Merge git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:
 "This includes some fixes and code improvements (like
  clk_prepare_enable and clk_disable_unprepare), conversion from the
  omap_wdt and twl4030_wdt drivers to the watchdog framework, addition
  of the SB8x0 chipset support and the DA9055 Watchdog driver and some
  OF support for the davinci_wdt driver."

* git://www.linux-watchdog.org/linux-watchdog: (22 commits)
  watchdog: mei: avoid oops in watchdog unregister code path
  watchdog: Orion: Fix possible null-deference in orion_wdt_probe
  watchdog: sp5100_tco: Add SB8x0 chipset support
  watchdog: davinci_wdt: add OF support
  watchdog: da9052: Fix invalid free of devm_ allocated data
  watchdog: twl4030_wdt: Change TWL4030_MODULE_PM_RECEIVER to TWL_MODULE_PM_RECEIVER
  watchdog: remove depends on CONFIG_EXPERIMENTAL
  watchdog: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  watchdog: DA9055 Watchdog driver
  watchdog: omap_wdt: eliminate goto
  watchdog: omap_wdt: delete redundant platform_set_drvdata() calls
  watchdog: omap_wdt: convert to devm_ functions
  watchdog: omap_wdt: convert to new watchdog core
  watchdog: WatchDog Timer Driver Core: fix comment
  watchdog: s3c2410_wdt: use clk_prepare_enable and clk_disable_unprepare
  watchdog: imx2_wdt: Select the driver via ARCH_MXC
  watchdog: cpu5wdt.c: add missing del_timer call
  watchdog: hpwdt.c: Increase version string
  watchdog: Convert twl4030_wdt to watchdog core
  davinci_wdt: preparation for switch to common clock framework
  ...

19 files changed, 738 insertions, 445 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/davinci-wdt.txt b/Documentation/devicetree/bindings/watchdog/davinci-wdt.txt
new file mode 100644
index 00000000000..75558ccd9a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/davinci-wdt.txt
@@ -0,0 +1,12 @@
+DaVinci Watchdog Timer (WDT) Controller
+
+Required properties:
+- compatible : Should be "ti,davinci-wdt"
+- reg : Should contain WDT registers location and length
+
+Examples:
+
+wdt: wdt@2320000 {
+	compatible = "ti,davinci-wdt";
+	reg = <0x02320000 0x80>;
+};
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 636409f9667..9299a8c29a6 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -370,7 +370,7 @@ void mei_watchdog_register(struct mei_device *dev)
 
 void mei_watchdog_unregister(struct mei_device *dev)
 {
-	if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
+	if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
 		return;
 
 	watchdog_set_drvdata(&amt_wd_dev, NULL);
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index ad1bb9382a9..7f809fd4a57 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -76,6 +76,16 @@ config DA9052_WATCHDOG
           Alternatively say M to compile the driver as a module,
           which will be called da9052_wdt.
 
+config DA9055_WATCHDOG
+	tristate "Dialog Semiconductor DA9055 Watchdog"
+	depends on MFD_DA9055
+	help
+	  If you say yes here you get support for watchdog on the Dialog
+	  Semiconductor DA9055 PMIC.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called da9055_wdt.
+
 config WM831X_WATCHDOG
 	tristate "WM831x watchdog"
 	depends on MFD_WM831X
@@ -232,6 +242,7 @@ config EP93XX_WATCHDOG
 config OMAP_WATCHDOG
 	tristate "OMAP Watchdog"
 	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
+	select WATCHDOG_CORE
 	help
 	  Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog.  Say 'Y'
 	  here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog timer.
@@ -300,6 +311,7 @@ config COH901327_WATCHDOG
 config TWL4030_WATCHDOG
 	tristate "TWL4030 Watchdog"
 	depends on TWL4030_CORE
+	select WATCHDOG_CORE
 	help
 	  Support for TI TWL4030 watchdog.  Say 'Y' here to enable the
 	  watchdog timer support for TWL4030 chips.
@@ -342,7 +354,7 @@ config MAX63XX_WATCHDOG
 
 config IMX2_WDT
 	tristate "IMX2+ Watchdog"
-	depends on IMX_HAVE_PLATFORM_IMX2_WDT
+	depends on ARCH_MXC
 	help
 	  This is the driver for the hardware watchdog
 	  on the Freescale IMX2 and later processors.
@@ -431,7 +443,7 @@ config ALIM7101_WDT
 
 config F71808E_WDT
 	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
-	depends on X86 && EXPERIMENTAL
+	depends on X86
 	help
 	  This is the driver for the hardware watchdog on the Fintek
 	  F71808E, F71862FG, F71869, F71882FG and F71889FG Super I/O controllers.
@@ -622,7 +634,7 @@ config IT8712F_WDT
 
 config IT87_WDT
 	tristate "IT87 Watchdog Timer"
-	depends on X86 && EXPERIMENTAL
+	depends on X86
 	---help---
 	  This is the driver for the hardware watchdog on the ITE IT8702,
 	  IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 572b39bed06..97bbdb3a464 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -164,6 +164,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 
 # Architecture Independent
 obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
+obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
 obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
 obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
 obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
index 7c8ede7816b..38a999e60c0 100644
--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -284,6 +284,7 @@ static void ath97_wdt_shutdown(struct platform_device *pdev)
 }
 
 static struct platform_driver ath79_wdt_driver = {
+	.probe		= ath79_wdt_probe,
 	.remove		= ath79_wdt_remove,
 	.shutdown	= ath97_wdt_shutdown,
 	.driver		= {
@@ -292,17 +293,7 @@ static struct platform_driver ath79_wdt_driver = {
 	},
 };
 
-static int __init ath79_wdt_init(void)
-{
-	return platform_driver_probe(&ath79_wdt_driver, ath79_wdt_probe);
-}
-module_init(ath79_wdt_init);
-
-static void __exit ath79_wdt_exit(void)
-{
-	platform_driver_unregister(&ath79_wdt_driver);
-}
-module_exit(ath79_wdt_exit);
+module_platform_driver(ath79_wdt_driver);
 
 MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X hardware watchdog driver");
 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
diff --git a/drivers/watchdog/cpu5wdt.c b/drivers/watchdog/cpu5wdt.c
index cd87758abac..f270bb7bc45 100644
--- a/drivers/watchdog/cpu5wdt.c
+++ b/drivers/watchdog/cpu5wdt.c
@@ -266,6 +266,7 @@ static void cpu5wdt_exit(void)
 	if (cpu5wdt_device.queue) {
 		cpu5wdt_device.queue = 0;
 		wait_for_completion(&cpu5wdt_device.stop);
+		del_timer(&cpu5wdt_device.timer);
 	}
 
 	misc_deregister(&cpu5wdt_misc);
diff --git a/drivers/watchdog/da9052_wdt.c b/drivers/watchdog/da9052_wdt.c
index 8be70d8f268..367445009c6 100644
--- a/drivers/watchdog/da9052_wdt.c
+++ b/drivers/watchdog/da9052_wdt.c
@@ -53,10 +53,6 @@ static const struct {
 
 static void da9052_wdt_release_resources(struct kref *r)
 {
-	struct da9052_wdt_data *driver_data =
-		container_of(r, struct da9052_wdt_data, kref);
-
-	kfree(driver_data);
 }
 
 static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
diff --git a/drivers/watchdog/da9055_wdt.c b/drivers/watchdog/da9055_wdt.c
new file mode 100644
index 00000000000..709ea1aefeb
--- /dev/null
+++ b/drivers/watchdog/da9055_wdt.c
@@ -0,0 +1,216 @@
+/*
+ * System monitoring driver for DA9055 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+
+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) ")");
+
+#define DA9055_DEF_TIMEOUT	4
+#define DA9055_TWDMIN		256
+
+struct da9055_wdt_data {
+	struct watchdog_device wdt;
+	struct da9055 *da9055;
+	struct kref kref;
+};
+
+static const struct {
+	u8 reg_val;
+	int user_time;  /* In seconds */
+} da9055_wdt_maps[] = {
+	{ 0, 0 },
+	{ 1, 2 },
+	{ 2, 4 },
+	{ 3, 8 },
+	{ 4, 16 },
+	{ 5, 32 },
+	{ 5, 33 },  /* Actual time  32.768s so included both 32s and 33s */
+	{ 6, 65 },
+	{ 6, 66 },  /* Actual time 65.536s so include both, 65s and 66s */
+	{ 7, 131 },
+};
+
+static int da9055_wdt_set_timeout(struct watchdog_device *wdt_dev,
+				  unsigned int timeout)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+	struct da9055 *da9055 = driver_data->da9055;
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(da9055_wdt_maps); i++)
+		if (da9055_wdt_maps[i].user_time == timeout)
+			break;
+
+	if (i == ARRAY_SIZE(da9055_wdt_maps))
+		ret = -EINVAL;
+	else
+		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
+					DA9055_TWDSCALE_MASK,
+					da9055_wdt_maps[i].reg_val <<
+					DA9055_TWDSCALE_SHIFT);
+	if (ret < 0)
+		dev_err(da9055->dev,
+			"Failed to update timescale bit, %d\n", ret);
+
+	wdt_dev->timeout = timeout;
+
+	return ret;
+}
+
+static int da9055_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+	struct da9055 *da9055 = driver_data->da9055;
+	int ret;
+
+	/*
+	 * We have a minimum time for watchdog window called TWDMIN. A write
+	 * to the watchdog before this elapsed time will cause an error.
+	 */
+	mdelay(DA9055_TWDMIN);
+
+	/* Reset the watchdog timer */
+	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_E,
+				DA9055_WATCHDOG_MASK, 1);
+
+	return ret;
+}
+
+static void da9055_wdt_release_resources(struct kref *r)
+{
+	struct da9055_wdt_data *driver_data =
+		container_of(r, struct da9055_wdt_data, kref);
+
+	kfree(driver_data);
+}
+
+static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+	kref_get(&driver_data->kref);
+}
+
+static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+	kref_put(&driver_data->kref, da9055_wdt_release_resources);
+}
+
+static int da9055_wdt_start(struct watchdog_device *wdt_dev)
+{
+	return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+}
+
+static int da9055_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	return da9055_wdt_set_timeout(wdt_dev, 0);
+}
+
+static struct watchdog_info da9055_wdt_info = {
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity	= "DA9055 Watchdog",
+};
+
+static const struct watchdog_ops da9055_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = da9055_wdt_start,
+	.stop = da9055_wdt_stop,
+	.ping = da9055_wdt_ping,
+	.set_timeout = da9055_wdt_set_timeout,
+	.ref = da9055_wdt_ref,
+	.unref = da9055_wdt_unref,
+};
+
+static int da9055_wdt_probe(struct platform_device *pdev)
+{
+	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
+	struct da9055_wdt_data *driver_data;
+	struct watchdog_device *da9055_wdt;
+	int ret;
+
+	driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
+				   GFP_KERNEL);
+	if (!driver_data) {
+		dev_err(da9055->dev, "Failed to allocate watchdog device\n");
+		return -ENOMEM;
+	}
+
+	driver_data->da9055 = da9055;
+
+	da9055_wdt = &driver_data->wdt;
+
+	da9055_wdt->timeout = DA9055_DEF_TIMEOUT;
+	da9055_wdt->info = &da9055_wdt_info;
+	da9055_wdt->ops = &da9055_wdt_ops;
+	watchdog_set_nowayout(da9055_wdt, nowayout);
+	watchdog_set_drvdata(da9055_wdt, driver_data);
+
+	kref_init(&driver_data->kref);
+
+	ret = da9055_wdt_stop(da9055_wdt);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
+		goto err;
+	}
+
+	dev_set_drvdata(&pdev->dev, driver_data);
+
+	ret = watchdog_register_device(&driver_data->wdt);
+	if (ret != 0)
+		dev_err(da9055->dev, "watchdog_register_device() failed: %d\n",
+			ret);
+
+err:
+	return ret;
+}
+
+static int da9055_wdt_remove(struct platform_device *pdev)
+{
+	struct da9055_wdt_data *driver_data = dev_get_drvdata(&pdev->dev);
+
+	watchdog_unregister_device(&driver_data->wdt);
+	kref_put(&driver_data->kref, da9055_wdt_release_resources);
+
+	return 0;
+}
+
+static struct platform_driver da9055_wdt_driver = {
+	.probe = da9055_wdt_probe,
+	.remove = da9055_wdt_remove,
+	.driver = {
+		.name	= "da9055-watchdog",
+	},
+};
+
+module_platform_driver(da9055_wdt_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("DA9055 watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-watchdog");
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 8791879e518..e8e87246ea6 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -208,7 +208,7 @@ static int davinci_wdt_probe(struct platform_device *pdev)
 	if (WARN_ON(IS_ERR(wdt_clk)))
 		return PTR_ERR(wdt_clk);
 
-	clk_enable(wdt_clk);
+	clk_prepare_enable(wdt_clk);
 
 	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
 		heartbeat = DEFAULT_HEARTBEAT;
@@ -256,16 +256,23 @@ static int davinci_wdt_remove(struct platform_device *pdev)
 		wdt_mem = NULL;
 	}
 
-	clk_disable(wdt_clk);
+	clk_disable_unprepare(wdt_clk);
 	clk_put(wdt_clk);
 
 	return 0;
 }
 
+static const struct of_device_id davinci_wdt_of_match[] = {
+	{ .compatible = "ti,davinci-wdt", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, davinci_wdt_of_match);
+
 static struct platform_driver platform_wdt_driver = {
 	.driver = {
 		.name = "watchdog",
 		.owner	= THIS_MODULE,
+		.of_match_table = davinci_wdt_of_match,
 	},
 	.probe = davinci_wdt_probe,
 	.remove = davinci_wdt_remove,
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 8717255ec7b..11796b9b864 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -39,7 +39,7 @@
 #endif /* CONFIG_HPWDT_NMI_DECODING */
 #include <asm/nmi.h>
 
-#define HPWDT_VERSION			"1.3.0"
+#define HPWDT_VERSION			"1.3.1"
 #define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
 #define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
 #define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c
index a84eb551ea2..233cfadcb21 100644
--- a/drivers/watchdog/mpcore_wdt.c
+++ b/drivers/watchdog/mpcore_wdt.c
@@ -80,8 +80,7 @@ static irqreturn_t mpcore_wdt_fire(int irq, void *arg)
 
 	/* Check it really was our interrupt */
 	if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
-		dev_printk(KERN_CRIT, wdt->dev,
-					"Triggered - Reboot ignored.\n");
+		dev_crit(wdt->dev, "Triggered - Reboot ignored\n");
 		/* Clear the interrupt on the watchdog */
 		writel(1, wdt->base + TWD_WDOG_INTSTAT);
 		return IRQ_HANDLED;
@@ -123,7 +122,7 @@ static void mpcore_wdt_stop(struct mpcore_wdt *wdt)
 
 static void mpcore_wdt_start(struct mpcore_wdt *wdt)
 {
-	dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
+	dev_info(wdt->dev, "enabling watchdog\n");
 
 	/* This loads the count register but does NOT start the count yet */
 	mpcore_wdt_keepalive(wdt);
@@ -180,8 +179,8 @@ static int mpcore_wdt_release(struct inode *inode, struct file *file)
 	if (wdt->expect_close == 42)
 		mpcore_wdt_stop(wdt);
 	else {
-		dev_printk(KERN_CRIT, wdt->dev,
-				"unexpected close, not stopping watchdog!\n");
+		dev_crit(wdt->dev,
+			 "unexpected close, not stopping watchdog!\n");
 		mpcore_wdt_keepalive(wdt);
 	}
 	clear_bit(0, &wdt->timer_alive);
@@ -351,9 +350,9 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
 		ret = devm_request_irq(wdt->dev, wdt->irq, mpcore_wdt_fire, 0,
 				"mpcore_wdt", wdt);
 		if (ret) {
-			dev_printk(KERN_ERR, wdt->dev,
-					"cannot register IRQ%d for watchdog\n",
-					wdt->irq);
+			dev_err(wdt->dev,
+				"cannot register IRQ%d for watchdog\n",
+				wdt->irq);
 			return ret;
 		}
 	}
@@ -365,9 +364,9 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
 	mpcore_wdt_miscdev.parent = &pdev->dev;
 	ret = misc_register(&mpcore_wdt_miscdev);
 	if (ret) {
-		dev_printk(KERN_ERR, wdt->dev,
+		dev_err(wdt->dev,
 			"cannot register miscdev on minor=%d (err=%d)\n",
-							WATCHDOG_MINOR, ret);
+			WATCHDOG_MINOR, ret);
 		return ret;
 	}
 
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 3e3ebbc83fa..34ed61ea02b 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -31,42 +31,34 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/fs.h>
 #include <linux/mm.h>
-#include <linux/miscdevice.h>
 #include <linux/watchdog.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/moduleparam.h>
-#include <linux/bitops.h>
 #include <linux/io.h>
-#include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/omap-wd-timer.h>
 
 #include "omap_wdt.h"
 
-static struct platform_device *omap_wdt_dev;
-
 static unsigned timer_margin;
 module_param(timer_margin, uint, 0);
 MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
 
-static unsigned int wdt_trgr_pattern = 0x1234;
-static DEFINE_SPINLOCK(wdt_lock);
-
 struct omap_wdt_dev {
 	void __iomem    *base;          /* physical */
 	struct device   *dev;
-	int             omap_wdt_users;
+	bool		omap_wdt_users;
 	struct resource *mem;
-	struct miscdevice omap_wdt_miscdev;
+	int		wdt_trgr_pattern;
+	struct mutex	lock;		/* to avoid races with PM */
 };
 
-static void omap_wdt_ping(struct omap_wdt_dev *wdev)
+static void omap_wdt_reload(struct omap_wdt_dev *wdev)
 {
 	void __iomem    *base = wdev->base;
 
@@ -74,8 +66,8 @@ static void omap_wdt_ping(struct omap_wdt_dev *wdev)
 	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
 		cpu_relax();
 
-	wdt_trgr_pattern = ~wdt_trgr_pattern;
-	__raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
+	wdev->wdt_trgr_pattern = ~wdev->wdt_trgr_pattern;
+	__raw_writel(wdev->wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
 
 	/* wait for posted write to complete */
 	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
@@ -111,18 +103,10 @@ static void omap_wdt_disable(struct omap_wdt_dev *wdev)
 		cpu_relax();
 }
 
-static void omap_wdt_adjust_timeout(unsigned new_timeout)
-{
-	if (new_timeout < TIMER_MARGIN_MIN)
-		new_timeout = TIMER_MARGIN_DEFAULT;
-	if (new_timeout > TIMER_MARGIN_MAX)
-		new_timeout = TIMER_MARGIN_MAX;
-	timer_margin = new_timeout;
-}
-
-static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
+static void omap_wdt_set_timer(struct omap_wdt_dev *wdev,
+				   unsigned int timeout)
 {
-	u32 pre_margin = GET_WLDR_VAL(timer_margin);
+	u32 pre_margin = GET_WLDR_VAL(timeout);
 	void __iomem *base = wdev->base;
 
 	/* just count up at 32 KHz */
@@ -134,16 +118,14 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
 		cpu_relax();
 }
 
-/*
- *	Allow only one task to hold it open
- */
-static int omap_wdt_open(struct inode *inode, struct file *file)
+static int omap_wdt_start(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 	void __iomem *base = wdev->base;
 
-	if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
-		return -EBUSY;
+	mutex_lock(&wdev->lock);
+
+	wdev->omap_wdt_users = true;
 
 	pm_runtime_get_sync(wdev->dev);
 
@@ -155,223 +137,169 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
 	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
 		cpu_relax();
 
-	file->private_data = (void *) wdev;
-
-	omap_wdt_set_timeout(wdev);
-	omap_wdt_ping(wdev); /* trigger loading of new timeout value */
+	omap_wdt_set_timer(wdev, wdog->timeout);
+	omap_wdt_reload(wdev); /* trigger loading of new timeout value */
 	omap_wdt_enable(wdev);
 
-	return nonseekable_open(inode, file);
+	mutex_unlock(&wdev->lock);
+
+	return 0;
 }
 
-static int omap_wdt_release(struct inode *inode, struct file *file)
+static int omap_wdt_stop(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = file->private_data;
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-	/*
-	 *      Shut off the timer unless NOWAYOUT is defined.
-	 */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	mutex_lock(&wdev->lock);
 	omap_wdt_disable(wdev);
-
 	pm_runtime_put_sync(wdev->dev);
-#else
-	pr_crit("Unexpected close, not stopping!\n");
-#endif
-	wdev->omap_wdt_users = 0;
-
+	wdev->omap_wdt_users = false;
+	mutex_unlock(&wdev->lock);
 	return 0;
 }
 
-static ssize_t omap_wdt_write(struct file *file, const char __user *data,
-		size_t len, loff_t *ppos)
+static int omap_wdt_ping(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = file->private_data;
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-	/* Refresh LOAD_TIME. */
-	if (len) {
-		spin_lock(&wdt_lock);
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-	}
-	return len;
+	mutex_lock(&wdev->lock);
+	omap_wdt_reload(wdev);
+	mutex_unlock(&wdev->lock);
+
+	return 0;
 }
 
-static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
-						unsigned long arg)
+static int omap_wdt_set_timeout(struct watchdog_device *wdog,
+				unsigned int timeout)
 {
-	struct omap_wd_timer_platform_data *pdata;
-	struct omap_wdt_dev *wdev;
-	u32 rs;
-	int new_margin, bs;
-	static const struct watchdog_info ident = {
-		.identity = "OMAP Watchdog",
-		.options = WDIOF_SETTIMEOUT,
-		.firmware_version = 0,
-	};
-
-	wdev = file->private_data;
-	pdata = wdev->dev->platform_data;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user((struct watchdog_info __user *)arg, &ident,
-				sizeof(ident));
-	case WDIOC_GETSTATUS:
-		return put_user(0, (int __user *)arg);
-	case WDIOC_GETBOOTSTATUS:
-		if (!pdata || !pdata->read_reset_sources)
-			return put_user(0, (int __user *)arg);
-		rs = pdata->read_reset_sources();
-		bs = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
-			WDIOF_CARDRESET : 0;
-		return put_user(bs, (int __user *)arg);
-	case WDIOC_KEEPALIVE:
-		spin_lock(&wdt_lock);
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-		return 0;
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_margin, (int __user *)arg))
-			return -EFAULT;
-		omap_wdt_adjust_timeout(new_margin);
-
-		spin_lock(&wdt_lock);
-		omap_wdt_disable(wdev);
-		omap_wdt_set_timeout(wdev);
-		omap_wdt_enable(wdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-		/* Fall */
-	case WDIOC_GETTIMEOUT:
-		return put_user(timer_margin, (int __user *)arg);
-	default:
-		return -ENOTTY;
-	}
+	mutex_lock(&wdev->lock);
+	omap_wdt_disable(wdev);
+	omap_wdt_set_timer(wdev, timeout);
+	omap_wdt_enable(wdev);
+	omap_wdt_reload(wdev);
+	wdog->timeout = timeout;
+	mutex_unlock(&wdev->lock);
+
+	return 0;
 }
 
-static const struct file_operations omap_wdt_fops = {
-	.owner = THIS_MODULE,
-	.write = omap_wdt_write,
-	.unlocked_ioctl = omap_wdt_ioctl,
-	.open = omap_wdt_open,
-	.release = omap_wdt_release,
-	.llseek = no_llseek,
+static const struct watchdog_info omap_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity = "OMAP Watchdog",
+};
+
+static const struct watchdog_ops omap_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= omap_wdt_start,
+	.stop		= omap_wdt_stop,
+	.ping		= omap_wdt_ping,
+	.set_timeout	= omap_wdt_set_timeout,
 };
 
 static int omap_wdt_probe(struct platform_device *pdev)
 {
+	struct omap_wd_timer_platform_data *pdata = pdev->dev.platform_data;
+	bool nowayout = WATCHDOG_NOWAYOUT;
+	struct watchdog_device *omap_wdt;
 	struct resource *res, *mem;
 	struct omap_wdt_dev *wdev;
+	u32 rs;
 	int ret;
 
+	omap_wdt = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
+	if (!omap_wdt)
+		return -ENOMEM;
+
 	/* reserve static register mappings */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		ret = -ENOENT;
-		goto err_get_resource;
-	}
+	if (!res)
+		return -ENOENT;
 
-	if (omap_wdt_dev) {
-		ret = -EBUSY;
-		goto err_busy;
-	}
+	mem = devm_request_mem_region(&pdev->dev, res->start,
+				      resource_size(res), pdev->name);
+	if (!mem)
+		return -EBUSY;
 
-	mem = request_mem_region(res->start, resource_size(res), pdev->name);
-	if (!mem) {
-		ret = -EBUSY;
-		goto err_busy;
-	}
+	wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
+	if (!wdev)
+		return -ENOMEM;
 
-	wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
-	if (!wdev) {
-		ret = -ENOMEM;
-		goto err_kzalloc;
-	}
+	wdev->omap_wdt_users	= false;
+	wdev->mem		= mem;
+	wdev->dev		= &pdev->dev;
+	wdev->wdt_trgr_pattern	= 0x1234;
+	mutex_init(&wdev->lock);
 
-	wdev->omap_wdt_users = 0;
-	wdev->mem = mem;
-	wdev->dev = &pdev->dev;
+	wdev->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!wdev->base)
+		return -ENOMEM;
 
-	wdev->base = ioremap(res->start, resource_size(res));
-	if (!wdev->base) {
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
+	omap_wdt->info	      = &omap_wdt_info;
+	omap_wdt->ops	      = &omap_wdt_ops;
+	omap_wdt->min_timeout = TIMER_MARGIN_MIN;
+	omap_wdt->max_timeout = TIMER_MARGIN_MAX;
+
+	if (timer_margin >= TIMER_MARGIN_MIN &&
+	    timer_margin <= TIMER_MARGIN_MAX)
+		omap_wdt->timeout = timer_margin;
+	else
+		omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
 
-	platform_set_drvdata(pdev, wdev);
+	watchdog_set_drvdata(omap_wdt, wdev);
+	watchdog_set_nowayout(omap_wdt, nowayout);
+
+	platform_set_drvdata(pdev, omap_wdt);
 
 	pm_runtime_enable(wdev->dev);
 	pm_runtime_get_sync(wdev->dev);
 
-	omap_wdt_disable(wdev);
-	omap_wdt_adjust_timeout(timer_margin);
+	if (pdata && pdata->read_reset_sources)
+		rs = pdata->read_reset_sources();
+	else
+		rs = 0;
+	omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
+				WDIOF_CARDRESET : 0;
 
-	wdev->omap_wdt_miscdev.parent = &pdev->dev;
-	wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
-	wdev->omap_wdt_miscdev.name = "watchdog";
-	wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
+	omap_wdt_disable(wdev);
 
-	ret = misc_register(&(wdev->omap_wdt_miscdev));
-	if (ret)
-		goto err_misc;
+	ret = watchdog_register_device(omap_wdt);
+	if (ret) {
+		pm_runtime_disable(wdev->dev);
+		return ret;
+	}
 
 	pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
 		__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
-		timer_margin);
+		omap_wdt->timeout);
 
 	pm_runtime_put_sync(wdev->dev);
 
-	omap_wdt_dev = pdev;
-
 	return 0;
-
-err_misc:
-	pm_runtime_disable(wdev->dev);
-	platform_set_drvdata(pdev, NULL);
-	iounmap(wdev->base);
-
-err_ioremap:
-	wdev->base = NULL;
-	kfree(wdev);
-
-err_kzalloc:
-	release_mem_region(res->start, resource_size(res));
-
-err_busy:
-err_get_resource:
-
-	return ret;
 }
 
 static void omap_wdt_shutdown(struct platform_device *pdev)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
+	mutex_lock(&wdev->lock);
 	if (wdev->omap_wdt_users) {
 		omap_wdt_disable(wdev);
 		pm_runtime_put_sync(wdev->dev);
 	}
+	mutex_unlock(&wdev->lock);
 }
 
 static int omap_wdt_remove(struct platform_device *pdev)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	pm_runtime_disable(wdev->dev);
-	if (!res)
-		return -ENOENT;
-
-	misc_deregister(&(wdev->omap_wdt_miscdev));
-	release_mem_region(res->start, resource_size(res));
-	platform_set_drvdata(pdev, NULL);
-
-	iounmap(wdev->base);
-
-	kfree(wdev);
-	omap_wdt_dev = NULL;
+	watchdog_unregister_device(wdog);
 
 	return 0;
 }
@@ -386,25 +314,31 @@ static int omap_wdt_remove(struct platform_device *pdev)
 
 static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
+	mutex_lock(&wdev->lock);
 	if (wdev->omap_wdt_users) {
 		omap_wdt_disable(wdev);
 		p