
-	err = device_create_bin_file(&client->dev, &rv8803_nvram_attr);
-	if (err)
-		return err;
-
 	rv8803->rtc->max_user_freq = 1;
 
 	return 0;
 }
 
-static int rv8803_remove(struct i2c_client *client)
-{
-	device_remove_bin_file(&client->dev, &rv8803_nvram_attr);
-
-	return 0;
-}
-
 static const struct i2c_device_id rv8803_id[] = {
 	{ "rv8803", rv_8803 },
 	{ "rx8900", rx_8900 },
@@ -651,7 +638,6 @@ static struct i2c_driver rv8803_driver = {
 		.of_match_table = of_match_ptr(rv8803_of_match),
 	},
 	.probe		= rv8803_probe,
-	.remove		= rv8803_remove,
 	.id_table	= rv8803_id,
 };
 module_i2c_driver(rv8803_driver);
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index d44fb34df8fe..a8992c227f61 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -41,7 +41,7 @@ struct s3c_rtc {
 	struct clk *rtc_src_clk;
 	bool clk_disabled;
 
-	struct s3c_rtc_data *data;
+	const struct s3c_rtc_data *data;
 
 	int irq_alarm;
 	int irq_tick;
@@ -49,7 +49,8 @@ struct s3c_rtc {
 	spinlock_t pie_lock;
 	spinlock_t alarm_clk_lock;
 
-	int ticnt_save, ticnt_en_save;
+	int ticnt_save;
+	int ticnt_en_save;
 	bool wake_en;
 };
 
@@ -67,18 +68,32 @@ struct s3c_rtc_data {
 	void (*disable) (struct s3c_rtc *info);
 };
 
-static void s3c_rtc_enable_clk(struct s3c_rtc *info)
+static int s3c_rtc_enable_clk(struct s3c_rtc *info)
 {
 	unsigned long irq_flags;
+	int ret = 0;
 
 	spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
+
 	if (info->clk_disabled) {
-		clk_enable(info->rtc_clk);
-		if (info->data->needs_src_clk)
-			clk_enable(info->rtc_src_clk);
+		ret = clk_enable(info->rtc_clk);
+		if (ret)
+			goto out;
+
+		if (info->data->needs_src_clk) {
+			ret = clk_enable(info->rtc_src_clk);
+			if (ret) {
+				clk_disable(info->rtc_clk);
+				goto out;
+			}
+		}
 		info->clk_disabled = false;
 	}
+
+out:
 	spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
+
+	return ret;
 }
 
 static void s3c_rtc_disable_clk(struct s3c_rtc *info)
@@ -121,10 +136,13 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
 	unsigned int tmp;
+	int ret;
 
 	dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 
@@ -135,10 +153,13 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 
 	s3c_rtc_disable_clk(info);
 
-	if (enabled)
-		s3c_rtc_enable_clk(info);
-	else
+	if (enabled) {
+		ret = s3c_rtc_enable_clk(info);
+		if (ret)
+			return ret;
+	} else {
 		s3c_rtc_disable_clk(info);
+	}
 
 	return 0;
 }
@@ -146,10 +167,14 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 /* Set RTC frequency */
 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
 {
+	int ret;
+
 	if (!is_power_of_2(freq))
 		return -EINVAL;
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 	spin_lock_irq(&info->pie_lock);
 
 	if (info->data->set_freq)
@@ -166,10 +191,13 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
 	unsigned int have_retried = 0;
+	int ret;
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
- retry_get_time:
+retry_get_time:
 	rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
 	rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
 	rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
@@ -199,8 +227,8 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 	rtc_tm->tm_year += 100;
 
 	dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
-		 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
-		 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
+		1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
+		rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
 
 	rtc_tm->tm_mon -= 1;
 
@@ -211,10 +239,11 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
 	int year = tm->tm_year - 100;
+	int ret;
 
 	dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
-		 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
-		 tm->tm_hour, tm->tm_min, tm->tm_sec);
+		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
+		tm->tm_hour, tm->tm_min, tm->tm_sec);
 
 	/* we get around y2k by simply not supporting it */
 
@@ -223,7 +252,9 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 		return -EINVAL;
 	}
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
 	writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
@@ -242,8 +273,11 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	struct s3c_rtc *info = dev_get_drvdata(dev);
 	struct rtc_time *alm_tm = &alrm->time;
 	unsigned int alm_en;
+	int ret;
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
 	alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
@@ -259,9 +293,9 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 
 	dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
-		 alm_en,
-		 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
-		 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
+		alm_en,
+		1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
+		alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
 
 	/* decode the alarm enable field */
 	if (alm_en & S3C2410_RTCALM_SECEN)
@@ -292,14 +326,17 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	struct s3c_rtc *info = dev_get_drvdata(dev);
 	struct rtc_time *tm = &alrm->time;
 	unsigned int alrm_en;
+	int ret;
 	int year = tm->tm_year - 100;
 
 	dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
-		 alrm->enabled,
-		 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
-		 tm->tm_hour, tm->tm_min, tm->tm_sec);
+		alrm->enabled,
+		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
+		tm->tm_hour, tm->tm_min, tm->tm_sec);
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
 	writeb(0x00, info->base + S3C2410_RTCALM);
@@ -348,8 +385,11 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
+	int ret;
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	if (info->data->enable_tick)
 		info->data->enable_tick(info, seq);
@@ -378,8 +418,7 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 		dev_info(info->dev, "rtc disabled, re-enabling\n");
 
 		tmp = readw(info->base + S3C2410_RTCCON);
-		writew(tmp | S3C2410_RTCCON_RTCEN,
-			info->base + S3C2410_RTCCON);
+		writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
 	}
 
 	if (con & S3C2410_RTCCON_CNTSEL) {
@@ -387,7 +426,7 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 
 		tmp = readw(info->base + S3C2410_RTCCON);
 		writew(tmp & ~S3C2410_RTCCON_CNTSEL,
-			info->base + S3C2410_RTCCON);
+		       info->base + S3C2410_RTCCON);
 	}
 
 	if (con & S3C2410_RTCCON_CLKRST) {
@@ -395,7 +434,7 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 
 		tmp = readw(info->base + S3C2410_RTCCON);
 		writew(tmp & ~S3C2410_RTCCON_CLKRST,
-			info->base + S3C2410_RTCCON);
+		       info->base + S3C2410_RTCCON);
 	}
 }
 
@@ -437,12 +476,12 @@ static int s3c_rtc_remove(struct platform_device *pdev)
 
 static const struct of_device_id s3c_rtc_dt_match[];
 
-static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
+static const struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 
 	match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
-	return (struct s3c_rtc_data *)match->data;
+	return match->data;
 }
 
 static int s3c_rtc_probe(struct platform_device *pdev)
@@ -481,7 +520,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 	}
 
 	dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
-		 info->irq_tick, info->irq_alarm);
+		info->irq_tick, info->irq_alarm);
 
 	/* get the memory region */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -498,7 +537,9 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 			dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
 		return ret;
 	}
-	clk_prepare_enable(info->rtc_clk);
+	ret = clk_prepare_enable(info->rtc_clk);
+	if (ret)
+		return ret;
 
 	if (info->data->needs_src_clk) {
 		info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
@@ -510,10 +551,11 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 			else
 				dev_dbg(&pdev->dev,
 					"probe deferred due to missing rtc src clk\n");
-			clk_disable_unprepare(info->rtc_clk);
-			return ret;
+			goto err_src_clk;
 		}
-		clk_prepare_enable(info->rtc_src_clk);
+		ret = clk_prepare_enable(info->rtc_src_clk);
+		if (ret)
+			goto err_src_clk;
 	}
 
 	/* check to see if everything is setup correctly */
@@ -521,7 +563,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 		info->data->enable(info);
 
 	dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
-		 readw(info->base + S3C2410_RTCCON));
+		readw(info->base + S3C2410_RTCCON));
 
 	device_init_wakeup(&pdev->dev, 1);
 
@@ -541,7 +583,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	/* register RTC and exit */
 	info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
-				  THIS_MODULE);
+					     THIS_MODULE);
 	if (IS_ERR(info->rtc)) {
 		dev_err(&pdev->dev, "cannot attach rtc\n");
 		ret = PTR_ERR(info->rtc);
@@ -549,14 +591,14 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
-			  0,  "s3c2410-rtc alarm", info);
+			       0, "s3c2410-rtc alarm", info);
 	if (ret) {
 		dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
 		goto err_nortc;
 	}
 
 	ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
-			  0,  "s3c2410-rtc tick", info);
+			       0, "s3c2410-rtc tick", info);
 	if (ret) {
 		dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
 		goto err_nortc;
@@ -569,12 +611,13 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	return 0;
 
- err_nortc:
+err_nortc:
 	if (info->data->disable)
 		info->data->disable(info);
 
 	if (info->data->needs_src_clk)
 		clk_disable_unprepare(info->rtc_src_clk);
+err_src_clk:
 	clk_disable_unprepare(info->rtc_clk);
 
 	return ret;
@@ -585,8 +628,11 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 static int s3c_rtc_suspend(struct device *dev)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
+	int ret;
 
-	s3c_rtc_enable_clk(info);
+	ret = s3c_rtc_enable_clk(info);
+	if (ret)
+		return ret;
 
 	/* save TICNT for anyone using periodic interrupts */
 	if (info->data->save_tick_cnt)
@@ -747,8 +793,7 @@ static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
 	writel(info->ticnt_save, info->base + S3C2410_TICNT);
 	if (info->ticnt_en_save) {
 		con = readw(info->base + S3C2410_RTCCON);
-		writew(con | info->ticnt_en_save,
-				info->base + S3C2410_RTCCON);
+		writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
 	}
 }
 
@@ -802,19 +847,19 @@ static struct s3c_rtc_data const s3c6410_rtc_data = {
 static const struct of_device_id s3c_rtc_dt_match[] = {
 	{
 		.compatible = "samsung,s3c2410-rtc",
-		.data = (void *)&s3c2410_rtc_data,
+		.data = &s3c2410_rtc_data,
 	}, {
 		.compatible = "samsung,s3c2416-rtc",
-		.data = (void *)&s3c2416_rtc_data,
+		.data = &s3c2416_rtc_data,
 	}, {
 		.compatible = "samsung,s3c2443-rtc",
-		.data = (void *)&s3c2443_rtc_data,
+		.data = &s3c2443_rtc_data,
 	}, {
 		.compatible = "samsung,s3c6410-rtc",
-		.data = (void *)&s3c6410_rtc_data,
+		.data = &s3c6410_rtc_data,
 	}, {
 		.compatible = "samsung,exynos3250-rtc",
-		.data = (void *)&s3c6410_rtc_data,
+		.data = &s3c6410_rtc_data,
 	},
 	{ /* sentinel */ },
 };
diff --git a/drivers/rtc/rtc-st-lpc.c b/drivers/rtc/rtc-st-lpc.c
index 74c0a336ceea..82b0af159a28 100644
--- a/drivers/rtc/rtc-st-lpc.c
+++ b/drivers/rtc/rtc-st-lpc.c
@@ -99,7 +99,7 @@ static int st_rtc_read_time(struct device *dev, struct rtc_time *tm)
 
 	lpt = ((unsigned long long)lpt_msb << 32) | lpt_lsb;
 	do_div(lpt, rtc->clkrate);
-	rtc_time_to_tm(lpt, tm);
+	rtc_time64_to_tm(lpt, tm);
 
 	return 0;
 }
@@ -107,13 +107,10 @@ static int st_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int st_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct st_rtc *rtc = dev_get_drvdata(dev);
-	unsigned long long lpt;
-	unsigned long secs, flags;
-	int ret;
+	unsigned long long lpt, secs;
+	unsigned long flags;
 
-	ret = rtc_tm_to_time(tm, &secs);
-	if (ret)
-		return ret;
+	secs = rtc_tm_to_time64(tm);
 
 	lpt = (unsigned long long)secs * rtc->clkrate;
 
@@ -161,13 +158,13 @@ static int st_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct st_rtc *rtc = dev_get_drvdata(dev);
 	struct rtc_time now;
-	unsigned long now_secs;
-	unsigned long alarm_secs;
+	unsigned long long now_secs;
+	unsigned long long alarm_secs;
 	unsigned long long lpa;
 
 	st_rtc_read_time(dev, &now);
-	rtc_tm_to_time(&now, &now_secs);
-	rtc_tm_to_time(&t->time, &alarm_secs);
+	now_secs = rtc_tm_to_time64(&now);
+	alarm_secs = rtc_tm_to_time64(&t->time);
 
 	/* Invalid alarm time */
 	if (now_secs > alarm_secs)
diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c
index bd57eb1029e1..3a5c3d7d0c77 100644
--- a/drivers/rtc/rtc-stm32.c
+++ b/drivers/rtc/rtc-stm32.c
@@ -94,11 +94,17 @@
 /* STM32_PWR_CR bit field */
 #define PWR_CR_DBP			BIT(8)
 
+struct stm32_rtc_data {
+	bool has_pclk;
+};
+
 struct stm32_rtc {
 	struct rtc_device *rtc_dev;
 	void __iomem *base;
 	struct regmap *dbp;
-	struct clk *ck_rtc;
+	struct stm32_rtc_data *data;
+	struct clk *pclk;
+	struct clk *rtc_ck;
 	int irq_alarm;
 };
 
@@ -122,9 +128,9 @@ static int stm32_rtc_enter_init_mode(struct stm32_rtc *rtc)
 		writel_relaxed(isr, rtc->base + STM32_RTC_ISR);
 
 		/*
-		 * It takes around 2 ck_rtc clock cycles to enter in
+		 * It takes around 2 rtc_ck clock cycles to enter in
 		 * initialization phase mode (and have INITF flag set). As
-		 * slowest ck_rtc frequency may be 32kHz and highest should be
+		 * slowest rtc_ck frequency may be 32kHz and highest should be
 		 * 1MHz, we poll every 10 us with a timeout of 100ms.
 		 */
 		return readl_relaxed_poll_timeout_atomic(
@@ -153,7 +159,7 @@ static int stm32_rtc_wait_sync(struct stm32_rtc *rtc)
 
 	/*
 	 * Wait for RSF to be set to ensure the calendar registers are
-	 * synchronised, it takes around 2 ck_rtc clock cycles
+	 * synchronised, it takes around 2 rtc_ck clock cycles
 	 */
 	return readl_relaxed_poll_timeout_atomic(rtc->base + STM32_RTC_ISR,
 						 isr,
@@ -456,7 +462,7 @@ static int stm32_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 
 	/*
 	 * Poll Alarm write flag to be sure that Alarm update is allowed: it
-	 * takes around 2 ck_rtc clock cycles
+	 * takes around 2 rtc_ck clock cycles
 	 */
 	ret = readl_relaxed_poll_timeout_atomic(rtc->base + STM32_RTC_ISR,
 						isr,
@@ -490,8 +496,17 @@ static const struct rtc_class_ops stm32_rtc_ops = {
 	.alarm_irq_enable = stm32_rtc_alarm_irq_enable,
 };
 
+static const struct stm32_rtc_data stm32_rtc_data = {
+	.has_pclk = false,
+};
+
+static const struct stm32_rtc_data stm32h7_rtc_data = {
+	.has_pclk = true,
+};
+
 static const struct of_device_id stm32_rtc_of_match[] = {
-	{ .compatible = "st,stm32-rtc" },
+	{ .compatible = "st,stm32-rtc", .data = &stm32_rtc_data },
+	{ .compatible = "st,stm32h7-rtc", .data = &stm32h7_rtc_data },
 	{}
 };
 MODULE_DEVICE_TABLE(of, stm32_rtc_of_match);
@@ -503,7 +518,7 @@ static int stm32_rtc_init(struct platform_device *pdev,
 	unsigned int rate;
 	int ret = 0;
 
-	rate = clk_get_rate(rtc->ck_rtc);
+	rate = clk_get_rate(rtc->rtc_ck);
 
 	/* Find prediv_a and prediv_s to obtain the 1Hz calendar clock */
 	pred_a_max = STM32_RTC_PRER_PRED_A >> STM32_RTC_PRER_PRED_A_SHIFT;
@@ -524,7 +539,7 @@ static int stm32_rtc_init(struct platform_device *pdev,
 		pred_a = pred_a_max;
 		pred_s = (rate / (pred_a + 1)) - 1;
 
-		dev_warn(&pdev->dev, "ck_rtc is %s\n",
+		dev_warn(&pdev->dev, "rtc_ck is %s\n",
 			 (rate < ((pred_a + 1) * (pred_s + 1))) ?
 			 "fast" : "slow");
 	}
@@ -561,6 +576,7 @@ static int stm32_rtc_probe(struct platform_device *pdev)
 {
 	struct stm32_rtc *rtc;
 	struct resource *res;
+	const struct of_device_id *match;
 	int ret;
 
 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
@@ -579,15 +595,34 @@ static int stm32_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(rtc->dbp);
 	}
 
-	rtc->ck_rtc = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(rtc->ck_rtc)) {
-		dev_err(&pdev->dev, "no ck_rtc clock");
-		return PTR_ERR(rtc->ck_rtc);
+	match = of_match_device(stm32_rtc_of_match, &pdev->dev);
+	rtc->data = (struct stm32_rtc_data *)match->data;
+
+	if (!rtc->data->has_pclk) {
+		rtc->pclk = NULL;
+		rtc->rtc_ck = devm_clk_get(&pdev->dev, NULL);
+	} else {
+		rtc->pclk = devm_clk_get(&pdev->dev, "pclk");
+		if (IS_ERR(rtc->pclk)) {
+			dev_err(&pdev->dev, "no pclk clock");
+			return PTR_ERR(rtc->pclk);
+		}
+		rtc->rtc_ck = devm_clk_get(&pdev->dev, "rtc_ck");
+	}
+	if (IS_ERR(rtc->rtc_ck)) {
+		dev_err(&pdev->dev, "no rtc_ck clock");
+		return PTR_ERR(rtc->rtc_ck);
+	}
+
+	if (rtc->data->has_pclk) {
+		ret = clk_prepare_enable(rtc->pclk);
+		if (ret)
+			return ret;
 	}
 
-	ret = clk_prepare_enable(rtc->ck_rtc);
+	ret = clk_prepare_enable(rtc->rtc_ck);
 	if (ret)
-		return ret;
+		goto err;
 
 	regmap_update_bits(rtc->dbp, PWR_CR, PWR_CR_DBP, PWR_CR_DBP);
 
@@ -595,7 +630,7 @@ static int stm32_rtc_probe(struct platform_device *pdev)
 	 * After a system reset, RTC_ISR.INITS flag can be read to check if
 	 * the calendar has been initalized or not. INITS flag is reset by a
 	 * power-on reset (no vbat, no power-supply). It is not reset if
-	 * ck_rtc parent clock has changed (so RTC prescalers need to be
+	 * rtc_ck parent clock has changed (so RTC prescalers need to be
 	 * changed). That's why we cannot rely on this flag to know if RTC
 	 * init has to be done.
 	 */
@@ -646,7 +681,9 @@ static int stm32_rtc_probe(struct platform_device *pdev)
 
 	return 0;
 err:
-	clk_disable_unprepare(rtc->ck_rtc);
+	if (rtc->data->has_pclk)
+		clk_disable_unprepare(rtc->pclk);
+	clk_disable_unprepare(rtc->rtc_ck);
 
 	regmap_update_bits(rtc->dbp, PWR_CR, PWR_CR_DBP, 0);
 
@@ -667,7 +704,9 @@ static int stm32_rtc_remove(struct platform_device *pdev)
 	writel_relaxed(cr, rtc->base + STM32_RTC_CR);
 	stm32_rtc_wpr_lock(rtc);
 
-	clk_disable_unprepare(rtc->ck_rtc);
+	clk_disable_unprepare(rtc->rtc_ck);
+	if (rtc->data->has_pclk)
+		clk_disable_unprepare(rtc->pclk);
 
 	/* Enable backup domain write protection */
 	regmap_update_bits(rtc->dbp, PWR_CR, PWR_CR_DBP, 0);
@@ -682,6 +721,9 @@ static int stm32_rtc_suspend(struct device *dev)
 {
 	struct stm32_rtc *rtc = dev_get_drvdata(dev);
 
+	if (rtc->data->has_pclk)
+		clk_disable_unprepare(rtc->pclk);
+
 	if (device_may_wakeup(dev))
 		return enable_irq_wake(rtc->irq_alarm);
 
@@ -693,6 +735,12 @@ static int stm32_rtc_resume(struct device *dev)
 	struct stm32_rtc *rtc = dev_get_drvdata(dev);
 	int ret = 0;
 
+	if (rtc->data->has_pclk) {
+		ret = clk_prepare_enable(rtc->pclk);
+		if (ret)
+			return ret;
+	}
+
 	ret = stm32_rtc_wait_sync(rtc);
 	if (ret < 0)
 		return ret;
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index 1218d5d4224d..e364550eb9a7 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -27,7 +27,8 @@
 static ssize_t
 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", to_rtc_device(dev)->name);
+	return sprintf(buf, "%s %s\n", dev_driver_string(dev->parent),
+		       dev_name(dev->parent));
 }
 static DEVICE_ATTR_RO(name);
author	Linus Torvalds	2017-07-13 12:15:06 -0700
committer	Linus Torvalds	2017-07-13 12:15:06 -0700
commit	3a00be19238ca330ce43abd33caac8eff343800c (patch)
tree	a19fd8bac6b20a6b7a5e742fb60adb629ce8c3e0 /drivers
parent	b5e16170f59b4ae38937b795a56a356fb95cca56 (diff)
parent	40bf6a35483ee25271ce2a90d8976cf1409a033a (diff)