From 04868b407b624c414805c9e9a79195eeb3a14829 Mon Sep 17 00:00:00 2001
From: Mateusz Kulikowski
Date: Thu, 31 Mar 2016 23:12:27 +0200
Subject: drivers: Add SPMI bus uclass

Qualcom processors use proprietary bus to talk with PMIC devices -
SPMI (System Power Management Interface).
On wiring level it is similar to I2C, but on protocol level, it's
multi-master and has simple autodetection capabilities.
This commit adds simple uclass that provides bus read/write interface.

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
---
 drivers/spmi/Kconfig       | 10 ++++++++++
 drivers/spmi/Makefile      |  7 +++++++
 drivers/spmi/spmi-uclass.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 drivers/spmi/Kconfig
 create mode 100644 drivers/spmi/Makefile
 create mode 100644 drivers/spmi/spmi-uclass.c

(limited to 'drivers/spmi')

diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig
new file mode 100644
index 00000000000..0b9bd312063
--- /dev/null
+++ b/drivers/spmi/Kconfig
@@ -0,0 +1,10 @@
+menu "SPMI support"
+
+config SPMI
+	bool "Enable SPMI bus support"
+	depends on DM
+	---help---
+	  Select this to enable to support SPMI bus.
+	  SPMI (System Power Management Interface) bus is used
+	  to connect PMIC devices on various SoCs.
+endmenu
diff --git a/drivers/spmi/Makefile b/drivers/spmi/Makefile
new file mode 100644
index 00000000000..99092eba534
--- /dev/null
+++ b/drivers/spmi/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_SPMI)  += spmi-uclass.o
diff --git a/drivers/spmi/spmi-uclass.c b/drivers/spmi/spmi-uclass.c
new file mode 100644
index 00000000000..4ddd51b556e
--- /dev/null
+++ b/drivers/spmi/spmi-uclass.c
@@ -0,0 +1,48 @@
+/*
+ * SPMI bus uclass driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/root.h>
+#include <spmi/spmi.h>
+#include <linux/ctype.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int spmi_reg_read(struct udevice *dev, int usid, int pid, int reg)
+{
+	const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+	if (!ops || !ops->read)
+		return -ENOSYS;
+
+	return ops->read(dev, usid, pid, reg);
+}
+
+int spmi_reg_write(struct udevice *dev, int usid, int pid, int reg,
+		   uint8_t value)
+{
+	const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+	if (!ops || !ops->write)
+		return -ENOSYS;
+
+	return ops->write(dev, usid, pid, reg, value);
+}
+
+static int spmi_post_bind(struct udevice *dev)
+{
+	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+UCLASS_DRIVER(spmi) = {
+	.id		= UCLASS_SPMI,
+	.name		= "spmi",
+	.post_bind	= spmi_post_bind,
+};
-- 
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