Merge tag 'linux-watchdog-6.1-rc1' of git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:

 - new driver for Exar/MaxLinear XR28V38x

 - support for exynosautov9 SoC

 - support for Renesas R-Car V5H (R8A779G0) and RZ/V2M (r9a09g011) SoC

 - support for imx93

 - several other fixes and improvements

* tag 'linux-watchdog-6.1-rc1' of git://www.linux-watchdog.org/linux-watchdog: (36 commits)
  watchdog: twl4030_wdt: add missing mod_devicetable.h include
  dt-bindings: watchdog: migrate mt7621 text bindings to YAML
  watchdog: sp5100_tco: Add "action" module parameter
  watchdog: imx93: add watchdog timer on imx93
  watchdog: imx7ulp_wdt: init wdog when it was active
  watchdog: imx7ulp_wdt: Handle wdog reconfigure failure
  watchdog: imx7ulp_wdt: Fix RCS timeout issue
  watchdog: imx7ulp_wdt: Check CMD32EN in wdog init
  watchdog: imx7ulp: Add explict memory barrier for unlock sequence
  watchdog: imx7ulp: Move suspend/resume to noirq phase
  watchdog: rti-wdt:using the pm_runtime_resume_and_get to simplify the code
  dt-bindings: watchdog: rockchip: add rockchip,rk3128-wdt
  watchdog: s3c2410_wdt: support exynosautov9 watchdog
  dt-bindings: watchdog: add exynosautov9 compatible
  watchdog: npcm: Enable clock if provided
  watchdog: meson: keep running if already active
  watchdog: dt-bindings: atmel,at91sam9-wdt: convert to json-schema
  watchdog: armada_37xx_wdt: Fix .set_timeout callback
  watchdog: sa1100: make variable sa1100dog_driver static
  watchdog: w83977f_wdt: Fix comment typo
  ...

22 files changed, 808 insertions, 105 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 76c3500b21c7..b64bc49c7f30 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1089,6 +1089,17 @@ config EBC_C384_WDT
 	  WinSystems EBC-C384 motherboard. The timeout may be configured via
 	  the timeout module parameter.
 
+config EXAR_WDT
+	tristate "Exar Watchdog Timer"
+	depends on X86
+	select WATCHDOG_CORE
+	help
+	  Enables watchdog timer support for the watchdog timer present
+	  in some Exar/MaxLinear UART chips like the XR28V38x.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called exar_wdt.
+
 config F71808E_WDT
 	tristate "Fintek F718xx, F818xx Super I/O Watchdog"
 	depends on X86
@@ -1315,7 +1326,7 @@ config IT87_WDT
 config HP_WATCHDOG
 	tristate "HP ProLiant iLO2+ Hardware Watchdog Timer"
 	select WATCHDOG_CORE
-	depends on X86 && PCI
+	depends on (ARM64 || X86) && PCI
 	help
 	  A software monitoring watchdog and NMI handling driver. This driver
 	  will detect lockups and provide a stack trace. This is a driver that
@@ -1325,7 +1336,7 @@ config HP_WATCHDOG
 
 config HPWDT_NMI_DECODING
 	bool "NMI support for the HP ProLiant iLO2+ Hardware Watchdog Timer"
-	depends on HP_WATCHDOG
+	depends on X86 && HP_WATCHDOG
 	default y
 	help
 	  Enables the NMI handler for the watchdog pretimeout NMI and the iLO
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index cdeb119e6e61..d41e5f830ae7 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
 obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
 obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
 obj-$(CONFIG_EBC_C384_WDT) += ebc-c384_wdt.o
+obj-$(CONFIG_EXAR_WDT) += exar_wdt.o
 obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
 obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o
 obj-$(CONFIG_GEODE_WDT) += geodewdt.o
diff --git a/drivers/watchdog/armada_37xx_wdt.c b/drivers/watchdog/armada_37xx_wdt.c
index 854b1cc723cb..ac9fed1ef681 100644
--- a/drivers/watchdog/armada_37xx_wdt.c
+++ b/drivers/watchdog/armada_37xx_wdt.c
@@ -179,6 +179,8 @@ static int armada_37xx_wdt_set_timeout(struct watchdog_device *wdt,
 	dev->timeout = (u64)dev->clk_rate * timeout;
 	do_div(dev->timeout, CNTR_CTRL_PRESCALE_MIN);
 
+	set_counter_value(dev, CNTR_ID_WDOG, dev->timeout);
+
 	return 0;
 }
 
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index bd06622813eb..0cff2adfbfc9 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -332,18 +332,18 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 		u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
 
 		reg &= config->ext_pulse_width_mask;
-		if (of_property_read_bool(np, "aspeed,ext-push-pull"))
-			reg |= WDT_PUSH_PULL_MAGIC;
+		if (of_property_read_bool(np, "aspeed,ext-active-high"))
+			reg |= WDT_ACTIVE_HIGH_MAGIC;
 		else
-			reg |= WDT_OPEN_DRAIN_MAGIC;
+			reg |= WDT_ACTIVE_LOW_MAGIC;
 
 		writel(reg, wdt->base + WDT_RESET_WIDTH);
 
 		reg &= config->ext_pulse_width_mask;
-		if (of_property_read_bool(np, "aspeed,ext-active-high"))
-			reg |= WDT_ACTIVE_HIGH_MAGIC;
+		if (of_property_read_bool(np, "aspeed,ext-push-pull"))
+			reg |= WDT_PUSH_PULL_MAGIC;
 		else
-			reg |= WDT_ACTIVE_LOW_MAGIC;
+			reg |= WDT_OPEN_DRAIN_MAGIC;
 
 		writel(reg, wdt->base + WDT_RESET_WIDTH);
 	}
diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c
index 0b6999f3b6e8..4a20e07fbb69 100644
--- a/drivers/watchdog/bd9576_wdt.c
+++ b/drivers/watchdog/bd9576_wdt.c
@@ -9,8 +9,8 @@
 #include <linux/gpio/consumer.h>
 #include <linux/mfd/rohm-bd957x.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/watchdog.h>
 
@@ -202,10 +202,10 @@ static int bd957x_set_wdt_mode(struct bd9576_wdt_priv *priv, int hw_margin,
 static int bd9576_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->parent->of_node;
 	struct bd9576_wdt_priv *priv;
 	u32 hw_margin[2];
 	u32 hw_margin_max = BD957X_WDT_DEFAULT_MARGIN, hw_margin_min = 0;
+	int count;
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -221,40 +221,51 @@ static int bd9576_wdt_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	priv->gpiod_en = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
-						     "rohm,watchdog-enable-gpios",
-						     0, GPIOD_OUT_LOW,
-						     "watchdog-enable");
+	priv->gpiod_en = devm_fwnode_gpiod_get(dev, dev_fwnode(dev->parent),
+					       "rohm,watchdog-enable",
+					       GPIOD_OUT_LOW,
+					       "watchdog-enable");
 	if (IS_ERR(priv->gpiod_en))
 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_en),
 			      "getting watchdog-enable GPIO failed\n");
 
-	priv->gpiod_ping = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
-						     "rohm,watchdog-ping-gpios",
-						     0, GPIOD_OUT_LOW,
-						     "watchdog-ping");
+	priv->gpiod_ping = devm_fwnode_gpiod_get(dev, dev_fwnode(dev->parent),
+						 "rohm,watchdog-ping",
+						 GPIOD_OUT_LOW,
+						 "watchdog-ping");
 	if (IS_ERR(priv->gpiod_ping))
 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_ping),
 				     "getting watchdog-ping GPIO failed\n");
 
-	ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-ms",
-						  &hw_margin[0], 1, 2);
-	if (ret < 0 && ret != -EINVAL)
-		return ret;
+	count = device_property_count_u32(dev->parent, "rohm,hw-timeout-ms");
+	if (count < 0 && count != -EINVAL)
+		return count;
+
+	if (count > 0) {
+		if (count > ARRAY_SIZE(hw_margin))
+			return -EINVAL;
 
-	if (ret == 1)
-		hw_margin_max = hw_margin[0];
+		ret = device_property_read_u32_array(dev->parent,
+						     "rohm,hw-timeout-ms",
+						     hw_margin, count);
+		if (ret < 0)
+			return ret;
 
-	if (ret == 2) {
-		hw_margin_max = hw_margin[1];
-		hw_margin_min = hw_margin[0];
+		if (count == 1)
+			hw_margin_max = hw_margin[0];
+
+		if (count == 2) {
+			hw_margin_max = hw_margin[1];
+			hw_margin_min = hw_margin[0];
+		}
 	}
 
 	ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min);
 	if (ret)
 		return ret;
 
-	priv->always_running = of_property_read_bool(np, "always-running");
+	priv->always_running = device_property_read_bool(dev->parent,
+							 "always-running");
 
 	watchdog_set_drvdata(&priv->wdd, priv);
 
diff --git a/drivers/watchdog/eurotechwdt.c b/drivers/watchdog/eurotechwdt.c
index ce682942662c..e26609ad4c17 100644
--- a/drivers/watchdog/eurotechwdt.c
+++ b/drivers/watchdog/eurotechwdt.c
@@ -192,7 +192,7 @@ static void eurwdt_ping(void)
  * @ppos: pointer to the position to write. No seeks allowed
  *
  * A write to a watchdog device is defined as a keepalive signal. Any
- * write of data will do, as we we don't define content meaning.
+ * write of data will do, as we don't define content meaning.
  */
 
 static ssize_t eurwdt_write(struct file *file, const char __user *buf,
diff --git a/drivers/watchdog/exar_wdt.c b/drivers/watchdog/exar_wdt.c
new file mode 100644
index 000000000000..35058d8b21bc
--- /dev/null
+++ b/drivers/watchdog/exar_wdt.c
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *	exar_wdt.c - Driver for the watchdog present in some
+ *		     Exar/MaxLinear UART chips like the XR28V38x.
+ *
+ *	(c) Copyright 2022 D. Müller <d.mueller@elsoft.ch>.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/watchdog.h>
+
+#define DRV_NAME	"exar_wdt"
+
+static const unsigned short sio_config_ports[] = { 0x2e, 0x4e };
+static const unsigned char sio_enter_keys[] = { 0x67, 0x77, 0x87, 0xA0 };
+#define EXAR_EXIT_KEY	0xAA
+
+#define EXAR_LDN	0x07
+#define EXAR_DID	0x20
+#define EXAR_VID	0x23
+#define EXAR_WDT	0x26
+#define EXAR_ACT	0x30
+#define EXAR_RTBASE	0x60
+
+#define EXAR_WDT_LDEV	0x08
+
+#define EXAR_VEN_ID	0x13A8
+#define EXAR_DEV_382	0x0382
+#define EXAR_DEV_384	0x0384
+
+/* WDT runtime registers */
+#define WDT_CTRL	0x00
+#define WDT_VAL		0x01
+
+#define WDT_UNITS_10MS	0x0	/* the 10 millisec unit of the HW is not used */
+#define WDT_UNITS_SEC	0x2
+#define WDT_UNITS_MIN	0x4
+
+/* default WDT control for WDTOUT signal activ / rearm by read */
+#define EXAR_WDT_DEF_CONF	0
+
+struct wdt_pdev_node {
+	struct list_head list;
+	struct platform_device *pdev;
+	const char name[16];
+};
+
+struct wdt_priv {
+	/* the lock for WDT io operations */
+	spinlock_t io_lock;
+	struct resource wdt_res;
+	struct watchdog_device wdt_dev;
+	unsigned short did;
+	unsigned short config_port;
+	unsigned char enter_key;
+	unsigned char unit;
+	unsigned char timeout;
+};
+
+#define WATCHDOG_TIMEOUT 60
+
+static int timeout = WATCHDOG_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+		 "Watchdog timeout in seconds. 1<=timeout<=15300, default="
+		 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		 "Watchdog cannot be stopped once started (default="
+		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int exar_sio_enter(const unsigned short config_port,
+			  const unsigned char key)
+{
+	if (!request_muxed_region(config_port, 2, DRV_NAME))
+		return -EBUSY;
+
+	/* write the ENTER-KEY twice */
+	outb(key, config_port);
+	outb(key, config_port);
+
+	return 0;
+}
+
+static void exar_sio_exit(const unsigned short config_port)
+{
+	outb(EXAR_EXIT_KEY, config_port);
+	release_region(config_port, 2);
+}
+
+static unsigned char exar_sio_read(const unsigned short config_port,
+				   const unsigned char reg)
+{
+	outb(reg, config_port);
+	return inb(config_port + 1);
+}
+
+static void exar_sio_write(const unsigned short config_port,
+			   const unsigned char reg, const unsigned char val)
+{
+	outb(reg, config_port);
+	outb(val, config_port + 1);
+}
+
+static unsigned short exar_sio_read16(const unsigned short config_port,
+				      const unsigned char reg)
+{
+	unsigned char msb, lsb;
+
+	msb = exar_sio_read(config_port, reg);
+	lsb = exar_sio_read(config_port, reg + 1);
+
+	return (msb << 8) | lsb;
+}
+
+static void exar_sio_select_wdt(const unsigned short config_port)
+{
+	exar_sio_write(config_port, EXAR_LDN, EXAR_WDT_LDEV);
+}
+
+static void exar_wdt_arm(const struct wdt_priv *priv)
+{
+	unsigned short rt_base = priv->wdt_res.start;
+
+	/* write timeout value twice to arm watchdog */
+	outb(priv->timeout, rt_base + WDT_VAL);
+	outb(priv->timeout, rt_base + WDT_VAL);
+}
+
+static void exar_wdt_disarm(const struct wdt_priv *priv)
+{
+	unsigned short rt_base = priv->wdt_res.start;
+
+	/*
+	 * use two accesses with different values to make sure
+	 * that a combination of a previous single access and
+	 * the ones below with the same value are not falsely
+	 * interpreted as "arm watchdog"
+	 */
+	outb(0xFF, rt_base + WDT_VAL);
+	outb(0, rt_base + WDT_VAL);
+}
+
+static int exar_wdt_start(struct watchdog_device *wdog)
+{
+	struct wdt_priv *priv = watchdog_get_drvdata(wdog);
+	unsigned short rt_base = priv->wdt_res.start;
+
+	spin_lock(&priv->io_lock);
+
+	exar_wdt_disarm(priv);
+	outb(priv->unit, rt_base + WDT_CTRL);
+	exar_wdt_arm(priv);
+
+	spin_unlock(&priv->io_lock);
+	return 0;
+}
+
+static int exar_wdt_stop(struct watchdog_device *wdog)
+{
+	struct wdt_priv *priv = watchdog_get_drvdata(wdog);
+
+	spin_lock(&priv->io_lock);
+
+	exar_wdt_disarm(priv);
+
+	spin_unlock(&priv->io_lock);
+	return 0;
+}
+
+static int exar_wdt_keepalive(struct watchdog_device *wdog)
+{
+	struct wdt_priv *priv = watchdog_get_drvdata(wdog);
+	unsigned short rt_base = priv->wdt_res.start;
+
+	spin_lock(&priv->io_lock);
+
+	/* reading the WDT_VAL reg will feed the watchdog */
+	inb(rt_base + WDT_VAL);
+
+	spin_unlock(&priv->io_lock);
+	return 0;
+}
+
+static int exar_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t)
+{
+	struct wdt_priv *priv = watchdog_get_drvdata(wdog);
+	bool unit_min = false;
+
+	/*
+	 * if new timeout is bigger then 255 seconds, change the
+	 * unit to minutes and round the timeout up to the next whole minute
+	 */
+	if (t > 255) {
+		unit_min = true;
+		t = DIV_ROUND_UP(t, 60);
+	}
+
+	/* save for later use in exar_wdt_start() */
+	priv->unit = unit_min ? WDT_UNITS_MIN : WDT_UNITS_SEC;
+	priv->timeout = t;
+
+	wdog->timeout = unit_min ? t * 60 : t;
+
+	if (watchdog_hw_running(wdog))
+		exar_wdt_start(wdog);
+
+	return 0;
+}
+
+static const struct watchdog_info exar_wdt_info = {
+	.options	= WDIOF_KEEPALIVEPING |
+			  WDIOF_SETTIMEOUT |
+			  WDIOF_MAGICCLOSE,
+	.identity	= "Exar/MaxLinear XR28V38x Watchdog",
+};
+
+static const struct watchdog_ops exar_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= exar_wdt_start,
+	.stop		= exar_wdt_stop,
+	.ping		= exar_wdt_keepalive,
+	.set_timeout	= exar_wdt_set_timeout,
+};
+
+static int exar_wdt_config(struct watchdog_device *wdog,
+			   const unsigned char conf)
+{
+	struct wdt_priv *priv = watchdog_get_drvdata(wdog);
+	int ret;
+
+	ret = exar_sio_enter(priv->config_port, priv->enter_key);
+	if (ret)
+		return ret;
+
+	exar_sio_select_wdt(priv->config_port);
+	exar_sio_write(priv->config_port, EXAR_WDT, conf);
+
+	exar_sio_exit(priv->config_port);
+
+	return 0;
+}
+
+static int __init exar_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct wdt_priv *priv = dev->platform_data;
+	struct watchdog_device *wdt_dev = &priv->wdt_dev;
+	struct resource *res;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -ENXIO;
+
+	spin_lock_init(&priv->io_lock);
+
+	wdt_dev->info = &exar_wdt_info;
+	wdt_dev->ops = &exar_wdt_ops;
+	wdt_dev->min_timeout = 1;
+	wdt_dev->max_timeout = 255 * 60;
+
+	watchdog_init_timeout(wdt_dev, timeout, NULL);
+	watchdog_set_nowayout(wdt_dev, nowayout);
+	watchdog_stop_on_reboot(wdt_dev);
+	watchdog_stop_on_unregister(wdt_dev);
+	watchdog_set_drvdata(wdt_dev, priv);
+
+	ret = exar_wdt_config(wdt_dev, EXAR_WDT_DEF_CONF);
+	if (ret)
+		return ret;
+
+	exar_wdt_set_timeout(wdt_dev, timeout);
+	/* Make sure that the watchdog is not running */
+	exar_wdt_stop(wdt_dev);
+
+	ret = devm_watchdog_register_device(dev, wdt_dev);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "XR28V%X WDT initialized. timeout=%d sec (nowayout=%d)\n",
+		 priv->did, timeout, nowayout);
+
+	return 0;
+}
+
+static unsigned short __init exar_detect(const unsigned short config_port,
+					 const unsigned char key,
+					 unsigned short *rt_base)
+{
+	int ret;
+	unsigned short base = 0;
+	unsigned short vid, did;
+
+	ret = exar_sio_enter(config_port, key);
+	if (ret)
+		return 0;
+
+	vid = exar_sio_read16(config_port, EXAR_VID);
+	did = exar_sio_read16(config_port, EXAR_DID);
+
+	/* check for the vendor and device IDs we currently know about */
+	if (vid == EXAR_VEN_ID &&
+	    (did == EXAR_DEV_382 ||
+	     did == EXAR_DEV_384)) {
+		exar_sio_select_wdt(config_port);
+		/* is device active? */
+		if (exar_sio_read(config_port, EXAR_ACT) == 0x01)
+			base = exar_sio_read16(config_port, EXAR_RTBASE);
+	}
+
+	exar_sio_exit(config_port);
+
+	if (base) {
+		pr_debug("Found a XR28V%X WDT (conf: 0x%x / rt: 0x%04x)\n",
+			 did, config_port, base);
+		*rt_base = base;
+		return did;
+	}
+
+	return 0;
+}
+
+static struct platform_driver exar_wdt_driver = {
+	.driver = {
+		.name = DRV_NAME,
+	},
+};
+
+static LIST_HEAD(pdev_list);
+
+static int __init exar_wdt_register(struct wdt_priv *priv, const int idx)
+{
+	struct wdt_pdev_node *n;
+
+	n = kzalloc(sizeof(*n), GFP_KERNEL);
+	if (!n)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&n->list);
+
+	scnprintf((char *)n->name, sizeof(n->name), DRV_NAME ".%d", idx);
+	priv->wdt_res.name = n->name;
+
+	n->pdev = platform_device_register_resndata(NULL, DRV_NAME, idx,
+						    &priv->wdt_res, 1,
+						    priv, sizeof(*priv));
+	if (IS_ERR(n->pdev)) {
+		kfree(n);
+		return PTR_ERR(n->pdev);
+	}
+
+	list_add_tail(&n->list, &pdev_list);
+
+	return 0;
+}
+
+static void exar_wdt_unregister(void)
+{
+	struct wdt_pdev_node *n, *t;
+
+	list_for_each_entry_safe(n, t, &pdev_list, list) {
+		platform_device_unregister(n->pdev);
+		list_del(&n->list);
+		kfree(n);
+	}
+}
+
+static int __init exar_wdt_init(void)
+{
+	int ret, i, j, idx = 0;
+
+	/* search for active Exar watchdogs on all possible locations */
+	for (i = 0; i < ARRAY_SIZE(sio_config_ports); i++) {
+		for (j = 0; j < ARRAY_SIZE(sio_enter_keys); j++) {
+			unsigned short did, rt_base = 0;
+
+			did = exar_detect(sio_config_ports[i],
+					  sio_enter_keys[j],
+					  &rt_base);
+
+			if (did) {
+				struct wdt_priv priv = {
+					.wdt_res = DEFINE_RES_IO(rt_base, 2),
+					.did = did,
+					.config_port = sio_config_ports[i],
+					.enter_key = sio_enter_keys[j],
+				};
+
+				ret = exar_wdt_register(&priv, idx);
+				if (!ret)
+					idx++;
+			}
+		}
+	}
+
+	if (!idx)
+		return -ENODEV;
+
+	ret = platform_driver_probe(&exar_wdt_driver, exar_wdt_probe);
+	if (ret)
+		exar_wdt_unregister();
+
+	return ret;
+}
+
+static void __exit exar_wdt_exit(void)
+{
+	exar_wdt_unregister();
+	platform_driver_unregister(&exar_wdt_driver);
+}
+
+module_init(exar_wdt_init);
+module_exit(exar_wdt_exit);
+
+MODULE_AUTHOR("David Müller <d.mueller@elsoft.ch>");
+MODULE_DESCRIPTION("Exar/MaxLinear Watchdog Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/watchdog/ftwdt010_wdt.c b/drivers/watchdog/ftwdt010_wdt.c
index 21dcc7765688..442c5bf63ff4 100644
--- a/drivers/watchdog/ftwdt010_wdt.c
+++ b/drivers/watchdog/ftwdt010_wdt.c
@@ -47,21 +47,28 @@ struct ftwdt010_wdt *to_ftwdt010_wdt(struct watchdog_device *wdd)
 	return container_of(wdd, struct ftwdt010_wdt, wdd);
 }
 
-static int ftwdt010_wdt_start(struct watchdog_device *wdd)
+static void ftwdt010_enable(struct ftwdt010_wdt *gwdt,
+			    unsigned int timeout,
+			    bool need_irq)
 {
-	struct ftwdt010_wdt *gwdt = to_ftwdt010_wdt(wdd);
 	u32 enable;
 
-	writel(wdd->timeout * WDT_CLOCK, gwdt->base + FTWDT010_WDLOAD);
+	writel(timeout * WDT_CLOCK, gwdt->base + FTWDT010_WDLOAD);
 	writel(WDRESTART_MAGIC, gwdt->base + FTWDT010_WDRESTART);
 	/* set clock before enabling */
 	enable = WDCR_CLOCK_5MHZ | WDCR_SYS_RST;
 	writel(enable, gwdt->base + FTWDT010_WDCR);
-	if (gwdt->has_irq)
+	if (need_irq)
 		enable |= WDCR_WDINTR;
 	enable |= WDCR_ENABLE;
 	writel(enable, gwdt->base + FTWDT010_WDCR);
+}
 
+static int ftwdt010_wdt_start(struct watchdog_device *wdd)
+{
+	struct ftwdt010_wdt *gwdt = to_ftwdt010_wdt(wdd);
+
+	ftwdt010_enable(gwdt, wdd->timeout, gwdt->has_irq);
 	return 0;
 }
 
@@ -93,6 +100,13 @@ static int ftwdt010_wdt_set_timeout(struct watchdog_device *wdd,
 	return 0;
 }
 
+static int ftwdt010_wdt_restart(struct watchdog_device *wdd,
+				unsigned long action, void *data)
+{
+	ftwdt010_enable(to_ftwdt010_wdt(wdd), 0, false);
+	return 0;
+}
+
 static irqreturn_t ftwdt010_wdt_interrupt(int irq, void *data)
 {
 	struct ftwdt010_wdt *gwdt = data;
@@ -107,6 +121,7 @@ static const struct watchdog_ops ftwdt010_wdt_ops = {
 	.stop		= ftwdt010_wdt_stop,
 	.ping		= ftwdt010_wdt_ping,
 	.set_timeout	= ftwdt010_wdt_set_timeout,
+	.restart	= ftwdt010_wdt_restart,
 	.owner		= THIS_MODULE,
 };
 
@@ -156,7 +171,7 @@ static int ftwdt010_wdt_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq) {
+	if (irq > 0) {
 		ret = devm_request_irq(dev, irq, ftwdt010_wdt_interrupt, 0,
 				       "watchdog bark", gwdt);
 		if (ret)
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index a5006a58e0db..f79f932bca14 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -20,7 +20,9 @@
 #include <linux/pci_ids.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
+#ifdef CONFIG_HPWDT_NMI_DECODING
 #include <asm/nmi.h>
+#endif
 #include <linux/crash_dump.h>
 
 #define HPWDT_VERSION			"2.0.4"
diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
index 922b60374295..2897902090b3 100644
--- a/drivers/watchdog/imx7ulp_wdt.c
+++ b/drivers/watchdog/imx7ulp_wdt.c
@@ -9,12 +9,15 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
 #include <linux/watchdog.h>
 
 #define WDOG_CS			0x0
+#define WDOG_CS_FLG		BIT(14)
 #define WDOG_CS_CMD32EN		BIT(13)
+#define WDOG_CS_PRES		BIT(12)
 #define WDOG_CS_ULK		BIT(11)
 #define WDOG_CS_RCS		BIT(10)
 #define LPO_CLK			0x1
@@ -39,60 +42,105 @@
 #define DEFAULT_TIMEOUT	60
 #define MAX_TIMEOUT	128
 #define WDOG_CLOCK_RATE	1000
-#define WDOG_WAIT_TIMEOUT	20
+#define WDOG_ULK_WAIT_TIMEOUT	1000
+#define WDOG_RCS_WAIT_TIMEOUT	10000
+#define WDOG_RCS_POST_WAIT 3000
+
+#define RETRY_MAX 5
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, bool, 0000);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
+struct imx_wdt_hw_feature {
+	bool prescaler_enable;
+	u32 wdog_clock_rate;
+};
+
 struct imx7ulp_wdt_device {
 	struct watchdog_device wdd;
 	void __iomem *base;
 	struct clk *clk;
+	bool post_rcs_wait;
+	const struct imx_wdt_hw_feature *hw;
 };
 
-static int imx7ulp_wdt_wait(void __iomem *base, u32 mask)
+static int imx7ulp_wdt_wait_ulk(void __iomem *base)
 {
 	u32 val = readl(base + WDOG_CS);
 
-	if (!(val & mask) && readl_poll_timeout_atomic(base + WDOG_CS, val,
-						       val & mask, 0,
-						       WDOG_WAIT_TIMEOUT))
+	if (!(val & WDOG_CS_ULK) &&
+	    readl_poll_timeout_atomic(base + WDOG_CS, val,
+				      val & WDOG_CS_ULK, 0,
+				      WDOG_ULK_WAIT_TIMEOUT))
 		return -ETIMEDOUT;
 
 	return 0;
 }
 
-static int imx7ulp_wdt_enable(struct watchdog_device *wdog, bool enable)
+static int imx7ulp_wdt_wait_rcs(struct imx7ulp_wdt_device *wdt)
 {
-	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+	int ret = 0;
+	u32 val = readl(wdt->base + WDOG_CS);
+	u64 timeout = (val & WDOG_CS_PRES) ?
+		WDOG_RCS_WAIT_TIMEOUT * 256 : WDOG_RCS_WAIT_TIMEOUT;
+	unsigned long wait_min = (val & WDOG_CS_PRES) ?
+		WDOG_RCS_POST_WAIT * 256 : WDOG_RCS_POST_WAIT;
+
+	if (!(val & WDOG_CS_RCS) &&
+	    readl_poll_timeout(wdt->base + WDOG_CS, val, val & WDOG_CS_RCS, 100,
+			       timeout))
+		ret = -ETIMEDOUT;
+
+	/* Wait 2.5 clocks after RCS done */
+	if (wdt->post_rcs_wait)
+		usleep_range(wait_min, wait_min + 2000);
+
+	return ret;
+}
 
+static int _imx7ulp_wdt_enable(struct imx7ulp_wdt_device *wdt, bool enable)
+{
 	u32 val = readl(wdt->base + WDOG_CS);
 	int ret;
 
 	local_irq_disable();
 	writel(UNLOCK, wdt->base + WDOG_CNT);
-	ret = imx7ulp_wdt_wait(wdt->base, WDOG_CS_ULK);
+	ret = imx7ulp_wdt_wait_ulk(wdt->base);
 	if (ret)
 		goto enable_out;
 	if (enable)
 		writel(val | WDOG_CS_EN, wdt->base + WDOG_CS);
 	else
 		writel(val & ~WDOG_CS_EN, wdt->base + WDOG_CS);
-	imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
 
-enable_out:
 	local_irq_enable();
+	ret = imx7ulp_wdt_wait_rcs(wdt);
 
 	return ret;
+
+enable_out:
+	local_irq_enable();
+	return ret;
 }
 
-static bool imx7ulp_wdt_is_enabled(void __iomem *base)
+static int imx7ulp_wdt_enable(struct watchdog_device *wdog, bool enable)
 {
-	u32 val = readl(base + WDOG_CS);
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+	int ret;
+	u32 val;
+	u32 loop = RETRY_MAX;
+
+	do {
+		ret = _imx7ulp_wdt_enable(wdt, enable);
+		val = readl(wdt->base + WDOG_CS);
+	} while (--loop > 0 && ((!!(val & WDOG_CS_EN)) != enable || ret));
 
-	return val & WDOG_CS_EN;
+	if (loop == 0)
+		return -EBUSY;
+
+	return ret;
 }
 
 static int imx7ulp_wdt_ping(struct watchdog_device *wdog)
@@ -114,26 +162,44 @@ static int imx7ulp_wdt_stop(struct watchdog_device *wdog)
 	return imx7ulp_wdt_enable(wdog, false);
 }
 
-static int imx7ulp_wdt_set_timeout(struct watchdog_device *wdog,
-				   unsigned int timeout)
+static int _imx7ulp_wdt_set_timeout(struct imx7ulp_wdt_device *wdt,
+				   unsigned int toval)
 {
-	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
-	u32 val = WDOG_CLOCK_RATE * timeout;
 	int ret;
 
 	local_irq_disable();
 	writel(UNLOCK, wdt->base + WDOG_CNT);
-	ret = imx7ulp_wdt_wait(wdt->base, WDOG_CS_ULK);
+	ret = imx7ulp_wdt_wait_ulk(wdt->base);
 	if (ret)
 		goto timeout_out;
-	writel(val, wdt->base + WDOG_TOVAL);
-	imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
-
-	wdog->timeout = timeout;
+	writel(toval, wdt->base + WDOG_TOVAL);
+	local_irq_enable();
+	ret = imx7ulp_wdt_wait_rcs(wdt);
+	return ret;
 
 timeout_out:
 	local_irq_enable();
+	return ret;
+}
 
+static int imx7ulp_wdt_set_timeout(struct watchdog_device *wdog,
+				   unsigned int timeout)
+{
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+	u32 toval = wdt->hw->wdog_clock_rate * timeout;
+	u32 val;
+	int ret;
+	u32 loop = RETRY_MAX;
+
+	do {
+		ret = _imx7ulp_wdt_set_timeout(wdt, toval);
+		val = readl(wdt->base + WDOG_TOVAL);
+	} while (--loop > 0 && (val != toval || ret));
+
+	if (loop == 0)
+		return -EBUSY;
+
+	wdog->timeout = timeout;
 	return ret;
 }
 
@@ -173,29 +239,62 @@ static const struct watchdog_info imx7ulp_wdt_info = {
 		    WDIOF_MAGICCLOSE,
 };
 
-static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
+static int _imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout, unsigned int cs)
 {
 	u32 val;
 	int ret;
 
 	local_irq_disable();
-	/* unlock the wdog for reconfiguration */
-	writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
-	writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
-	ret = imx7ulp_wdt_wait(base, WDOG_CS_ULK);
+
+	val = readl(wdt->base + WDOG_CS);
+	if (val & WDOG_CS_CMD32EN) {
+		writel(UNLOCK, wdt->base + WDOG_CNT);
+	} else {
+		mb();
+		/* unlock the wdog for reconfiguration */
+		writel_relaxed(UNLOCK_SEQ0, wdt->base + WDOG_CNT);
+		writel_relaxed(UNLOCK_SEQ1, wdt->base + WDOG_CNT);
+		mb();
+	}
+
+	ret = imx7ulp_wdt_wait_ulk(wdt->base);
 	if (ret)
 		goto init_out;
 
 	/* set an initial timeout value in TOVAL */
-	writel(timeout, base + WDOG_TOVAL);
-	/* enable 32bit command sequence and reconfigure */
-	val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE |
-	      WDOG_CS_WAIT | WDOG_CS_STOP;
-	writel(val, base + WDOG_CS);
-	imx7ulp_wdt_wait(base, WDOG_CS_RCS);
+	writel(timeout, wdt->base + WDOG_TOVAL);
+	writel(cs, wdt->base + WDOG_CS);
+	local_irq_enable();
+	ret = imx7ulp_wdt_wait_rcs(wdt);
+
+	return ret;
 
 init_out:
 	local_irq_enable();
+	return ret;
+}
+
+static int imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout)
+{
+	/* enable 32bit command sequence and reconfigure */
+	u32 val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE |
+		  WDOG_CS_WAIT | WDOG_CS_STOP;
+	u32 cs, toval;
+	int ret;
+	u32 loop = RETRY_MAX;
+
+	if (wdt->hw->prescaler_enable)
+		val |= WDOG_CS_PRES;
+
+	do {
+		ret = _imx7ulp_wdt_init(wdt, timeout, val);
+		toval = readl(wdt->base + WDOG_TOVAL);
+		cs = readl(wdt->base + WDOG_CS);
+		cs &= ~(WDOG_CS_FLG | WDOG_CS_ULK | WDOG_CS_RCS);
+	} while (--loop > 0 && (cs != val || toval != timeout || ret));
+
+	if (loop == 0)
+		return -EBUSY;
 
 	return ret;
 }
@@ -228,6 +327,15 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
 		return PTR_ERR(imx7ulp_wdt->clk);
 	}
 
+	imx7ulp_wdt->post_rcs_wait = true;
+	if (of_device_is_compatible(dev->of_node,
+				    "fsl,imx8ulp-wdt")) {
+		dev_info(dev, "imx8ulp wdt probe\n");
+		imx7ulp_wdt->post_rcs_wait = false;
+	} else {
+		dev_info(dev, "imx7ulp wdt probe\n");
+	}
+
 	ret = clk_prepare_enable(imx7ulp_wdt->clk);
 	if (ret)
 		return ret;
@@ -248,14 +356,16 @@ static int imx7ulp_wdt_probe(struct platform_device *pdev)
 	watchdog_stop_on_reboot(wdog);
 	watchdog_stop_on_unregister(wdog);
 	watchdog_set_drvdata(wdog, imx7ulp_wdt);
-	ret = imx7ulp_wdt_init(imx7ulp_wdt->base, wdog->timeout * WDOG_CLOCK_RATE);
+
+	imx7ulp_wdt->hw = of_device_get_match_data(dev);
+	ret = imx7ulp_wdt_init(imx7ulp_wdt, wdog->timeout * imx7ulp_wdt->hw->wdog_clock_rate);
 	if (ret)
 		return ret;
 
 	return devm_watchdog_register_device(dev, wdog);
 }
 
-static int __maybe_unused imx7ulp_wdt_suspend(struct device *dev)
+static int __maybe_unused imx7ulp_wdt_suspend_noirq(struct device *dev)
 {
 	struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
 
@@ -267,30 +377,44 @@ static int __maybe_unused imx7ulp_wdt_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused imx7ulp_wdt_resume(struct device *dev)
+static int __maybe_unused imx7ulp_wdt_resume_noirq(struct device *dev)
 {
 	struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
-	u32 timeout = imx7ulp_wdt->wdd.timeout * WDOG_CLOCK_RATE;
+	u32 timeout = imx7ulp_wdt->wdd.timeout * imx7ulp_wdt->hw->wdog_clock_rate;
 	int ret;
 
 	ret = clk_prepare_enable(imx7ulp_wdt->clk);
 	if (ret)
 		return ret;
 
-	if (imx7ulp_wdt_is_enabled(imx7ulp_wdt->base))
-		imx7ulp_wdt_init(imx7ulp_wdt->base, timeout);
-
-	if (watchdog_active(&imx7ulp_wdt->wdd))
+	if (watchdog_active(&imx7ulp_wdt->wdd)) {
+		imx7ulp_wdt_init(imx7ulp_wdt, timeout);
 		imx7ulp_wdt_start(&imx7ulp_wdt->wdd);
+		imx7ulp_wdt_ping(&imx7ulp_wdt->wdd);
+	}
 
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(imx7ulp_wdt_pm_ops, imx7ulp_wdt_suspend,
-			 imx7ulp_wdt_resume);
+static const struct dev_pm_ops imx7ulp_wdt_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx7ulp_wdt_suspend_noirq,
+				      imx7ulp_wdt_resume_noirq)
+};
+
+static const struct imx_wdt_hw_feature imx7ulp_wdt_hw = {
+	.prescaler_enable = false,
+	.wdog_clock_rate = 1000,
+};
+
+static const struct imx_wdt_hw_feature imx93_wdt_hw = {
+	.prescaler_enable = true,
+	.wdog_clock_rate = 125,
+};
 
 static const struct of_device_id imx7ulp_wdt_dt_ids[] = {
-	{ .compatible = "fsl,imx7ulp-wdt", },
+	{ .compatible = "fsl,imx8ulp-wdt", .data = &imx7ulp_wdt_hw, },
+	{ .compatible = "fsl,imx7ulp-wdt", .data = &imx7ulp_wdt_hw, },
+	{ .compatible = "fsl,imx93-wdt", .data = &imx93_wdt_hw, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx7ulp_wdt_dt_ids);
diff --git a/drivers/watchdog/meson_gxbb_wdt.c b/drivers/watchdog/meson_gxbb_wdt.c
index d3c9e2f6e63b..981a2f7c3bec 100644
--- a/drivers/watchdog/meson_gxbb_wdt.c
+++ b/drivers/watchdog/meson_gxbb_wdt.c
@@ -156,6 +156,7 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct meson_gxbb_wdt *data;
 	int ret;
+	u32 ctrl_reg;
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
@@ -189,13 +190,26 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev)
 	watchdog_set_nowayout(&data->wdt_dev, nowayout);
 	watchdog_set_drvdata(&data->wdt_dev, data);
 
+	ctrl_reg = readl(data->reg_base + GXBB_WDT_CTRL_REG) &
+				GXBB_WDT_CTRL_EN;
+
+	if (ctrl_reg) {
+		/* Watchdog is running - keep it running but extend timeout
+		 * to the maximum while setting the timebase
+		 */
+		set_bit(WDOG_HW_RUNNING, &data->wdt_dev.status);
+		meson_gxbb_wdt_set_timeout(&data->wdt_dev,
+				GXBB_WDT_TCNT_SETUP_MASK / 1000);
+	}
+
 	/* Setup with 1ms timebase */
-	writel(((clk_get_rate(data->clk) / 1000) & GXBB_WDT_CTRL_DIV_MASK) |
-		GXBB_WDT_CTRL_EE_RESET |
-		GXBB_WDT_CTRL_CLK_EN |
-		GXBB_WDT_CTRL_CLKDIV_EN,
-		data->reg_base + GXBB_WDT_CTRL_REG);
+	ctrl_reg |= ((clk_get_rate(data->clk) / 1000) &
+			GXBB_WDT_CTRL_DIV_MASK) |
+			GXBB_WDT_CTRL_EE_RESET |
+			GXBB_WDT_CTRL_CLK_EN |
+			GXBB_WDT_CTRL_CLKDIV_EN;
 
+	writel(ctrl_reg, data->reg_base + GXBB_WDT_CTRL_REG);
 	meson_gxbb_wdt_set_timeout(&data->wdt_dev, data->wdt_dev.timeout);
 
 	return devm_watchdog_register_device(dev, &data->wdt_dev);
diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
index 28a24caa2627..a5dd1c230137 100644
--- a/drivers/watchdog/npcm_wdt.c
+++ b/drivers/watchdog/npcm_wdt.c
@@ -3,6 +3,7 @@
 // Copyright (c) 2018 IBM Corp.
 
 #include <linux/bitops.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -43,6 +44,7 @@
 struct npcm_wdt {
 	struct watchdog_device  wdd;
 	void __iomem		*reg;
+	struct clk		*clk;
 };
 
 static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd)
@@ -66,6 +68,9 @@ static int npcm_wdt_start(struct watchdog_device *wdd)
 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
 	u32 val;
 
+	if (wdt->clk)
+		clk_prepare_enable(wdt->clk);
+
 	if (wdd->timeout < 2)
 		val = 0x800;
 	else if (wdd->timeout < 3)
@@ -100,6 +105,9 @@ static int npcm_wdt_stop(struct watchdog_device *wdd)
 
 	writel(0, wdt->reg);
 
+	if (wdt->clk)
+		clk_disable_unprepare(wdt->clk);
+
 	return 0;
 }
 
@@ -147,6 +155,10 @@ static int npcm_wdt_restart(struct watchdog_device *wdd,
 {
 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);
 
+	/* For reset, we start the WDT clock and leave it running. */
+	if (wdt->clk)
+		clk_prepare_enable(wdt->clk);
+
 	writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, wdt->reg);
 	udelay(1000);
 
@@ -191,6 +203,10 @@ static int npcm_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(wdt->reg))
 		return PTR_ERR(wdt->reg);
 
+	wdt->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(wdt->clk))
+		return PTR_ERR(wdt->clk);
+
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c
index 053ef3bde12d..6e9253761fc1 100644
--- a/drivers/watchdog/rti_wdt.c
+++ b/drivers/watchdog/rti_wdt.c
@@ -225,9 +225,8 @@ static int rti_wdt_probe(struct platform_device *pdev)
 		wdt->freq = wdt->freq * 9 / 10;
 
 	pm_runtime_enable(dev);
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0) {
-		pm_runtime_put_noidle(dev);
 		pm_runtime_disable(&pdev->dev);
 		return dev_err_probe(dev, ret, "runtime pm failed\n");
 	}
diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
index 6eea0ee4af49..974a4194a8fd 100644
--- a/drivers/watchdog/rzg2l_wdt.c
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -10,7 +10,7 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -40,6 +40,11 @@ module_param(nowayout, bool, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
+enum rz_wdt_type {
+	WDT_RZG2L,
+	WDT_RZV2M,
+};
+
 struct rzg2l_wdt_priv {
 	void __iomem *base;
 	struct watchdog_device wdev;
@@ -48,6 +53,7 @@ struct rzg2l_wdt_priv {
 	unsigned long delay;
 	struct clk *pclk;
 	struct clk *osc_clk;
+	enum rz_wdt_type devtype;
 };
 
 static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv)
@@ -142,11 +148,29 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev,
 	clk_prepare_enable(priv->pclk);
 	clk_prepare_enable(priv->osc_clk);
 
-	/* Generate Reset (WDTRSTB) Signal on parity error */
-	rzg2l_wdt_write(priv, 0, PECR);
+	if (priv->devtype == WDT_RZG2L) {
+		/* Generate Reset (WDTRSTB) Signal on parity error */
+		rzg2l_wdt_write(priv, 0, PECR);
+
+		/* Force parity error */
+		rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
+	} else {
+		/* RZ/V2M doesn't have parity error registers */
+
+		wdev->timeout = 0;
+
+		/* Initialize time out */
+		rzg2l_wdt_init_timeout(wdev);
 
-	/* Force parity error */
-	rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
+		/* Initialize watchdog counter register */
+		rzg2l_wdt_write(priv, 0, WDTTIM);
+
+		/* Enable watchdog timer*/
+		rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT);
+
+		/* Wait 2 consecutive overflow cycles for reset */
+		mdelay(DIV_ROUND_UP(2 * 0xFFFFF * 1000, priv->osc_clk_rate));
+	}
 
 	return 0;
 }
@@ -227,6 +251,8 @@ static int rzg2l_wdt_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to deassert");
 
+	priv->devtype = (uintptr_t)of_device_get_match_data(dev);
+
 	pm_runtime_enable(&pdev->dev);
 
 	priv->wdev.info = &rzg2l_wdt_ident;
@@ -255,7 +281,8 @@ static int rzg2l_wdt_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id rzg2l_wdt_ids[] = {
-	{ .compatible = "renesas,rzg2l-wdt", },
+	{ .compatible = "renesas,rzg2l-wdt", .data = (void *)WDT_RZG2L },
+	{ .compatible = "renesas,rzv2m-wdt", .data = (void *)WDT_RZV2M },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rzg2l_wdt_ids);
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 95919392927f..d3fc8ed886ff 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -60,9 +60,13 @@
 #define EXYNOS850_CLUSTER0_NONCPU_INT_EN	0x1244
 #define EXYNOS850_CLUSTER1_NONCPU_OUT		0x1620
 #define EXYNOS850_CLUSTER1_NONCPU_INT_EN	0x1644
+#define EXYNOSAUTOV9_CLUSTER1_NONCPU_OUT	0x1520
+#define EXYNOSAUTOV9_CLUSTER1_NONCPU_INT_EN	0x1544
 
 #define EXYNOS850_CLUSTER0_WDTRESET_BIT		24
 #define EXYNOS850_CLUSTER1_WDTRESET_BIT		23
+#define EXYNOSAUTOV9_CLUSTER0_WDTRESET_BIT	25
+#define EXYNOSAUTOV9_CLUSTER1_WDTRESET_BIT	24
 
 /**
  * DOC: Quirk flags for different Samsung watchdog IP-cores
@@ -236,6 +240,30 @@ static const struct s3c2410_wdt_variant drv_data_exynos850_cl1 = {
 		  QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
 };
 
+static const struct s3c2410_wdt_variant drv_data_exynosautov9_cl0 = {
+	.mask_reset_reg = EXYNOS850_CLUSTER0_NONCPU_INT_EN,
+	.mask_bit = 2,
+	.mask_reset_inv = true,
+	.rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+	.rst_stat_bit = EXYNOSAUTOV9_CLUSTER0_WDTRESET_BIT,
+	.cnt_en_reg = EXYNOS850_CLUSTER0_NONCPU_OUT,
+	.cnt_en_bit = 7,
+	.quirks = QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_PMU_MASK_RESET |
+		  QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
+};
+
+static const struct s3c2410_wdt_variant drv_data_exynosautov9_cl1 = {
+	.mask_reset_reg = EXYNOSAUTOV9_CLUSTER1_NONCPU_INT_EN,
+	.mask_bit = 2,
+	.mask_reset_inv = true,
+	.rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
+	.rst_stat_bit = EXYNOSAUTOV9_CLUSTER1_WDTRESET_BIT,
+	.cnt_en_reg = EXYNOSAUTOV9_CLUSTER1_NONCPU_OUT,
+	.cnt_en_bit = 7,
+	.quirks = QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_PMU_MASK_RESET |
+		  QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
+};
+
 static const struct of_device_id s3c2410_wdt_match[] = {
 	{ .compatible = "samsung,s3c2410-wdt",
 	  .data = &drv_data_s3c2410 },
@@ -249,6 +277,8 @@ static const struct of_device_id s3c2410_wdt_match[] = {
 	  .data = &drv_data_exynos7 },
 	{ .compatible = "samsung,exynos850-wdt",
 	  .data = &drv_data_exynos850_cl0 },
+	{ .compatible = "samsung,exynosautov9-wdt",
+	  .data = &drv_data_exynosautov9_cl0 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
@@ -630,8 +660,9 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev)
 	}
 
 #ifdef CONFIG_OF
-	/* Choose Exynos850 driver data w.r.t. cluster index */
-	if (variant == &drv_data_exynos850_cl0) {
+	/* Choose Exynos850/ExynosAutov9 driver data w.r.t. cluster index */
+	if (variant == &drv_data_exynos850_cl0 ||
+	    variant == &drv_data_exynosautov9_cl0) {
 		u32 index;
 		int err;
 
@@ -644,9 +675,11 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev)
 
 		switch (index) {
 		case 0:
-			return &drv_data_exynos850_cl0;
+			return variant;
 		case 1:
-			return &drv_data_exynos850_cl1;
+			return (variant == &drv_data_exynos850_cl0) ?
+				&drv_data_exynos850_cl1 :
+				&drv_data_exynosautov9_cl1;
 		default:
 			dev_err(dev, "wrong cluster index: %u\n", index);
 			return NULL;
diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index 2d0a06a158a8..82ac5d19f519 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -238,7 +238,7 @@ static int sa1100dog_remove(struct platform_device *pdev)
 	return 0;
 }
 
-struct platform_driver sa1100dog_driver = {
+static struct platform_driver sa1100dog_driver = {
 	.driver.name = "sa1100_wdt",
 	.probe	  = sa1100dog_probe,
 	.remove	  = sa1100dog_remove,
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index ae54dd33e233..fb426b7d81da 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -65,6 +65,12 @@ static struct pci_dev *sp5100_tco_pci;
 
 /* module parameters */
 
+#define WATCHDOG_ACTION 0
+static bool action = WATCHDOG_ACTION;
+module_param(action, bool, 0);
+MODULE_PARM_DESC(action, "Action taken when watchdog expires, 0 to reset, 1 to poweroff (default="
+		 __MODULE_STRING(WATCHDOG_ACTION) ")");
+
 #define WATCHDOG_HEARTBEAT 60	/* 60 sec default heartbeat. */
 static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
 module_param(heartbeat, int, 0);
@@ -297,8 +303,11 @@ static int sp5100_tco_timer_init(struct sp5100_tco *tco)
 	if (val & SP5100_WDT_FIRED)
 		wdd->bootstatus = WDIOF_CARDRESET;
 
-	/* Set watchdog action to reset the system */
-	val &= ~SP5100_WDT_ACTION_RESET;
+	/* Set watchdog action */
+	if (action)
+		val |= SP5100_WDT_ACTION_RESET;
+	else
+		val &= ~SP5100_WDT_ACTION_RESET;
 	writel(val, SP5100_WDT_CONTROL(tco->tcobase));
 
 	/* Set a reasonable heartbeat before we stop the timer */
diff --git a/drivers/watchdog/twl4030_wdt.c b/drivers/watchdog/twl4030_wdt.c
index 355e428c0b99..36b4a660928d 100644
--- a/drivers/watchdog/twl4030_wdt.c
+++ b/drivers/watchdog/twl4030_wdt.c
@@ -9,6 +9,7 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/watchdog.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/twl.h>
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 56a4a4030ca9..bc33b63c5a5d 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -113,6 +113,10 @@ MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)");
 #define W836X7HF_WDT_CSR	0xf7
 #define NCT6102D_WDT_CSR	0xf2
 
+#define WDT_CSR_STATUS		0x10
+#define WDT_CSR_KBD		0x40
+#define WDT_CSR_MOUSE		0x80
+
 static void superio_outb(int reg, int val)
 {
 	outb(reg, WDT_EFER);
@@ -244,8 +248,12 @@ static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
 	t = superio_inb(cr_wdt_control) & ~0x0C;
 	superio_outb(cr_wdt_control, t);
 
-	/* reset trigger, disable keyboard & mouse turning off watchdog */
-	t = superio_inb(cr_wdt_csr) & ~0xD0;
+	t = superio_inb(cr_wdt_csr);
+	if (t & WDT_CSR_STATUS)
+		wdog->bootstatus |= WDIOF_CARDRESET;
+
+	/* reset status, disable keyboard & mouse turning off watchdog */
+	t &= ~(WDT_CSR_STATUS | WDT_CSR_KBD | WDT_CSR_MOUSE);
 	superio_outb(cr_wdt_csr, t);
 
 	superio_exit();
diff --git a/drivers/watchdog/w83977f_wdt.c b/drivers/watchdog/w83977f_wdt.c
index fd64ae77780a..31bf21ceaf48 100644
--- a/drivers/watchdog/w83977f_wdt.c
+++ b/drivers/watchdog/w83977f_wdt.c
@@ -321,7 +321,7 @@ static int wdt_release(struct inode *inode, struct file *file)
  *      @ppos: pointer to the position to write. No seeks allowed
  *
  *      A write to a watchdog device is defined as a keepalive signal. Any
- *      write of data will do, as we we don't define content meaning.
+ *      write of data will do, as we don't define content meaning.
  */
 
 static ssize_t wdt_write(struct file *file, const char __user *buf,
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 54903f3c851e..744b2ab75288 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -1015,7 +1015,11 @@ static int watchdog_cdev_register(struct watchdog_device *wdd)
 	wd_data->dev.groups = wdd->groups;
 	wd_data->dev.release = watchdog_core_data_release;
 	dev_set_drvdata(&wd_data->dev, wdd);
-	dev_set_name(&wd_data->dev, "watchdog%d", wdd->id);
+	err = dev_set_name(&wd_data->dev, "watchdog%d", wdd->id);
+	if (err) {
+		put_device(&wd_data->dev);
+		return err;
+	}
 
 	kthread_init_work(&wd_data->work, watchdog_ping_work);
 	hrtimer_init(&wd_data->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
index aeadaa07c891..ce7a4a9e4b03 100644
--- a/drivers/watchdog/wdat_wdt.c
+++ b/drivers/watchdog/wdat_wdt.c
@@ -342,9 +342,8 @@ static int wdat_wdt_probe(struct platform_device *pdev)
 		return -EINVAL;
 
 	wdat->period = tbl->timer_period;
-	wdat->wdd.min_hw_heartbeat_ms = wdat->period * tbl->min_count;
-	wdat->wdd.max_hw_heartbeat_ms = wdat->period * tbl->max_count;
-	wdat->wdd.min_timeout = 1;
+	wdat->wdd.min_timeout = DIV_ROUND_UP(wdat->period * tbl->min_count, 1000);
+	wdat->wdd.max_timeout = wdat->period * tbl->max_count / 1000;
 	wdat->stopped_in_sleep = tbl->flags & ACPI_WDAT_STOPPED;
 	wdat->wdd.info = &wdat_wdt_info;
 	wdat->wdd.ops = &wdat_wdt_ops;