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

Pull watchdog updates from Wim Van Sebroeck:

 - new drivers for: NI 903x/913x watchdog driver, WinSystems EBC-C384
   watchdog timer and ARM SBSA watchdog driver

 - Support for NCT6102D devices

 - Improvements of the generic watchdog framework (improve restart
   handler, make set_timeout optional, introduce infrastructure
   triggered keepalives, ...

 - improvements on the pnx4008 watchdog driver

 - several smaller fixes and improvements

* git://www.linux-watchdog.org/linux-watchdog: (28 commits)
  watchdog: Ensure that wdd is not dereferenced if NULL
  watchdog: imx2: Convert to use infrastructure triggered keepalives
  watchdog: dw_wdt: Convert to use watchdog infrastructure
  watchdog: Add support for minimum time between heartbeats
  watchdog: Make stop function optional
  watchdog: Introduce WDOG_HW_RUNNING flag
  watchdog: Introduce hardware maximum heartbeat in watchdog core
  watchdog: Make set_timeout function optional
  arm: lpc32xx: remove restart handler
  arm: lpc32xx: phy3250 remove restart hook
  watchdog: pnx4008: restart: support "cmd" from userspace
  watchdog: pnx4008: add support for soft reset
  watchdog: pnx4008: add restart handler
  watchdog: pnx4008: update logging during power-on
  watchdog: tangox_wdt: test clock rate to avoid division by 0
  watchdog: atlas7_wdt: test clock rate to avoid division by 0
  watchdog: s3c2410_wdt: Add max and min timeout values
  Watchdog: introduce ARM SBSA watchdog driver
  Documentation: add sbsa-gwdt driver documentation
  watchdog: Add watchdog timer support for the WinSystems EBC-C384
  ...

26 files changed, 1352 insertions, 316 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 9289da313d98..fb947655badd 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -202,6 +202,26 @@ config ARM_SP805_WATCHDOG
 	  ARM Primecell SP805 Watchdog timer. This will reboot your system when
 	  the timeout is reached.
 
+config ARM_SBSA_WATCHDOG
+	tristate "ARM SBSA Generic Watchdog"
+	depends on ARM64
+	depends on ARM_ARCH_TIMER
+	select WATCHDOG_CORE
+	help
+	  ARM SBSA Generic Watchdog has two stage timeouts:
+	  the first signal (WS0) is for alerting the system by interrupt,
+	  the second one (WS1) is a real hardware reset.
+	  More details: ARM DEN0029B - Server Base System Architecture (SBSA)
+
+	  This driver can operate ARM SBSA Generic Watchdog as a single stage
+	  or a two stages watchdog, it depends on the module parameter "action".
+
+	  Note: the maximum timeout in the two stages mode is half of that in
+	  the single stage mode.
+
+	  To compile this driver as module, choose M here: The module
+	  will be called sbsa_gwdt.
+
 config ASM9260_WATCHDOG
 	tristate "Alphascale ASM9260 watchdog"
 	depends on MACH_ASM9260
@@ -330,6 +350,7 @@ config SA1100_WATCHDOG
 config DW_WATCHDOG
 	tristate "Synopsys DesignWare watchdog"
 	depends on HAS_IOMEM
+	select WATCHDOG_CORE
 	help
 	  Say Y here if to include support for the Synopsys DesignWare
 	  watchdog timer found in many chips.
@@ -399,6 +420,7 @@ config DAVINCI_WATCHDOG
 config ORION_WATCHDOG
 	tristate "Orion watchdog"
 	depends on ARCH_ORION5X || ARCH_DOVE || MACH_DOVE || ARCH_MVEBU
+	depends on ARM
 	select WATCHDOG_CORE
 	help
 	  Say Y here if to include support for the watchdog timer
@@ -468,6 +490,7 @@ config NUC900_WATCHDOG
 config TS4800_WATCHDOG
 	tristate "TS-4800 Watchdog"
 	depends on HAS_IOMEM && OF
+	depends on SOC_IMX51 || COMPILE_TEST
 	select WATCHDOG_CORE
 	select MFD_SYSCON
 	help
@@ -713,6 +736,15 @@ config ALIM7101_WDT
 
 	  Most people will say N.
 
+config EBC_C384_WDT
+	tristate "WinSystems EBC-C384 Watchdog Timer"
+	depends on X86
+	select WATCHDOG_CORE
+	help
+	  Enables watchdog timer support for the watchdog timer on the
+	  WinSystems EBC-C384 motherboard. The timeout may be configured via
+	  the timeout module parameter.
+
 config F71808E_WDT
 	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
 	depends on X86
@@ -1142,6 +1174,7 @@ config W83627HF_WDT
 		NCT6779
 		NCT6791
 		NCT6792
+		NCT6102D/04D/06D
 
 	  This watchdog simply watches your kernel to make sure it doesn't
 	  freeze, and if it does, it reboots your computer after a certain
@@ -1229,6 +1262,17 @@ config INTEL_MEI_WDT
 	  To compile this driver as a module, choose M here:
 	  the module will be called mei_wdt.
 
+config NI903X_WDT
+	tristate "NI 903x/913x Watchdog"
+	depends on X86 && ACPI
+	select WATCHDOG_CORE
+	---help---
+	  This is the driver for the watchdog timer on the National Instruments
+	  903x/913x real-time controllers.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ni903x_wdt.
+
 # M32R Architecture
 
 # M68K Architecture
@@ -1392,10 +1436,12 @@ config BCM7038_WDT
 	tristate "BCM7038 Watchdog"
 	select WATCHDOG_CORE
 	depends on HAS_IOMEM
+	depends on ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST
 	help
-	 Watchdog driver for the built-in hardware in Broadcom 7038 SoCs.
-
-	 Say 'Y or 'M' here to enable the driver.
+	 Watchdog driver for the built-in hardware in Broadcom 7038 and
+	 later SoCs used in set-top boxes.  BCM7038 was made public
+	 during the 2004 CES, and since then, many Broadcom chips use this
+	 watchdog block, including some cable modem chips.
 
 config IMGPDC_WDT
 	tristate "Imagination Technologies PDC Watchdog Timer"
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 14bd772d3e66..feb6270fdbde 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
 
 # ARM Architecture
 obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o
+obj-$(CONFIG_ARM_SBSA_WATCHDOG) += sbsa_gwdt.o
 obj-$(CONFIG_ASM9260_WATCHDOG) += asm9260_wdt.o
 obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
 obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
@@ -88,6 +89,7 @@ obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
 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-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
 obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o
 obj-$(CONFIG_GEODE_WDT) += geodewdt.o
@@ -127,6 +129,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
 obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
 obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o
 obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o
+obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
 
 # M32R Architecture
 
diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
index df6d9242a319..ed80734befae 100644
--- a/drivers/watchdog/atlas7_wdt.c
+++ b/drivers/watchdog/atlas7_wdt.c
@@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
 	writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
 
 	wdt->tick_rate = clk_get_rate(clk);
+	if (!wdt->tick_rate) {
+		ret = -EINVAL;
+		goto err1;
+	}
+
 	wdt->clk = clk;
 	atlas7_wdd.min_timeout = 1;
 	atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
index df1c2a4b0165..a1900b9ab6c4 100644
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -87,7 +87,8 @@ static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
 	return 0;
 }
 
-static int bcm47xx_wdt_restart(struct watchdog_device *wdd)
+static int bcm47xx_wdt_restart(struct watchdog_device *wdd,
+			       unsigned long action, void *data)
 {
 	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
 
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 11e887572649..a100f648880d 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -119,7 +119,8 @@ static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
 	return ret;
 }
 
-static int da9063_wdt_restart(struct watchdog_device *wdd)
+static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
+			      void *data)
 {
 	struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
 	int ret;
diff --git a/drivers/watchdog/digicolor_wdt.c b/drivers/watchdog/digicolor_wdt.c
index 1ccb0b239348..77df772406b0 100644
--- a/drivers/watchdog/digicolor_wdt.c
+++ b/drivers/watchdog/digicolor_wdt.c
@@ -48,7 +48,8 @@ static void dc_wdt_set(struct dc_wdt *wdt, u32 ticks)
 	spin_unlock_irqrestore(&wdt->lock, flags);
 }
 
-static int dc_wdt_restart(struct watchdog_device *wdog)
+static int dc_wdt_restart(struct watchdog_device *wdog, unsigned long action,
+			  void *data)
 {
 	struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
 
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 8fefa4ad46d4..2acb51cf5504 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -12,9 +12,8 @@
  * and these are a function of the input clock frequency.
  *
  * The DesignWare watchdog cannot be stopped once it has been started so we
- * use a software timer to implement a ping that will keep the watchdog alive.
- * If we receive an expected close for the watchdog then we keep the timer
- * running, otherwise the timer is stopped and the watchdog will expire.
+ * do not implement a stop function. The watchdog core will continue to send
+ * heartbeat requests after the watchdog device has been closed.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -22,12 +21,9 @@
 #include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/device.h>
 #include <linux/err.h>
-#include <linux/fs.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
-#include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/notifier.h>
@@ -35,8 +31,6 @@
 #include <linux/pm.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
-#include <linux/timer.h>
-#include <linux/uaccess.h>
 #include <linux/watchdog.h>
 
 #define WDOG_CONTROL_REG_OFFSET		    0x00
@@ -57,53 +51,50 @@ module_param(nowayout, bool, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
 		 "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
-#define WDT_TIMEOUT		(HZ / 2)
-
-static struct {
+struct dw_wdt {
 	void __iomem		*regs;
 	struct clk		*clk;
-	unsigned long		in_use;
-	unsigned long		next_heartbeat;
-	struct timer_list	timer;
-	int			expect_close;
 	struct notifier_block	restart_handler;
-} dw_wdt;
+	struct watchdog_device	wdd;
+};
+
+#define to_dw_wdt(wdd)	container_of(wdd, struct dw_wdt, wdd)
 
-static inline int dw_wdt_is_enabled(void)
+static inline int dw_wdt_is_enabled(struct dw_wdt *dw_wdt)
 {
-	return readl(dw_wdt.regs + WDOG_CONTROL_REG_OFFSET) &
+	return readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET) &
 		WDOG_CONTROL_REG_WDT_EN_MASK;
 }
 
-static inline int dw_wdt_top_in_seconds(unsigned top)
+static inline int dw_wdt_top_in_seconds(struct dw_wdt *dw_wdt, unsigned top)
 {
 	/*
 	 * There are 16 possible timeout values in 0..15 where the number of
 	 * cycles is 2 ^ (16 + i) and the watchdog counts down.
 	 */
-	return (1U << (16 + top)) / clk_get_rate(dw_wdt.clk);
+	return (1U << (16 + top)) / clk_get_rate(dw_wdt->clk);
 }
 
-static int dw_wdt_get_top(void)
+static int dw_wdt_get_top(struct dw_wdt *dw_wdt)
 {
-	int top = readl(dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET) & 0xF;
+	int top = readl(dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET) & 0xF;
 
-	return dw_wdt_top_in_seconds(top);
+	return dw_wdt_top_in_seconds(dw_wdt, top);
 }
 
-static inline void dw_wdt_set_next_heartbeat(void)
+static int dw_wdt_ping(struct watchdog_device *wdd)
 {
-	dw_wdt.next_heartbeat = jiffies + dw_wdt_get_top() * HZ;
-}
+	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);
 
-static void dw_wdt_keepalive(void)
-{
-	writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs +
+	writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt->regs +
 	       WDOG_COUNTER_RESTART_REG_OFFSET);
+
+	return 0;
 }
 
-static int dw_wdt_set_top(unsigned top_s)
+static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
 {
+	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);
 	int i, top_val = DW_WDT_MAX_TOP;
 
 	/*
@@ -111,7 +102,7 @@ static int dw_wdt_set_top(unsigned top_s)
 	 * always look for >=.
 	 */
 	for (i = 0; i <= DW_WDT_MAX_TOP; ++i)
-		if (dw_wdt_top_in_seconds(i) >= top_s) {
+		if (dw_wdt_top_in_seconds(dw_wdt, i) >= top_s) {
 			top_val = i;
 			break;
 		}
@@ -123,33 +114,43 @@ static int dw_wdt_set_top(unsigned top_s)
 	 * effectively get a pat of the watchdog right here.
 	 */
 	writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
-		dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
+	       dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
 
-	/*
-	 * Add an explicit pat to handle versions of the watchdog that
-	 * don't have TOPINIT.  This won't hurt on versions that have
-	 * it.
-	 */
-	dw_wdt_keepalive();
+	wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
 
-	dw_wdt_set_next_heartbeat();
+	return 0;
+}
+
+static int dw_wdt_start(struct watchdog_device *wdd)
+{
+	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);
+
+	dw_wdt_set_timeout(wdd, wdd->timeout);
 
-	return dw_wdt_top_in_seconds(top_val);
+	set_bit(WDOG_HW_RUNNING, &wdd->status);
+
+	writel(WDOG_CONTROL_REG_WDT_EN_MASK,
+	       dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
+
+	return 0;
 }
 
 static int dw_wdt_restart_handle(struct notifier_block *this,
-				unsigned long mode, void *cmd)
+				 unsigned long mode, void *cmd)
 {
+	struct dw_wdt *dw_wdt;
 	u32 val;
 
-	writel(0, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
-	val = readl(dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
+	dw_wdt = container_of(this, struct dw_wdt, restart_handler);
+
+	writel(0, dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
+	val = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
 	if (val & WDOG_CONTROL_REG_WDT_EN_MASK)
-		writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs +
-			WDOG_COUNTER_RESTART_REG_OFFSET);
+		writel(WDOG_COUNTER_RESTART_KICK_VALUE,
+		       dw_wdt->regs + WDOG_COUNTER_RESTART_REG_OFFSET);
 	else
 		writel(WDOG_CONTROL_REG_WDT_EN_MASK,
-		       dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
+		       dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
 
 	/* wait for reset to assert... */
 	mdelay(500);
@@ -157,74 +158,12 @@ static int dw_wdt_restart_handle(struct notifier_block *this,
 	return NOTIFY_DONE;
 }
 
-static void dw_wdt_ping(unsigned long data)
+static unsigned int dw_wdt_get_timeleft(struct watchdog_device *wdd)
 {
-	if (time_before(jiffies, dw_wdt.next_heartbeat) ||
-	    (!nowayout && !dw_wdt.in_use)) {
-		dw_wdt_keepalive();
-		mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);
-	} else
-		pr_crit("keepalive missed, machine will reset\n");
-}
-
-static int dw_wdt_open(struct inode *inode, struct file *filp)
-{
-	if (test_and_set_bit(0, &dw_wdt.in_use))
-		return -EBUSY;
-
-	/* Make sure we don't get unloaded. */
-	__module_get(THIS_MODULE);
-
-	if (!dw_wdt_is_enabled()) {
-		/*
-		 * The watchdog is not currently enabled. Set the timeout to
-		 * something reasonable and then start it.
-		 */
-		dw_wdt_set_top(DW_WDT_DEFAULT_SECONDS);
-		writel(WDOG_CONTROL_REG_WDT_EN_MASK,
-		       dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
-	}
-
-	dw_wdt_set_next_heartbeat();
-
-	return nonseekable_open(inode, filp);
-}
-
-static ssize_t dw_wdt_write(struct file *filp, const char __user *buf,
-			    size_t len, loff_t *offset)
-{
-	if (!len)
-		return 0;
-
-	if (!nowayout) {
-		size_t i;
-
-		dw_wdt.expect_close = 0;
-
-		for (i = 0; i < len; ++i) {
-			char c;
-
-			if (get_user(c, buf + i))
-				return -EFAULT;
-
-			if (c == 'V') {
-				dw_wdt.expect_close = 1;
-				break;
-			}
-		}
-	}
+	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);
 
-	dw_wdt_set_next_heartbeat();
-	dw_wdt_keepalive();
-	mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);
-
-	return len;
-}
-
-static u32 dw_wdt_time_left(void)
-{
-	return readl(dw_wdt.regs + WDOG_CURRENT_COUNT_REG_OFFSET) /
-		clk_get_rate(dw_wdt.clk);
+	return readl(dw_wdt->regs + WDOG_CURRENT_COUNT_REG_OFFSET) /
+		clk_get_rate(dw_wdt->clk);
 }
 
 static const struct watchdog_info dw_wdt_ident = {
@@ -233,78 +172,33 @@ static const struct watchdog_info dw_wdt_ident = {
 	.identity	= "Synopsys DesignWare Watchdog",
 };
 
-static long dw_wdt_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-	unsigned long val;
-	int timeout;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user((void __user *)arg, &dw_wdt_ident,
-				    sizeof(dw_wdt_ident)) ? -EFAULT : 0;
-
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, (int __user *)arg);
-
-	case WDIOC_KEEPALIVE:
-		dw_wdt_set_next_heartbeat();
-		return 0;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(val, (int __user *)arg))
-			return -EFAULT;
-		timeout = dw_wdt_set_top(val);
-		return put_user(timeout , (int __user *)arg);
-
-	case WDIOC_GETTIMEOUT:
-		return put_user(dw_wdt_get_top(), (int __user *)arg);
-
-	case WDIOC_GETTIMELEFT:
-		/* Get the time left until expiry. */
-		if (get_user(val, (int __user *)arg))
-			return -EFAULT;
-		return put_user(dw_wdt_time_left(), (int __user *)arg);
-
-	default:
-		return -ENOTTY;
-	}
-}
-
-static int dw_wdt_release(struct inode *inode, struct file *filp)
-{
-	clear_bit(0, &dw_wdt.in_use);
-
-	if (!dw_wdt.expect_close) {
-		del_timer(&dw_wdt.timer);
-
-		if (!nowayout)
-			pr_crit("unexpected close, system will reboot soon\n");
-		else
-			pr_crit("watchdog cannot be disabled, system will reboot soon\n");
-	}
-
-	dw_wdt.expect_close = 0;
-
-	return 0;
-}
+static const struct watchdog_ops dw_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= dw_wdt_start,
+	.ping		= dw_wdt_ping,
+	.set_timeout	= dw_wdt_set_timeout,
+	.get_timeleft	= dw_wdt_get_timeleft,
+};
 
 #ifdef CONFIG_PM_SLEEP
 static int dw_wdt_suspend(struct device *dev)
 {
-	clk_disable_unprepare(dw_wdt.clk);
+	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(dw_wdt->clk);
 
 	return 0;
 }
 
 static int dw_wdt_resume(struct device *dev)
 {
-	int err = clk_prepare_enable(dw_wdt.clk);
+	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
+	int err = clk_prepare_enable(dw_wdt->clk);
 
 	if (err)
 		return err;
 
-	dw_wdt_keepalive();
+	dw_wdt_ping(&dw_wdt->wdd);
 
 	return 0;
 }
@@ -312,67 +206,82 @@ static int dw_wdt_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(dw_wdt_pm_ops, dw_wdt_suspend, dw_wdt_resume);
 
-static const struct file_operations wdt_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.open		= dw_wdt_open,
-	.write		= dw_wdt_write,
-	.unlocked_ioctl	= dw_wdt_ioctl,
-	.release	= dw_wdt_release
-};
-
-static struct miscdevice dw_wdt_miscdev = {
-	.fops		= &wdt_fops,
-	.name		= "watchdog",
-	.minor		= WATCHDOG_MINOR,
-};
-
 static int dw_wdt_drv_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
+	struct watchdog_device *wdd;
+	struct dw_wdt *dw_wdt;
+	struct resource *mem;
 	int ret;
-	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
-	dw_wdt.regs = devm_ioremap_resource(&pdev->dev, mem);
-	if (IS_ERR(dw_wdt.regs))
-		return PTR_ERR(dw_wdt.regs);
+	dw_wdt = devm_kzalloc(dev, sizeof(*dw_wdt), GFP_KERNEL);
+	if (!dw_wdt)
+		return -ENOMEM;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	dw_wdt->regs = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(dw_wdt->regs))
+		return PTR_ERR(dw_wdt->regs);
 
-	dw_wdt.clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dw_wdt.clk))
-		return PTR_ERR(dw_wdt.clk);
+	dw_wdt->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(dw_wdt->clk))
+		return PTR_ERR(dw_wdt->clk);
 
-	ret = clk_prepare_enable(dw_wdt.clk);
+	ret = clk_prepare_enable(dw_wdt->clk);
 	if (ret)
 		return ret;
 
-	ret = misc_register(&dw_wdt_miscdev);
+	wdd = &dw_wdt->wdd;
+	wdd->info = &dw_wdt_ident;
+	wdd->ops = &dw_wdt_ops;
+	wdd->min_timeout = 1;
+	wdd->max_hw_heartbeat_ms =
+		dw_wdt_top_in_seconds(dw_wdt, DW_WDT_MAX_TOP) * 1000;
+	wdd->parent = dev;
+
+	watchdog_set_drvdata(wdd, dw_wdt);
+	watchdog_set_nowayout(wdd, nowayout);
+	watchdog_init_timeout(wdd, 0, dev);
+
+	/*
+	 * If the watchdog is already running, use its already configured
+	 * timeout. Otherwise use the default or the value provided through
+	 * devicetree.
+	 */
+	if (dw_wdt_is_enabled(dw_wdt)) {
+		wdd->timeout = dw_wdt_get_top(dw_wdt);
+		set_bit(WDOG_HW_RUNNING, &wdd->status);
+	} else {
+		wdd->timeout = DW_WDT_DEFAULT_SECONDS;
+		watchdog_init_timeout(wdd, 0, dev);
+	}
+
+	platform_set_drvdata(pdev, dw_wdt);
+
+	ret = watchdog_register_device(wdd);
 	if (ret)
 		goto out_disable_clk;
 
-	dw_wdt.restart_handler.notifier_call = dw_wdt_restart_handle;
-	dw_wdt.restart_handler.priority = 128;
-	ret = register_restart_handler(&dw_wdt.restart_handler);
+	dw_wdt->restart_handler.notifier_call = dw_wdt_restart_handle;
+	dw_wdt->restart_handler.priority = 128;
+	ret = register_restart_handler(&dw_wdt->restart_handler);
 	if (ret)
 		pr_warn("cannot register restart handler\n");
 
-	dw_wdt_set_next_heartbeat();
-	setup_timer(&dw_wdt.timer, dw_wdt_ping, 0);
-	mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);
-
 	return 0;
 
 out_disable_clk:
-	clk_disable_unprepare(dw_wdt.clk);
-
+	clk_disable_unprepare(dw_wdt->clk);
 	return ret;
 }
 
 static int dw_wdt_drv_remove(struct platform_device *pdev)
 {
-	unregister_restart_handler(&dw_wdt.restart_handler);
-
-	misc_deregister(&dw_wdt_miscdev);
+	struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);
 
-	clk_disable_unprepare(dw_wdt.clk);
+	unregister_restart_handler(&dw_wdt->restart_handler);
+	watchdog_unregister_device(&dw_wdt->wdd);
+	clk_disable_unprepare(dw_wdt->clk);
 
 	return 0;
 }
diff --git a/drivers/watchdog/ebc-c384_wdt.c b/drivers/watchdog/ebc-c384_wdt.c
new file mode 100644
index 000000000000..77fda0b4b90e
--- /dev/null
+++ b/drivers/watchdog/ebc-c384_wdt.c
@@ -0,0 +1,188 @@
+/*
+ * Watchdog timer driver for the WinSystems EBC-C384
+ * Copyright (C) 2016 William Breathitt Gray
+ *
+ * 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.
+ */
+#include <linux/device.h>
+#include <linux/dmi.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define MODULE_NAME		"ebc-c384_wdt"
+#define WATCHDOG_TIMEOUT	60
+/*
+ * The timeout value in minutes must fit in a single byte when sent to the
+ * watchdog timer; the maximum timeout possible is 15300 (255 * 60) seconds.
+ */
+#define WATCHDOG_MAX_TIMEOUT	15300
+#define BASE_ADDR		0x564
+#define ADDR_EXTENT		5
+#define CFG_ADDR		(BASE_ADDR + 1)
+#define PET_ADDR		(BASE_ADDR + 2)
+
+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 unsigned timeout;
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
+	__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static int ebc_c384_wdt_start(struct watchdog_device *wdev)
+{
+	unsigned t = wdev->timeout;
+
+	/* resolution is in minutes for timeouts greater than 255 seconds */
+	if (t > 255)
+		t = DIV_ROUND_UP(t, 60);
+
+	outb(t, PET_ADDR);
+
+	return 0;
+}
+
+static int ebc_c384_wdt_stop(struct watchdog_device *wdev)
+{
+	outb(0x00, PET_ADDR);
+
+	return 0;
+}
+
+static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t)
+{
+	/* resolution is in minutes for timeouts greater than 255 seconds */
+	if (t > 255) {
+		/* round second resolution up to minute granularity */
+		wdev->timeout = roundup(t, 60);
+
+		/* set watchdog timer for minutes */
+		outb(0x00, CFG_ADDR);
+	} else {
+		wdev->timeout = t;
+
+		/* set watchdog timer for seconds */
+		outb(0x80, CFG_ADDR);
+	}
+
+	return 0;
+}
+
+static const struct watchdog_ops ebc_c384_wdt_ops = {
+	.start = ebc_c384_wdt_start,
+	.stop = ebc_c384_wdt_stop,
+	.set_timeout = ebc_c384_wdt_set_timeout
+};
+
+static const struct watchdog_info ebc_c384_wdt_info = {
+	.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT,
+	.identity = MODULE_NAME
+};
+
+static int __init ebc_c384_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct watchdog_device *wdd;
+
+	if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
+		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+			BASE_ADDR, BASE_ADDR + ADDR_EXTENT);
+		return -EBUSY;
+	}
+
+	wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
+	if (!wdd)
+		return -ENOMEM;
+
+	wdd->info = &ebc_c384_wdt_info;
+	wdd->ops = &ebc_c384_wdt_ops;
+	wdd->timeout = WATCHDOG_TIMEOUT;
+	wdd->min_timeout = 1;
+	wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
+
+	watchdog_set_nowayout(wdd, nowayout);
+
+	if (watchdog_init_timeout(wdd, timeout, dev))
+		dev_warn(dev, "Invalid timeout (%u seconds), using default (%u seconds)\n",
+			timeout, WATCHDOG_TIMEOUT);
+
+	platform_set_drvdata(pdev, wdd);
+
+	return watchdog_register_device(wdd);
+}
+
+static int ebc_c384_wdt_remove(struct platform_device *pdev)
+{
+	struct watchdog_device *wdd = platform_get_drvdata(pdev);
+
+	watchdog_unregister_device(wdd);
+
+	return 0;
+}
+
+static struct platform_driver ebc_c384_wdt_driver = {
+	.driver = {
+		.name = MODULE_NAME
+	},
+	.remove = ebc_c384_wdt_remove
+};
+
+static struct platform_device *ebc_c384_wdt_device;
+
+static int __init ebc_c384_wdt_init(void)
+{
+	int err;
+
+	if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
+		return -ENODEV;
+
+	ebc_c384_wdt_device = platform_device_alloc(MODULE_NAME, -1);
+	if (!ebc_c384_wdt_device)
+		return -ENOMEM;
+
+	err = platform_device_add(ebc_c384_wdt_device);
+	if (err)
+		goto err_platform_device;
+
+	err = platform_driver_probe(&ebc_c384_wdt_driver, ebc_c384_wdt_probe);
+	if (err)
+		goto err_platform_driver;
+
+	return 0;
+
+err_platform_driver:
+	platform_device_del(ebc_c384_wdt_device);
+err_platform_device:
+	platform_device_put(ebc_c384_wdt_device);
+	return err;
+}
+
+static void __exit ebc_c384_wdt_exit(void)
+{
+	platform_device_unregister(ebc_c384_wdt_device);
+	platform_driver_unregister(&ebc_c384_wdt_driver);
+}
+
+module_init(ebc_c384_wdt_init);
+module_exit(ebc_c384_wdt_exit);
+
+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
+MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" MODULE_NAME);
diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index 3679f2e1922f..516fbef00856 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -150,7 +150,8 @@ static int pdc_wdt_start(struct watchdog_device *wdt_dev)
 	return 0;
 }
 
-static int pdc_wdt_restart(struct watchdog_device *wdt_dev)
+static int pdc_wdt_restart(struct watchdog_device *wdt_dev,
+			   unsigned long action, void *data)
 {
 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);
 
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index e47966aa2db0..331aed831dac 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/