Merge branch 'for-5.5/core' into for-linus

- hid_have_special_driver[] cleanup for LED devices (Heiner Kallweit)
- HID parser improvements (Blaž Hrastnik, Candle Sun)

18 files changed, 672 insertions, 891 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index a45f9e3e442b..58e7c100b6ad 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -477,13 +477,6 @@ config IXP4XX_WATCHDOG
 
 	  Say N if you are unsure.
 
-config KS8695_WATCHDOG
-	tristate "KS8695 watchdog"
-	depends on ARCH_KS8695
-	help
-	  Watchdog timer embedded into KS8695 processor. This will reboot your
-	  system when the timeout is reached.
-
 config HAVE_S3C2410_WATCHDOG
 	bool
 	help
@@ -662,15 +655,6 @@ config STMP3XXX_RTC_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called stmp3xxx_rtc_wdt.
 
-config NUC900_WATCHDOG
-	tristate "Nuvoton NUC900 watchdog"
-	depends on ARCH_W90X900 || COMPILE_TEST
-	help
-	  Say Y here if to include support for the watchdog timer
-	  for the Nuvoton NUC900 series SoCs.
-	  To compile this driver as a module, choose M here: the
-	  module will be called nuc900_wdt.
-
 config TS4800_WATCHDOG
 	tristate "TS-4800 Watchdog"
 	depends on HAS_IOMEM && OF
@@ -740,6 +724,19 @@ config IMX_SC_WDT
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx_sc_wdt.
 
+config IMX7ULP_WDT
+	tristate "IMX7ULP Watchdog"
+	depends on ARCH_MXC || COMPILE_TEST
+	select WATCHDOG_CORE
+	help
+	  This is the driver for the hardware watchdog on the Freescale
+	  IMX7ULP and later processors. If you have one of these
+	  processors and wish to have watchdog support enabled,
+	  say Y, otherwise say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx7ulp_wdt.
+
 config UX500_WATCHDOG
 	tristate "ST-Ericsson Ux500 watchdog"
 	depends on MFD_DB8500_PRCMU
@@ -1046,8 +1043,8 @@ config F71808E_WDT
 	depends on X86
 	help
 	  This is the driver for the hardware watchdog on the Fintek F71808E,
-	  F71862FG, F71868, F71869, F71882FG, F71889FG, F81865 and F81866
-	  Super I/O controllers.
+	  F71862FG, F71868, F71869, F71882FG, F71889FG, F81803, F81865, and
+	  F81866 Super I/O controllers.
 
 	  You can compile this driver directly into the kernel, or use
 	  it as a module.  The module will be called f71808e_wdt.
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7caa920e7e60..2ee352bf3372 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -49,7 +49,6 @@ obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
 obj-$(CONFIG_977_WATCHDOG) += wdt977.o
 obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
 obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
-obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
 obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
 obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
 obj-$(CONFIG_SAMA5D4_WATCHDOG) += sama5d4_wdt.o
@@ -64,11 +63,11 @@ obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
 obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
 obj-$(CONFIG_NPCM7XX_WATCHDOG) += npcm_wdt.o
 obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
-obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
 obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
 obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
 obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
 obj-$(CONFIG_IMX_SC_WDT) += imx_sc_wdt.o
+obj-$(CONFIG_IMX7ULP_WDT) += imx7ulp_wdt.o
 obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
 obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
 obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index cc71861e033a..4ec0906bf12c 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -34,6 +34,7 @@ static const struct aspeed_wdt_config ast2500_config = {
 static const struct of_device_id aspeed_wdt_of_table[] = {
 	{ .compatible = "aspeed,ast2400-wdt", .data = &ast2400_config },
 	{ .compatible = "aspeed,ast2500-wdt", .data = &ast2500_config },
+	{ .compatible = "aspeed,ast2600-wdt", .data = &ast2500_config },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
@@ -53,6 +54,8 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
 #define   WDT_CTRL_ENABLE		BIT(0)
 #define WDT_TIMEOUT_STATUS	0x10
 #define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY	BIT(1)
+#define WDT_CLEAR_TIMEOUT_STATUS	0x14
+#define   WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION	BIT(0)
 
 /*
  * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
@@ -165,6 +168,60 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd,
 	return 0;
 }
 
+/* access_cs0 shows if cs0 is accessible, hence the reverted bit */
+static ssize_t access_cs0_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct aspeed_wdt *wdt = dev_get_drvdata(dev);
+	u32 status = readl(wdt->base + WDT_TIMEOUT_STATUS);
+
+	return sprintf(buf, "%u\n",
+		      !(status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY));
+}
+
+static ssize_t access_cs0_store(struct device *dev,
+				struct device_attribute *attr, const char *buf,
+				size_t size)
+{
+	struct aspeed_wdt *wdt = dev_get_drvdata(dev);
+	unsigned long val;
+
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
+
+	if (val)
+		writel(WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION,
+		       wdt->base + WDT_CLEAR_TIMEOUT_STATUS);
+
+	return size;
+}
+
+/*
+ * This attribute exists only if the system has booted from the alternate
+ * flash with 'alt-boot' option.
+ *
+ * At alternate flash the 'access_cs0' sysfs node provides:
+ *   ast2400: a way to get access to the primary SPI flash chip at CS0
+ *            after booting from the alternate chip at CS1.
+ *   ast2500: a way to restore the normal address mapping from
+ *            (CS0->CS1, CS1->CS0) to (CS0->CS0, CS1->CS1).
+ *
+ * Clearing the boot code selection and timeout counter also resets to the
+ * initial state the chip select line mapping. When the SoC is in normal
+ * mapping state (i.e. booted from CS0), clearing those bits does nothing for
+ * both versions of the SoC. For alternate boot mode (booted from CS1 due to
+ * wdt2 expiration) the behavior differs as described above.
+ *
+ * This option can be used with wdt2 (watchdog1) only.
+ */
+static DEVICE_ATTR_RW(access_cs0);
+
+static struct attribute *bswitch_attrs[] = {
+	&dev_attr_access_cs0.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(bswitch);
+
 static const struct watchdog_ops aspeed_wdt_ops = {
 	.start		= aspeed_wdt_start,
 	.stop		= aspeed_wdt_stop,
@@ -259,7 +316,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
 	}
 
-	if (of_device_is_compatible(np, "aspeed,ast2500-wdt")) {
+	if ((of_device_is_compatible(np, "aspeed,ast2500-wdt")) ||
+		(of_device_is_compatible(np, "aspeed,ast2600-wdt"))) {
 		u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
 
 		reg &= config->ext_pulse_width_mask;
@@ -306,9 +364,16 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 	}
 
 	status = readl(wdt->base + WDT_TIMEOUT_STATUS);
-	if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)
+	if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY) {
 		wdt->wdd.bootstatus = WDIOF_CARDRESET;
 
+		if (of_device_is_compatible(np, "aspeed,ast2400-wdt") ||
+		    of_device_is_compatible(np, "aspeed,ast2500-wdt"))
+			wdt->wdd.groups = bswitch_groups;
+	}
+
+	dev_set_drvdata(dev, wdt);
+
 	return devm_watchdog_register_device(dev, &wdt->wdd);
 }
 
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
index 2e09981fe978..75de664ef4b0 100644
--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -302,7 +302,7 @@ static int ath79_wdt_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static void ath97_wdt_shutdown(struct platform_device *pdev)
+static void ath79_wdt_shutdown(struct platform_device *pdev)
 {
 	ath79_wdt_disable();
 }
@@ -318,7 +318,7 @@ MODULE_DEVICE_TABLE(of, ath79_wdt_match);
 static struct platform_driver ath79_wdt_driver = {
 	.probe		= ath79_wdt_probe,
 	.remove		= ath79_wdt_remove,
-	.shutdown	= ath97_wdt_shutdown,
+	.shutdown	= ath79_wdt_shutdown,
 	.driver		= {
 		.name	= DRIVER_NAME,
 		.of_match_table = of_match_ptr(ath79_wdt_match),
diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index b973b31179df..9393be584e72 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -473,29 +473,6 @@ static long cpwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return 0;
 }
 
-static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
-			      unsigned long arg)
-{
-	int rval = -ENOIOCTLCMD;
-
-	switch (cmd) {
-	/* solaris ioctls are specific to this driver */
-	case WIOCSTART:
-	case WIOCSTOP:
-	case WIOCGSTAT:
-		mutex_lock(&cpwd_mutex);
-		rval = cpwd_ioctl(file, cmd, arg);
-		mutex_unlock(&cpwd_mutex);
-		break;
-
-	/* everything else is handled by the generic compat layer */
-	default:
-		break;
-	}
-
-	return rval;
-}
-
 static ssize_t cpwd_write(struct file *file, const char __user *buf,
 			  size_t count, loff_t *ppos)
 {
@@ -520,7 +497,7 @@ static ssize_t cpwd_read(struct file *file, char __user *buffer,
 static const struct file_operations cpwd_fops = {
 	.owner =		THIS_MODULE,
 	.unlocked_ioctl =	cpwd_ioctl,
-	.compat_ioctl =		cpwd_compat_ioctl,
+	.compat_ioctl =		compat_ptr_ioctl,
 	.open =			cpwd_open,
 	.write =		cpwd_write,
 	.read =			cpwd_read,
diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c
index 181440b7b4d0..aafc8d98bf9f 100644
--- a/drivers/watchdog/diag288_wdt.c
+++ b/drivers/watchdog/diag288_wdt.c
@@ -26,13 +26,11 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/slab.h>
-#include <linux/miscdevice.h>
 #include <linux/watchdog.h>
 #include <linux/suspend.h>
 #include <asm/ebcdic.h>
 #include <asm/diag.h>
 #include <linux/io.h>
-#include <linux/uaccess.h>
 
 #define MAX_CMDLEN 240
 #define DEFAULT_CMD "SYSTEM RESTART"
@@ -70,7 +68,6 @@ MODULE_PARM_DESC(conceal, "Enable the CONCEAL CP option while the watchdog is ac
 module_param_named(nowayout, nowayout_info, bool, 0444);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default = CONFIG_WATCHDOG_NOWAYOUT)");
 
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 MODULE_ALIAS("vmwatchdog");
 
 static int __diag288(unsigned int func, unsigned int timeout,
diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
index ff5cf1b48a4d..e46104c2fd94 100644
--- a/drivers/watchdog/f71808e_wdt.c
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -31,8 +31,10 @@
 #define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */
 #define SIO_REG_DEVREV		0x22	/* Device revision */
 #define SIO_REG_MANID		0x23	/* Fintek ID (2 bytes) */
+#define SIO_REG_CLOCK_SEL	0x26	/* Clock select */
 #define SIO_REG_ROM_ADDR_SEL	0x27	/* ROM address select */
 #define SIO_F81866_REG_PORT_SEL	0x27	/* F81866 Multi-Function Register */
+#define SIO_REG_TSI_LEVEL_SEL	0x28	/* TSI Level select */
 #define SIO_REG_MFUNCT1		0x29	/* Multi function select 1 */
 #define SIO_REG_MFUNCT2		0x2a	/* Multi function select 2 */
 #define SIO_REG_MFUNCT3		0x2b	/* Multi function select 3 */
@@ -49,6 +51,7 @@
 #define SIO_F71869A_ID		0x1007	/* Chipset ID */
 #define SIO_F71882_ID		0x0541	/* Chipset ID */
 #define SIO_F71889_ID		0x0723	/* Chipset ID */
+#define SIO_F81803_ID		0x1210	/* Chipset ID */
 #define SIO_F81865_ID		0x0704	/* Chipset ID */
 #define SIO_F81866_ID		0x1010	/* Chipset ID */
 
@@ -108,7 +111,7 @@ MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 	" given initial timeout. Zero (default) disables this feature.");
 
 enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
-	     f81865, f81866};
+	     f81803, f81865, f81866};
 
 static const char *f71808e_names[] = {
 	"f71808fg",
@@ -118,6 +121,7 @@ static const char *f71808e_names[] = {
 	"f71869",
 	"f71882fg",
 	"f71889fg",
+	"f81803",
 	"f81865",
 	"f81866",
 };
@@ -370,6 +374,14 @@ static int watchdog_start(void)
 			superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 		break;
 
+	case f81803:
+		/* Enable TSI Level register bank */
+		superio_clear_bit(watchdog.sioaddr, SIO_REG_CLOCK_SEL, 3);
+		/* Set pin 27 to WDTRST# */
+		superio_outb(watchdog.sioaddr, SIO_REG_TSI_LEVEL_SEL, 0x5f &
+			superio_inb(watchdog.sioaddr, SIO_REG_TSI_LEVEL_SEL));
+		break;
+
 	case f81865:
 		/* Set pin 70 to WDTRST# */
 		superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);
@@ -809,6 +821,9 @@ static int __init f71808e_find(int sioaddr)
 		/* Confirmed (by datasheet) not to have a watchdog. */
 		err = -ENODEV;
 		goto exit;
+	case SIO_F81803_ID:
+		watchdog.type = f81803;
+		break;
 	case SIO_F81865_ID:
 		watchdog.type = f81865;
 		break;
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index c559f706ae7e..156360e37714 100644
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -48,6 +48,7 @@
 
 /* Includes */
 #include <linux/acpi.h>			/* For ACPI support */
+#include <linux/bits.h>			/* For BIT() */
 #include <linux/module.h>		/* For module specific items */
 #include <linux/moduleparam.h>		/* For new moduleparam's */
 #include <linux/types.h>		/* For standard types (like size_t) */
@@ -215,6 +216,23 @@ static int update_no_reboot_bit_mem(void *priv, bool set)
 	return 0;
 }
 
+static int update_no_reboot_bit_cnt(void *priv, bool set)
+{
+	struct iTCO_wdt_private *p = priv;
+	u16 val, newval;
+
+	val = inw(TCO1_CNT(p));
+	if (set)
+		val |= BIT(0);
+	else
+		val &= ~BIT(0);
+	outw(val, TCO1_CNT(p));
+	newval = inw(TCO1_CNT(p));
+
+	/* make sure the update is successful */
+	return val != newval ? -EIO : 0;
+}
+
 static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p,
 		struct itco_wdt_platform_data *pdata)
 {
@@ -224,7 +242,9 @@ static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p,
 		return;
 	}
 
-	if (p->iTCO_version >= 2)
+	if (p->iTCO_version >= 6)
+		p->update_no_reboot_bit = update_no_reboot_bit_cnt;
+	else if (p->iTCO_version >= 2)
 		p->update_no_reboot_bit = update_no_reboot_bit_mem;
 	else if (p->iTCO_version == 1)
 		p->update_no_reboot_bit = update_no_reboot_bit_pci;
@@ -452,7 +472,8 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
 	 * Get the Memory-Mapped GCS or PMC register, we need it for the
 	 * NO_REBOOT flag (TCO v2 and v3).
 	 */
-	if (p->iTCO_version >= 2 && !pdata->update_no_reboot_bit) {
+	if (p->iTCO_version >= 2 && p->iTCO_version < 6 &&
+	    !pdata->update_no_reboot_bit) {
 		p->gcs_pmc_res = platform_get_resource(pdev,
 						       IORESOURCE_MEM,
 						       ICH_RES_MEM_GCS_PMC);
@@ -502,6 +523,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
 
 	/* Clear out the (probably old) status */
 	switch (p->iTCO_version) {
+	case 6:
 	case 5:
 	case 4:
 		outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 32af3974e6bb..8d019a961ccc 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -55,7 +55,7 @@
 
 #define IMX2_WDT_WMCR		0x08		/* Misc Register */
 
-#define IMX2_WDT_MAX_TIME	128
+#define IMX2_WDT_MAX_TIME	128U
 #define IMX2_WDT_DEFAULT_TIME	60		/* in seconds */
 
 #define WDOG_SEC_TO_COUNT(s)	((s * 2 - 1) << 8)
@@ -180,7 +180,7 @@ static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
 {
 	unsigned int actual;
 
-	actual = min(new_timeout, wdog->max_hw_heartbeat_ms * 1000);
+	actual = min(new_timeout, IMX2_WDT_MAX_TIME);
 	__imx2_wdt_set_timeout(wdog, actual);
 	wdog->timeout = new_timeout;
 	return 0;
diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
new file mode 100644
index 000000000000..5ce51026989a
--- /dev/null
+++ b/drivers/watchdog/imx7ulp_wdt.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/watchdog.h>
+
+#define WDOG_CS			0x0
+#define WDOG_CS_CMD32EN		BIT(13)
+#define WDOG_CS_ULK		BIT(11)
+#define WDOG_CS_RCS		BIT(10)
+#define WDOG_CS_EN		BIT(7)
+#define WDOG_CS_UPDATE		BIT(5)
+
+#define WDOG_CNT	0x4
+#define WDOG_TOVAL	0x8
+
+#define REFRESH_SEQ0	0xA602
+#define REFRESH_SEQ1	0xB480
+#define REFRESH		((REFRESH_SEQ1 << 16) | REFRESH_SEQ0)
+
+#define UNLOCK_SEQ0	0xC520
+#define UNLOCK_SEQ1	0xD928
+#define UNLOCK		((UNLOCK_SEQ1 << 16) | UNLOCK_SEQ0)
+
+#define DEFAULT_TIMEOUT	60
+#define MAX_TIMEOUT	128
+#define WDOG_CLOCK_RATE	1000
+
+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 imx7ulp_wdt_device {
+	struct notifier_block restart_handler;
+	struct watchdog_device wdd;
+	void __iomem *base;
+	struct clk *clk;
+};
+
+static inline void imx7ulp_wdt_enable(void __iomem *base, bool enable)
+{
+	u32 val = readl(base + WDOG_CS);
+
+	writel(UNLOCK, base + WDOG_CNT);
+	if (enable)
+		writel(val | WDOG_CS_EN, base + WDOG_CS);
+	else
+		writel(val & ~WDOG_CS_EN, base + WDOG_CS);
+}
+
+static inline bool imx7ulp_wdt_is_enabled(void __iomem *base)
+{
+	u32 val = readl(base + WDOG_CS);
+
+	return val & WDOG_CS_EN;
+}
+
+static int imx7ulp_wdt_ping(struct watchdog_device *wdog)
+{
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+
+	writel(REFRESH, wdt->base + WDOG_CNT);
+
+	return 0;
+}
+
+static int imx7ulp_wdt_start(struct watchdog_device *wdog)
+{
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+
+	imx7ulp_wdt_enable(wdt->base, true);
+
+	return 0;
+}
+
+static int imx7ulp_wdt_stop(struct watchdog_device *wdog)
+{
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+
+	imx7ulp_wdt_enable(wdt->base, false);
+
+	return 0;
+}
+
+static int imx7ulp_wdt_set_timeout(struct watchdog_device *wdog,
+				   unsigned int timeout)
+{
+	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
+	u32 val = WDOG_CLOCK_RATE * timeout;
+
+	writel(UNLOCK, wdt->base + WDOG_CNT);
+	writel(val, wdt->base + WDOG_TOVAL);
+
+	wdog->timeout = timeout;
+
+	return 0;
+}
+
+static const struct watchdog_ops imx7ulp_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = imx7ulp_wdt_start,
+	.stop  = imx7ulp_wdt_stop,
+	.ping  = imx7ulp_wdt_ping,
+	.set_timeout = imx7ulp_wdt_set_timeout,
+};
+
+static const struct watchdog_info imx7ulp_wdt_info = {
+	.identity = "i.MX7ULP watchdog timer",
+	.options  = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+		    WDIOF_MAGICCLOSE,
+};
+
+static inline void imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
+{
+	u32 val;
+
+	/* unlock the wdog for reconfiguration */
+	writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
+	writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
+
+	/* set an initial timeout value in TOVAL */
+	writel(timeout, base + WDOG_TOVAL);
+	/* enable 32bit command sequence and reconfigure */
+	val = BIT(13) | BIT(8) | BIT(5);
+	writel(val, base + WDOG_CS);
+}
+
+static void imx7ulp_wdt_action(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+static int imx7ulp_wdt_probe(struct platform_device *pdev)
+{
+	struct imx7ulp_wdt_device *imx7ulp_wdt;
+	struct device *dev = &pdev->dev;
+	struct watchdog_device *wdog;
+	int ret;
+
+	imx7ulp_wdt = devm_kzalloc(dev, sizeof(*imx7ulp_wdt), GFP_KERNEL);
+	if (!imx7ulp_wdt)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, imx7ulp_wdt);
+
+	imx7ulp_wdt->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(imx7ulp_wdt->base))
+		return PTR_ERR(imx7ulp_wdt->base);
+
+	imx7ulp_wdt->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(imx7ulp_wdt->clk)) {
+		dev_err(dev, "Failed to get watchdog clock\n");
+		return PTR_ERR(imx7ulp_wdt->clk);
+	}
+
+	ret = clk_prepare_enable(imx7ulp_wdt->clk);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(dev, imx7ulp_wdt_action, imx7ulp_wdt->clk);
+	if (ret)
+		return ret;
+
+	wdog = &imx7ulp_wdt->wdd;
+	wdog->info = &imx7ulp_wdt_info;
+	wdog->ops = &imx7ulp_wdt_ops;
+	wdog->min_timeout = 1;
+	wdog->max_timeout = MAX_TIMEOUT;
+	wdog->parent = dev;
+	wdog->timeout = DEFAULT_TIMEOUT;
+
+	watchdog_init_timeout(wdog, 0, dev);
+	watchdog_stop_on_reboot(wdog);
+	watchdog_stop_on_unregister(wdog);
+	watchdog_set_drvdata(wdog, imx7ulp_wdt);
+	imx7ulp_wdt_init(imx7ulp_wdt->base, wdog->timeout * WDOG_CLOCK_RATE);
+
+	return devm_watchdog_register_device(dev, wdog);
+}
+
+static int __maybe_unused imx7ulp_wdt_suspend(struct device *dev)
+{
+	struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
+
+	if (watchdog_active(&imx7ulp_wdt->wdd))
+		imx7ulp_wdt_stop(&imx7ulp_wdt->wdd);
+
+	clk_disable_unprepare(imx7ulp_wdt->clk);
+
+	return 0;
+}
+
+static int __maybe_unused imx7ulp_wdt_resume(struct device *dev)
+{
+	struct imx7ulp_wdt_device *imx7ulp_wdt = dev_get_drvdata(dev);
+	u32 timeout = imx7ulp_wdt->wdd.timeout * 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))
+		imx7ulp_wdt_start(&imx7ulp_wdt->wdd);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imx7ulp_wdt_pm_ops, imx7ulp_wdt_suspend,
+			 imx7ulp_wdt_resume);
+
+static const struct of_device_id imx7ulp_wdt_dt_ids[] = {
+	{ .compatible = "fsl,imx7ulp-wdt", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx7ulp_wdt_dt_ids);
+
+static struct platform_driver imx7ulp_wdt_driver = {
+	.probe		= imx7ulp_wdt_probe,
+	.driver		= {
+		.name	= "imx7ulp-wdt",
+		.pm	= &imx7ulp_wdt_pm_ops,
+		.of_match_table = imx7ulp_wdt_dt_ids,
+	},
+};
+module_platform_driver(imx7ulp_wdt_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("Freescale i.MX7ULP watchdog driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
index 78eaaf75a263..7ea5cf54e94a 100644
--- a/drivers/watchdog/imx_sc_wdt.c
+++ b/drivers/watchdog/imx_sc_wdt.c
@@ -175,12 +175,9 @@ static int imx_sc_wdt_probe(struct platform_device *pdev)
 	watchdog_stop_on_unregister(wdog);
 
 	ret = devm_watchdog_register_device(dev, wdog);
- 
- 	if (ret) {
- 		dev_err(dev, "Failed to register watchdog device\n");
- 		return ret;
- 	}
- 
+	if (ret)
+		return ret;
+
 	ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG,
 				       SC_IRQ_WDOG,
 				       true);
diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index d4a90916dd38..c6052ae54f32 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -162,7 +162,6 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct jz4740_wdt_drvdata *drvdata;
 	struct watchdog_device *jz4740_wdt;
-	int ret;
 
 	drvdata = devm_kzalloc(dev, sizeof(struct jz4740_wdt_drvdata),
 			       GFP_KERNEL);
diff --git a/drivers/watchdog/ks8695_wdt.c b/drivers/watchdog/ks8695_wdt.c
deleted file mode 100644
index 1550ce3c5702..000000000000
--- a/drivers/watchdog/ks8695_wdt.c
+++ /dev/null
@@ -1,319 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Watchdog driver for Kendin/Micrel KS8695.
- *
- * (C) 2007 Andrew Victor
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/types.h>
-#include <linux/watchdog.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <mach/hardware.h>
-
-#define KS8695_TMR_OFFSET	(0xF0000 + 0xE400)
-#define KS8695_TMR_VA		(KS8695_IO_VA + KS8695_TMR_OFFSET)
-
-/*
- * Timer registers
- */
-#define KS8695_TMCON		(0x00)		/* Timer Control Register */
-#define KS8695_T0TC		(0x08)		/* Timer 0 Timeout Count Register */
-#define TMCON_T0EN		(1 << 0)	/* Timer 0 Enable */
-
-/* Timer0 Timeout Counter Register */
-#define T0TC_WATCHDOG		(0xff)		/* Enable watchdog mode */
-
-#define WDT_DEFAULT_TIME	5	/* seconds */
-#define WDT_MAX_TIME		171	/* seconds */
-
-static int wdt_time = WDT_DEFAULT_TIME;
-static bool nowayout = WATCHDOG_NOWAYOUT;
-
-module_param(wdt_time, int, 0);
-MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
-					__MODULE_STRING(WDT_DEFAULT_TIME) ")");
-
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
-module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
-				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-#endif
-
-
-static unsigned long ks8695wdt_busy;
-static DEFINE_SPINLOCK(ks8695_lock);
-
-/* ......................................................................... */
-
-/*
- * Disable the watchdog.
- */
-static inline void ks8695_wdt_stop(void)
-{
-	unsigned long tmcon;
-
-	spin_lock(&ks8695_lock);
-	/* disable timer0 */
-	tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
-	spin_unlock(&ks8695_lock);
-}
-
-/*
- * Enable and reset the watchdog.
- */
-static inline void ks8695_wdt_start(void)
-{
-	unsigned long tmcon;
-	unsigned long tval = wdt_time * KS8695_CLOCK_RATE;
-
-	spin_lock(&ks8695_lock);
-	/* disable timer0 */
-	tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
-
-	/* program timer0 */
-	__raw_writel(tval | T0TC_WATCHDOG, KS8695_TMR_VA + KS8695_T0TC);
-
-	/* re-enable timer0 */
-	tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
-	spin_unlock(&ks8695_lock);
-}
-
-/*
- * Reload the watchdog timer.  (ie, pat the watchdog)
- */
-static inline void ks8695_wdt_reload(void)
-{
-	unsigned long tmcon;
-
-	spin_lock(&ks8695_lock);
-	/* disable, then re-enable timer0 */
-	tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
-	__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
-	spin_unlock(&ks8695_lock);
-}
-
-/*
- * Change the watchdog time interval.
- */
-static int ks8695_wdt_settimeout(int new_time)
-{
-	/*
-	 * All counting occurs at KS8695_CLOCK_RATE / 128 = 0.256 Hz
-	 *
-	 * Since WDV is a 16-bit counter, the maximum period is
-	 * 65536 / 0.256 = 256 seconds.
-	 */
-	if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
-		return -EINVAL;
-
-	/* Set new watchdog time. It will be used when
-	   ks8695_wdt_start() is called. */
-	wdt_time = new_time;
-	return 0;
-}
-
-/* ......................................................................... */
-
-/*
- * Watchdog device is opened, and watchdog starts running.
- */
-static int ks8695_wdt_open(struct inode *inode, struct file *file)
-{
-	if (test_and_set_bit(0, &ks8695wdt_busy))
-		return -EBUSY;
-
-	ks8695_wdt_start();
-	return stream_open(inode, file);
-}
-
-/*
- * Close the watchdog device.
- * If CONFIG_WATCHDOG_NOWAYOUT is NOT defined then the watchdog is also
- *  disabled.
- */
-static int ks8695_wdt_close(struct inode *inode, struct file *file)
-{
-	/* Disable the watchdog when file is closed */
-	if (!nowayout)
-		ks8695_wdt_stop();
-	clear_bit(0, &ks8695wdt_busy);
-	return 0;
-}
-
-static const struct watchdog_info ks8695_wdt_info = {
-	.identity	= "ks8695 watchdog",
-	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
-};
-
-/*
- * Handle commands from user-space.
- */
-static long ks8695_wdt_ioctl(struct file *file, unsigned int cmd,
-							unsigned long arg)
-{
-	void __user *argp = (void __user *)arg;
-	int __user *p = argp;
-	int new_value;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(argp, &ks8695_wdt_info,
-					sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, p);
-	case WDIOC_SETOPTIONS:
-		if (get_user(new_value, p))
-			return -EFAULT;
-		if (new_value & WDIOS_DISABLECARD)
-			ks8695_wdt_stop();
-		if (new_value & WDIOS_ENABLECARD)
-			ks8695_wdt_start();
-		return 0;
-	case WDIOC_KEEPALIVE:
-		ks8695_wdt_reload();	/* pat the watchdog */
-		return 0;
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_value, p))
-			return -EFAULT;
-		if (ks8695_wdt_settimeout(new_value))
-			return -EINVAL;
-		/* Enable new time value */
-		ks8695_wdt_start();
-		/* Return current value */
-		return put_user(wdt_time, p);
-	case WDIOC_GETTIMEOUT:
-		return put_user(wdt_time, p);
-	default:
-		return -ENOTTY;
-	}
-}
-
-/*
- * Pat the watchdog whenever device is written to.
- */
-static ssize_t ks8695_wdt_write(struct file *file, const char *data,
-						size_t len, loff_t *ppos)
-{
-	ks8695_wdt_reload();		/* pat the watchdog */
-	return len;
-}
-
-/* ......................................................................... */
-
-static const struct file_operations ks8695wdt_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.unlocked_ioctl	= ks8695_wdt_ioctl,
-	.open		= ks8695_wdt_open,
-	.release	= ks8695_wdt_close,
-	.write		= ks8695_wdt_write,
-};
-
-static struct miscdevice ks8695wdt_miscdev = {
-	.minor		= WATCHDOG_MINOR,
-	.name		= "watchdog",
-	.fops		= &ks8695wdt_fops,
-};
-
-static int ks8695wdt_probe(struct platform_device *pdev)
-{
-	int res;
-
-	if (ks8695wdt_miscdev.parent)
-		return -EBUSY;
-	ks8695wdt_miscdev.parent = &pdev->dev;
-
-	res = misc_register(&ks8695wdt_miscdev);
-	if (res)
-		return res;
-
-	pr_info("KS8695 Watchdog Timer enabled (%d seconds%s)\n",
-		wdt_time, nowayout ? ", nowayout" : "");
-	return 0;
-}
-
-static int ks8695wdt_remove(struct platform_device *pdev)
-{
-	misc_deregister(&ks8695wdt_miscdev);
-	ks8695wdt_miscdev.parent = NULL;
-
-	return 0;
-}
-
-static void ks8695wdt_shutdown(struct platform_device *pdev)
-{
-	ks8695_wdt_stop();
-}
-
-#ifdef CONFIG_PM
-
-static int ks8695wdt_suspend(struct platform_device *pdev, pm_message_t message)
-{
-	ks8695_wdt_stop();
-	return 0;
-}
-
-static int ks8695wdt_resume(struct platform_device *pdev)
-{
-	if (ks8695wdt_busy)
-		ks8695_wdt_start();
-	return 0;
-}
-
-#else
-#define ks8695wdt_suspend NULL
-#define ks8695wdt_resume	NULL
-#endif
-
-static struct platform_driver ks8695wdt_driver = {
-	.probe		= ks8695wdt_probe,
-	.remove		= ks8695wdt_remove,
-	.shutdown	= ks8695wdt_shutdown,
-	.suspend	= ks8695wdt_suspend,
-	.resume		= ks8695wdt_resume,
-	.driver		= {
-		.name	= "ks8695_wdt",
-	},
-};
-
-static int __init ks8695_wdt_init(void)
-{
-	/* Check that the heartbeat value is within range;
-	   if not reset to the default */
-	if (ks8695_wdt_settimeout(wdt_time)) {
-		ks8695_wdt_settimeout(WDT_DEFAULT_TIME);
-		pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i"
-					", using %d\n", wdt_time, WDT_MAX_TIME);
-	}
-	return platform_driver_register(&ks8695wdt_driver);
-}
-
-static void __exit ks8695_wdt_exit(void)
-{
-	platform_driver_unregister(&ks8695wdt_driver);
-}
-
-module_init(ks8695_wdt_init);
-module_exit(ks8695_wdt_exit);
-
-MODULE_AUTHOR("Andrew Victor");
-MODULE_DESCRIPTION("Watchdog driver for KS8695");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:ks8695_wdt");
diff --git a/drivers/watchdog/nuc900_wdt.c b/drivers/watchdog/nuc900_wdt.c
deleted file mode 100644
index db124cebe838..000000000000
--- a/drivers/watchdog/nuc900_wdt.c
+++ /dev/null
@@ -1,302 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/types.h>
-#include <linux/watchdog.h>
-#include <linux/uaccess.h>
-
-#define REG_WTCR		0x1c
-#define WTCLK			(0x01 << 10)
-#define WTE			(0x01 << 7)	/*wdt enable*/
-#define WTIS			(0x03 << 4)
-#define WTIF			(0x01 << 3)
-#define WTRF			(0x01 << 2)
-#define WTRE			(0x01 << 1)
-#define WTR			(0x01 << 0)
-/*
- * The watchdog time interval can be calculated via following formula:
- * WTIS		real time interval (formula)
- * 0x00		((2^ 14 ) * ((external crystal freq) / 256))seconds
- * 0x01		((2^ 16 ) * ((external crystal freq) / 256))seconds
- * 0x02		((2^ 18 ) * ((external crystal freq) / 256))seconds
- * 0x03		((2^ 20 ) * ((external crystal freq) / 256))seconds
- *
- * The external crystal freq is 15Mhz in the nuc900 evaluation board.
- * So 0x00 = +-0.28 seconds, 0x01 = +-1.12 seconds, 0x02 = +-4.48 seconds,
- * 0x03 = +- 16.92 seconds..
- */
-#define WDT_HW_TIMEOUT		0x02
-#define WDT_TIMEOUT		(HZ/2)
-#define WDT_HEARTBEAT		15
-
-static int heartbeat = WDT_HEARTBEAT;
-module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
-	"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
-
-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) ")");
-
-struct nuc900_wdt {
-	struct clk	 *wdt_clock;
-	struct platform_device *pdev;
-	void __iomem	 *wdt_base;
-	char		 expect_close;
-	struct timer_list timer;
-	spinlock_t       wdt_lock;
-	unsigned long next_heartbeat;
-};
-
-static unsigned long nuc900wdt_busy;
-static struct nuc900_wdt *nuc900_wdt;
-
-static inline void nuc900_wdt_keepalive(void)
-{
-	unsigned int val;
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val |= (WTR | WTIF);
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-}
-
-static inline void nuc900_wdt_start(void)
-{
-	unsigned int val;
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val |= (WTRE | WTE | WTR | WTCLK | WTIF);
-	val &= ~WTIS;
-	val |= (WDT_HW_TIMEOUT << 0x04);
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-
-	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
-	mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
-}
-
-static inline void nuc900_wdt_stop(void)
-{
-	unsigned int val;
-
-	del_timer(&nuc900_wdt->timer);
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val &= ~WTE;
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-}
-
-static inline void nuc900_wdt_ping(void)
-{
-	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
-}
-
-static int nuc900_wdt_open(struct inode *inode, struct file *file)
-{
-
-	if (test_and_set_bit(0, &nuc900wdt_busy))
-		return -EBUSY;
-
-	nuc900_wdt_start();
-
-	return stream_open(inode, file);
-}
-
-static int nuc900_wdt_close(struct inode *inode, struct file *file)
-{
-	if (nuc900_wdt->expect_close == 42)
-		nuc900_wdt_stop();
-	else {
-		dev_crit(&nuc900_wdt->pdev->dev,
-			"Unexpected close, not stopping watchdog!\n");
-		nuc900_wdt_ping();
-	}
-
-	nuc900_wdt->expect_close = 0;
-	clear_bit(0, &nuc900wdt_busy);
-	return 0;
-}
-
-static const struct watchdog_info nuc900_wdt_info = {
-	.identity	= "nuc900 watchdog",
-	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
-						WDIOF_MAGICCLOSE,
-};
-
-static long nuc900_wdt_ioctl(struct file *file,
-					unsigned int cmd, unsigned long arg)
-{
-	void __user *argp = (void __user *)arg;
-	int __user *p = argp;
-	int new_value;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(argp, &nuc900_wdt_info,
-				sizeof(nuc900_wdt_info)) ? -EFAULT : 0;
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, p);
-
-	case WDIOC_KEEPALIVE:
-		nuc900_wdt_ping();
-		return 0;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_value, p))
-			return -EFAULT;
-
-		heartbeat = new_value;
-		nuc900_wdt_ping();
-
-		return put_user(new_value, p);
-	case WDIOC_GETTIMEOUT:
-		return put_user(heartbeat, p);
-	default:
-		return -ENOTTY;
-	}
-}
-
-static ssize_t nuc900_wdt_write(struct file *file, const char __user *data,
-						size_t len, loff_t *ppos)
-{
-	if (!len)
-		return 0;
-
-	/* Scan for magic character */
-	if (!nowayout) {
-		size_t i;
-
-		nuc900_wdt->expect_close = 0;
-
-		for (i = 0; i < len; i++) {
-			char c;
-			if (get_user(c, data + i))
-				return -EFAULT;
-			if (c == 'V') {
-				nuc900_wdt->expect_close = 42;
-				break;
-			}
-		}
-	}
-
-	nuc900_wdt_ping();
-	return len;
-}
-
-static void nuc900_wdt_timer_ping(struct timer_list *unused)
-{
-	if (time_before(jiffies, nuc900_wdt->next_heartbeat)) {
-		nuc900_wdt_keepalive();
-		mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
-	} else
-		dev_warn(&nuc900_wdt->pdev->dev, "Will reset the machine !\n");
-}
-
-static const struct file_operations nuc900wdt_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.unlocked_ioctl	= nuc900_wdt_ioctl,
-	.open		= nuc900_wdt_open,
-	.release	= nuc900_wdt_close,
-	.write		= nuc900_wdt_write,
-};
-
-static struct miscdevice nuc900wdt_miscdev = {
-	.minor		= WATCHDOG_MINOR,
-	.name		= "watchdog",
-	.fops		= &nuc900wdt_fops,
-};
-
-static int nuc900wdt_probe(struct platform_device *pdev)
-{
-	int ret = 0;
-
-	nuc900_wdt = devm_kzalloc(&pdev->dev, sizeof(*nuc900_wdt),
-				GFP_KERNEL);
-	if (!nuc900_wdt)
-		return -ENOMEM;
-
-	nuc900_wdt->pdev = pdev;
-
-	spin_lock_init(&nuc900_wdt->wdt_lock);
-
-	nuc900_wdt->wdt_base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(nuc900_wdt->wdt_base))
-		return PTR_ERR(nuc900_wdt->wdt_base);
-
-	nuc900_wdt->wdt_clock = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(nuc900_wdt->wdt_clock)) {
-		dev_err(&pdev->dev, "failed to find watchdog clock source\n");
-		return PTR_ERR(nuc900_wdt->wdt_clock);
-	}
-
-	clk_enable(nuc900_wdt->wdt_clock);
-
-	timer_setup(&nuc900_wdt->timer, nuc900_wdt_timer_ping, 0);
-
-	ret = misc_register(&nuc900wdt_miscdev);
-	if (ret) {
-		dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
-			WATCHDOG_MINOR, ret);
-		goto err_clk;
-	}
-
-	return 0;
-
-err_clk:
-	clk_disable(nuc900_wdt->wdt_clock);
-	return ret;
-}
-
-static int nuc900wdt_remove(struct platform_device *pdev)
-{
-	misc_deregister(&nuc900wdt_miscdev);
-
-	clk_disable(nuc900_wdt->wdt_clock);
-
-	return 0;
-}
-
-static struct platform_driver nuc900wdt_driver = {
-	.probe		= nuc900wdt_probe,
-	.remove		= nuc900wdt_remove,
-	.driver		= {
-		.name	= "nuc900-wdt",
-	},
-};
-
-module_platform_driver(nuc900wdt_driver);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("Watchdog driver for NUC900");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-wdt");
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index cdb0d174c5e2..1cccf8eb1c5d 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -35,7 +35,15 @@
  * Watchdog timer block registers.
  */
 #define TIMER_CTRL		0x0000
-#define TIMER_A370_STATUS	0x04
+#define TIMER1_FIXED_ENABLE_BIT	BIT(12)
+#define WDT_AXP_FIXED_ENABLE_BIT BIT(10)
+#define TIMER1_ENABLE_BIT	BIT(2)
+
+#define TIMER_A370_STATUS	0x0004
+#define WDT_A370_EXPIRED	BIT(31)
+#define TIMER1_STATUS_BIT	BIT(8)
+
+#define TIMER1_VAL_OFF		0x001c
 
 #define WDT_MAX_CYCLE_COUNT	0xffffffff
 
@@ -43,9 +51,6 @@
 #define WDT_A370_RATIO_SHIFT	5
 #define WDT_A370_RATIO		(1 << WDT_A370_RATIO_SHIFT)
 
-#define WDT_AXP_FIXED_ENABLE_BIT BIT(10)
-#define WDT_A370_EXPIRED	BIT(31)
-
 static bool nowayout = WATCHDOG_NOWAYOUT;
 static int heartbeat = -1;		/* module parameter (seconds) */
 
@@ -158,6 +163,7 @@ static int armadaxp_wdt_clock_init(struct platform_device *pdev,
 				   struct orion_watchdog *dev)
 {
 	int ret;
+	u32 val;
 
 	dev->clk = of_clk_get_by_name(pdev->dev.of_node, "fixed");
 	if (IS_ERR(dev->clk))
@@ -168,10 +174,9 @@ static int armadaxp_wdt_clock_init(struct platform_device *pdev,
 		return ret;
 	}
 
-	/* Enable the fixed watchdog clock input */
-	atomic_io_modify(dev->reg + TIMER_CTRL,
-			 WDT_AXP_FIXED_ENABLE_BIT,
-			 WDT_AXP_FIXED_ENABLE_BIT);
+	/* Fix the wdt and timer1 clock freqency to 25MHz */
+	val = WDT_AXP_FIXED_ENABLE_BIT | TIMER1_FIXED_ENABLE_BIT;
+	atomic_io_modify(dev->reg + TIMER_CTRL, val, val);
 
 	dev->clk_rate = clk_get_rate(dev->clk);
 	return 0;
@@ -183,6 +188,10 @@ static int orion_wdt_ping(struct watchdog_device *wdt_dev)
 	/* Reload watchdog duration */
 	writel(dev->clk_rate * wdt_dev->timeout,
 	       dev->reg + dev->data->wdt_counter_offset);
+	if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
+		writel(dev->clk_rate * (wdt_dev->timeout - wdt_dev->pretimeout),
+		       dev->reg + TIMER1_VAL_OFF);
+
 	return 0;
 }
 
@@ -194,13 +203,18 @@ static int armada375_start(struct watchdog_device *wdt_dev)
 	/* Set watchdog duration */
 	writel(dev->clk_rate * wdt_dev->timeout,
 	       dev->reg + dev->data->wdt_counter_offset);
+	if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
+		writel(dev->clk_rate * (wdt_dev->timeout - wdt_dev->pretimeout),
+		       dev->reg + TIMER1_VAL_OFF);
 
 	/* Clear the watchdog expiration bit */
 	atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
 
 	/* Enable watchdog timer */
-	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
-						dev->data->wdt_enable_bit);
+	reg = dev->data->wdt_enable_bit;
+	if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
+		reg |= TIMER1_ENABLE_BIT;
+	atomic_io_modify(dev->reg + TIMER_CTRL, reg, reg);
 
 	/* Enable reset on watchdog */
 	reg = readl(dev->rstout);
@@ -277,7 +291,7 @@ static int orion_stop(struct watchdog_device *wdt_dev)
 static int armada375_stop(struct watchdog_device *wdt_dev)
 {
 	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
-	u32 reg;
+	u32 reg, mask;
 
 	/* Disable reset on watchdog */
 	atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit,
@@ -287,7 +301,10 @@ static int armada375_stop(struct watchdog_device *wdt_dev)
 	writel(reg, dev->rstout);
 
 	/* Disable watchdog timer */
-	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
+	mask = dev->data->wdt_enable_bit;
+	if (wdt_dev->info->options & WDIOF_PRETIMEOUT)
+		mask |= TIMER1_ENABLE_BIT;
+	atomic_io_modify(dev->reg + TIMER_CTRL, mask, 0);
 
 	return 0;
 }
@@ -349,7 +366,7 @@ static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev)
 	return readl(dev->reg + dev->data->wdt_counter_offset) / dev->clk_rate;
 }
 
-static const struct watchdog_info orion_wdt_info = {
+static struct watchdog_info orion_wdt_info = {
 	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 	.identity = "Orion Watchdog",
 };
@@ -368,6 +385,16 @@ static irqreturn_t orion_wdt_irq(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t orion_wdt_pre_irq(int irq, void *devid)
+{
+	struct orion_watchdog *dev = devid;
+
+	atomic_io_modify(dev->reg + TIMER_A370_STATUS,
+			 TIMER1_STATUS_BIT, 0);
+	watchdog_notify_pretimeout(&dev->wdt);
+	return IRQ_HANDLED;
+}
+
 /*
  * The original devicetree binding for this driver specified only
  * one memory resource, so in order to keep DT backwards compatibility
@@ -589,6 +616,19 @@ static int orion_wdt_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* Optional 2nd interrupt for pretimeout */
+	irq = platform_get_irq(pdev, 1);
+	if (irq > 0) {
+		orion_wdt_info.options |= WDIOF_PRETIMEOUT;
+		ret = devm_request_irq(&pdev->dev, irq, orion_wdt_pre_irq,
+				       0, pdev->name, dev);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to request IRQ\n");
+			goto disable_clk;
+		}
+	}
+
+
 	watchdog_set_nowayout(&dev->wdt, nowayout);
 	ret = watchdog_register_device(&dev->wdt);
 	if (ret)
diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 7be7f87be28f..a494543d3ae1 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -1,8 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (c) 2014, The Linux Foundation. All rights reserved.
  */
+#include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -19,6 +21,9 @@ enum wdt_reg {
 	WDT_BITE_TIME,
 };
 
+#define QCOM_WDT_ENABLE		BIT(0)
+#define QCOM_WDT_ENABLE_IRQ	BIT(1)
+
 static const u32 reg_offset_data_apcs_tmr[] = {
 	[WDT_RST] = 0x38,
 	[WDT_EN] = 0x40,
@@ -37,7 +42,6 @@ static const u32 reg_offset_data_kpss[] = {
 
 struct qcom_wdt {
 	struct watchdog_device	wdd;
-	struct clk		*clk;
 	unsigned long		rate;
 	void __iomem		*base;
 	const u32		*layout;
@@ -54,15 +58,35 @@ struct qcom_wdt *to_qcom_wdt(struct watchdog_device *wdd)
 	return container_of(wdd, struct qcom_wdt, wdd);
 }
 
+static inline int qcom_get_enable(struct watchdog_device *wdd)
+{
+	int enable = QCOM_WDT_ENABLE;
+
+	if (wdd->pretimeout)
+		enable |= QCOM_WDT_ENABLE_IRQ;
+
+	return enable;
+}
+
+static irqreturn_t qcom_wdt_isr(int irq, void *arg)
+{
+	struct watchdog_device *wdd = arg;
+
+	watchdog_notify_pretimeout(wdd);
+
+	return IRQ_HANDLED;
+}
+
 static int qcom_wdt_start(struct watchdog_device *wdd)
 {
 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);
+	unsigned int bark = wdd->timeout - wdd->pretimeout;
 
 	writel(0, wdt_addr(wdt, WDT_EN));
 	writel(1, wdt_addr(wdt, WDT_RST));
-	writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));
+	writel(bark * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));
 	writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));
-	writel(1, wdt_addr(wdt, WDT_EN));
+	writel(qcom_get_enable(wdd), wdt_addr(wdt, WDT_EN));
 	return 0;
 }
 
@@ -89,6 +113,13 @@ static int qcom_wdt_set_timeout(struct watchdog_device *wdd,
 	return qcom_wdt_start(wdd);
 }
 
+static int qcom_wdt_set_pretimeout(struct watchdog_device *wdd,
+				   unsigned int timeout)
+{
+	wdd->pretimeout = timeout;
+	return qcom_wdt_start(wdd);
+}
+
 static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
 			    void *data)
 {
@@ -105,7 +136,7 @@ static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
 	writel(1, wdt_addr(wdt, WDT_RST));
 	writel(timeout, wdt_addr(wdt, WDT_BARK_TIME));
 	writel(timeout, wdt_addr(wdt, WDT_BITE_TIME));
-	writel(1, wdt_addr(wdt, WDT_EN));
+	writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));
 
 	/*
 	 * Actually make sure the above sequence hits hardware before sleeping.
@@ -121,6 +152,7 @@ static const struct watchdog_ops qcom_wdt_ops = {
 	.stop		= qcom_wdt_stop,
 	.ping		= qcom_wdt_ping,
 	.set_timeout	= qcom_wdt_set_timeout,
+	.set_pretimeout	= qcom_wdt_set_pretimeout,
 	.restart        = qcom_wdt_restart,
 	.owner		= THIS_MODULE,
 };
@@ -133,6 +165,15 @@ static const struct watchdog_info qcom_wdt_info = {
 	.identity	= KBUILD_MODNAME,
 };
 
+static const struct watchdog_info qcom_wdt_pt_info = {
+	.options	= WDIOF_KEEPALIVEPING
+			| WDIOF_MAGICCLOSE
+			| WDIOF_SETTIMEOUT
+			| WDIOF_PRETIMEOUT
+			| WDIOF_CARDRESET,
+	.identity	= KBUILD_MODNAME,
+};
+
 static void qcom_clk_disable_unprepare(void *data)
 {
 	clk_disable_unprepare(data);
@@ -146,7 +187,8 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	const u32 *regs;
 	u32 percpu_offset;
-	int ret;
+	int irq, ret;
+	struct clk *clk;
 
 	regs = of_device_get_match_data(dev);
 	if (!regs) {
@@ -173,19 +215,18 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(wdt->base))
 		return PTR_ERR(wdt->base);
 
-	wdt->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(wdt->clk)) {
+	clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(clk)) {
 		dev_err(dev, "failed to get input clock\n");
-		return PTR_ERR(wdt->clk);
+		return PTR_ERR(clk);
 	}
 
-	ret = clk_prepare_enable(wdt->clk);
+	ret = clk_prepare_enable(clk);
 	if (ret) {
 		dev_err(dev, "failed to setup clock\n");
 		return ret;
 	}
-	ret = devm_add_action_or_reset(dev, qcom_clk_disable_unprepare,
-				       wdt->clk);
+	ret = devm_add_action_or_reset(dev, qcom_clk_disable_unprepare, clk);
 	if (ret)
 		return ret;
 
@@ -197,14 +238,31 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 	 * that it would bite before a second elapses it's usefulness is
 	 * limited.  Bail if this is the case.
 	 */
-	wdt->rate = clk_get_rate(wdt->clk);
+	wdt->rate = clk_get_rate(clk);
 	if (wdt->rate == 0 ||
 	    wdt->rate > 0x10000000U) {
 		dev_err(dev, "invalid clock rate\n");
 		return -EINVAL;
 	}
 
-	wdt->wdd.info = &qcom_wdt_info;
+	/* check if there is pretimeout support */
+	irq = platform_get_irq(pdev, 0);
+	if (irq > 0) {
+		ret = devm_request_irq(dev, irq, qcom_wdt_isr,
+				       IRQF_TRIGGER_RISING,
+				       "wdt_bark", &wdt->wdd);
+		if (ret)
+			return ret;
+
+		wdt->wdd.info = &qcom_wdt_pt_info;
+		wdt->wdd.pretimeout = 1;
+	} else {
+		if (irq == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		wdt->wdd.info = &qcom_wdt_info;
+	}
+
 	wdt->wdd.ops = &qcom_wdt_ops;
 	wdt->wdd.min_timeout = 1;
 	wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
diff --git a/drivers/watchdog/sprd_wdt.c b/drivers/watchdog/sprd_wdt.c
index edba4e278685..0bb17b046140 100644
--- a/drivers/watchdog/sprd_wdt.c
+++ b/drivers/watchdog/sprd_wdt.c
@@ -284,10 +284,8 @@ static int sprd_wdt_probe(struct platform_device *pdev)
 	}
 
 	wdt->irq = platform_get_irq(pdev, 0);
-	if (wdt->irq < 0) {
-		dev_err(dev, "failed to get IRQ resource\n");
+	if (wdt->irq < 0)
 		return wdt->irq;
-	}
 
 	ret = devm_request_irq(dev, wdt->irq, sprd_wdt_isr, IRQF_NO_SUSPEND,
 			       "sprd-wdt", (void *)wdt);
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index dec660c509b3..4a363a8b2d20 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -21,8 +21,11 @@
 #include <linux/version.h>
 #include <linux/watchdog.h>
 
+#include <asm/unaligned.h>
+
 #define ZIIRAVE_TIMEOUT_MIN	3
 #define ZIIRAVE_TIMEOUT_MAX	255
+#define ZIIRAVE_TIMEOUT_DEFAULT	30
 
 #define ZIIRAVE_PING_VALUE	0x0
 
@@ -48,16 +51,12 @@ static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
 
 #define ZIIRAVE_FIRM_PKT_TOTAL_SIZE	20
 #define ZIIRAVE_FIRM_PKT_DATA_SIZE	16
-#define ZIIRAVE_FIRM_FLASH_MEMORY_START	0x1600
-#define ZIIRAVE_FIRM_FLASH_MEMORY_END	0x2bbf
+#define ZIIRAVE_FIRM_FLASH_MEMORY_START	(2 * 0x1600)
+#define ZIIRAVE_FIRM_FLASH_MEMORY_END	(2 * 0x2bbf)
+#define ZIIRAVE_FIRM_PAGE_SIZE		128
 
 /* Received and ready for next Download packet. */
 #define ZIIRAVE_FIRM_DOWNLOAD_ACK	1
-/* Currently writing to flash. Retry Download status in a moment! */
-#define ZIIRAVE_FIRM_DOWNLOAD_BUSY	2
-
-/* Wait for ACK timeout in ms */
-#define ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT	50
 
 /* Firmware commands */
 #define ZIIRAVE_CMD_DOWNLOAD_START		0x10
@@ -68,6 +67,12 @@ static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
 #define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER		0x0c
 #define ZIIRAVE_CMD_DOWNLOAD_PACKET		0x0e
 
+#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC	1
+#define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC	1
+
+#define ZIIRAVE_FW_VERSION_FMT	"02.%02u.%02u"
+#define ZIIRAVE_BL_VERSION_FMT	"01.%02u.%02u"
+
 struct ziirave_wdt_rev {
 	unsigned char major;
 	unsigned char minor;
@@ -165,67 +170,37 @@ static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
 	return ret;
 }
 
-static int ziirave_firm_wait_for_ack(struct watchdog_device *wdd)
+static int ziirave_firm_read_ack(struct watchdog_device *wdd)
 {
 	struct i2c_client *client = to_i2c_client(wdd->parent);
 	int ret;
-	unsigned long timeout;
 
-	timeout = jiffies + msecs_to_jiffies(ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT);
-	do {
-		if (time_after(jiffies, timeout))
-			return -ETIMEDOUT;
-
-		usleep_range(5000, 10000);
-
-		ret = i2c_smbus_read_byte(client);
-		if (ret < 0) {
-			dev_err(&client->dev, "Failed to read byte\n");
-			return ret;
-		}
-	} while (ret == ZIIRAVE_FIRM_DOWNLOAD_BUSY);
+	ret = i2c_smbus_read_byte(client);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read status byte\n");
+		return ret;
+	}
 
 	return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;
 }
 
-static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u16 addr)
+static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr)
 {
 	struct i2c_client *client = to_i2c_client(wdd->parent);
+	const u16 addr16 = (u16)addr / 2;
 	u8 address[2];
 
-	address[0] = addr & 0xff;
-	address[1] = (addr >> 8) & 0xff;
+	put_unaligned_le16(addr16, address);
 
 	return i2c_smbus_write_block_data(client,
 					  ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR,
-					  ARRAY_SIZE(address), address);
-}
-
-static int ziirave_firm_write_block_data(struct watchdog_device *wdd,
-					 u8 command, u8 length, const u8 *data,
-					 bool wait_for_ack)
-{
-	struct i2c_client *client = to_i2c_client(wdd->parent);
-	int ret;
-
-	ret = i2c_smbus_write_block_data(client, command, length, data);
-	if (ret) {
-		dev_err(&client->dev,
-			"Failed to send command 0x%02x: %d\n", command, ret);
-		return ret;
-	}
-
-	if (wait_for_ack)
-		ret = ziirave_firm_wait_for_ack(wdd);
-
-	return ret;
+					  sizeof(address), address);
 }
 
-static int ziirave_firm_write_byte(struct watchdog_device *wdd, u8 command,
-				   u8 byte, bool wait_for_ack)
+static bool ziirave_firm_addr_readonly(u32 addr)
 {
-	return ziirave_firm_write_block_data(wdd, command, 1, &byte,
-					     wait_for_ack);
+	return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
+	       addr > ZIIRAVE_FIRM_FLASH_MEMORY_END;
 }
 
 /*
@@ -240,35 +215,53 @@ static int ziirave_firm_write_byte(struct watchdog_device *wdd, u8 command,
  *     Data0 .. Data15: Array of 16 bytes of data.
  *     Checksum: Checksum byte to verify data integrity.
  */
-static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
-				  const struct ihex_binrec *rec)
+static int __ziirave_firm_write_pkt(struct watchdog_device *wdd,
+				    u32 addr, const u8 *data, u8 len)
 {
+	const u16 addr16 = (u16)addr / 2;
 	struct i2c_client *client = to_i2c_client(wdd->parent);
 	u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE];
 	int ret;
-	u16 addr;
 
-	memset(packet, 0, ARRAY_SIZE(packet));
+	/* Check max data size */
+	if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
+		dev_err(&client->dev, "Firmware packet too long (%d)\n",
+			len);
+		return -EMSGSIZE;
+	}
+
+	/*
+	 * Ignore packets that are targeting program memory outisde of
+	 * app partition, since they will be ignored by the
+	 * bootloader. At the same time, we need to make sure we'll
+	 * allow zero length packet that will be sent as the last step
+	 * of firmware update
+	 */
+	if (len && ziirave_firm_addr_readonly(addr))
+		return 0;
 
 	/* Packet length */
-	packet[0] = (u8)be16_to_cpu(rec->len);
+	packet[0] = len;
 	/* Packet address */
-	addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
-	packet[1] = addr & 0xff;
-	packet[2] = (addr & 0xff00) >> 8;
+	put_unaligned_le16(addr16, packet + 1);
 
-	/* Packet data */
-	if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE)
-		return -EMSGSIZE;
-	memcpy(packet + 3, rec->data, be16_to_cpu(rec->len));
+	memcpy(packet + 3, data, len);
+	memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len);
 
 	/* Packet checksum */
-	for (i = 0; i < ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1; i++)
+	for (i = 0; i < len + 3; i++)
 		checksum += packet[i];
 	packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;
 
-	ret = ziirave_firm_write_block_data(wdd, ZIIRAVE_CMD_DOWNLOAD_PACKET,
-					    ARRAY_SIZE(packet), packet, true);
+	ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET,
+					 sizeof(packet), packet);
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to send DOWNLOAD_PACKET: %d\n", ret);
+		return ret;
+	}
+
+	ret = ziirave_firm_read_ack(wdd);
 	if (ret)
 		dev_err(&client->dev,
 		      "Failed to write firmware packet at address 0x%04x: %d\n",
@@ -277,6 +270,30 @@ static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
 	return ret;
 }
 
+static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
+				  u32 addr, const u8 *data, u8 len)
+{
+	const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE -
+		(addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE));
+	int ret;
+
+	if (len > max_write_len) {
+		/*
+		 * If data crossed page boundary we need to split this
+		 * write in two
+		 */
+		ret = __ziirave_firm_write_pkt(wdd, addr, data, max_write_len);
+		if (ret)
+			return ret;
+
+		addr += max_write_len;
+		data += max_write_len;
+		len  -= max_write_len;
+	}
+
+	return __ziirave_firm_write_pkt(wdd, addr, data, len);
+}
+
 static int ziirave_firm_verify(struct watchdog_device *wdd,
 			       const struct firmware *fw)
 {
@@ -284,16 +301,12 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
 	const struct ihex_binrec *rec;
 	int i, ret;
 	u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE];
-	u16 addr;
 
 	for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
-		/* Zero length marks end of records */
-		if (!be16_to_cpu(rec->len))
-			break;
+		const u16 len = be16_to_cpu(rec->len);
+		const u32 addr = be32_to_cpu(rec->addr);
 
-		addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
-		if (addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
-		    addr > ZIIRAVE_FIRM_FLASH_MEMORY_END)
+		if (ziirave_firm_addr_readonly(addr))
 			continue;
 
 		ret = ziirave_firm_set_read_addr(wdd, addr);
@@ -304,7 +317,7 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
 			return ret;
 		}
 
-		for (i = 0; i < ARRAY_SIZE(data); i++) {
+		for (i = 0; i < len; i++) {
 			ret = i2c_smbus_read_byte_data(client,
 						ZIIRAVE_CMD_DOWNLOAD_READ_BYTE);
 			if (ret < 0) {
@@ -315,7 +328,7 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
 			data[i] = ret;
 		}
 
-		if (memcmp(data, rec->data, be16_to_cpu(rec->len))) {
+		if (memcmp(data, rec->data, len)) {
 			dev_err(&client->dev,
 				"Firmware mismatch at address 0x%04x\n", addr);
 			return -EINVAL;
@@ -329,97 +342,45 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
 			       const struct firmware *fw)
 {
 	struct i2c_client *client = to_i2c_client(wdd->parent);
-	int ret, words_till_page_break;
 	const struct ihex_binrec *rec;
-	struct ihex_binrec *rec_new;
+	int ret;
 
-	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 1,
-				      false);
-	if (ret)
+	ret = i2c_smbus_write_byte_data(client,
+					ZIIRAVE_CMD_JUMP_TO_BOOTLOADER,
+					ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC);
+	if (ret) {
+		dev_err(&client->dev, "Failed to jump to bootloader\n");
 		return ret;
+	}
 
 	msleep(500);
 
-	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_START, 1, true);
-	if (ret)
+	ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START);
+	if (ret) {
+		dev_err(&client->dev, "Failed to start download\n");
 		return ret;
+	}
+
+	ret = ziirave_firm_read_ack(wdd);
+	if (ret) {
+		dev_err(&client->dev, "No ACK for start download\n");
+		return ret;
+	}
 
 	msleep(500);
 
 	for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
-		/* Zero length marks end of records */
-		if (!be16_to_cpu(rec->len))
-			break;
-
-		/* Check max data size */
-		if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
-			dev_err(&client->dev, "Firmware packet too long (%d)\n",
-				be16_to_cpu(rec->len));
-			return -EMSGSIZE;
-		}
-
-		/* Calculate words till page break */
-		words_till_page_break = (64 - ((be32_to_cpu(rec->addr) >> 1) &
-					 0x3f));
-		if ((be16_to_cpu(rec->len) >> 1) > words_till_page_break) {
-			/*
-			 * Data in passes page boundary, so we need to split in
-			 * two blocks of data. Create a packet with the first
-			 * block of data.
-			 */
-			rec_new = kzalloc(sizeof(struct ihex_binrec) +
-					  (words_till_page_break << 1),
-					  GFP_KERNEL);
-			if (!rec_new)
-				return -ENOMEM;
-
-			rec_new->len = cpu_to_be16(words_till_page_break << 1);
-			rec_new->addr = rec->addr;
-			memcpy(rec_new->data, rec->data,
-			       be16_to_cpu(rec_new->len));
-
-			ret = ziirave_firm_write_pkt(wdd, rec_new);
-			kfree(rec_new);
-			if (ret)
-				return ret;
-
-			/* Create a packet with the second block of data */
-			rec_new = kzalloc(sizeof(struct ihex_binrec) +
-					  be16_to_cpu(rec->len) -
-					  (words_till_page_break << 1),
-					  GFP_KERNEL);
-			if (!rec_new)
-				return -ENOMEM;
-
-			/* Remaining bytes */
-			rec_new->len = rec->len -
-				       cpu_to_be16(words_till_page_break << 1);
-
-			rec_new->addr = cpu_to_be32(be32_to_cpu(rec->addr) +
-					(words_till_page_break << 1));
-
-			memcpy(rec_new->data,
-			       rec->data + (words_till_page_break << 1),
-			       be16_to_cpu(rec_new->len));
-
-			ret = ziirave_firm_write_pkt(wdd, rec_new);
-			kfree(rec_new);
-			if (ret)
-				return ret;
-		} else {
-			ret = ziirave_firm_write_pkt(wdd, rec);
-			if (ret)
-				return ret;
-		}
+		ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr),
+					     rec->data, be16_to_cpu(rec->len));
+		if (ret)
+			return ret;
 	}
 
-	/* For end of download, the length field will be set to 0 */
-	rec_new = kzalloc(sizeof(struct ihex_binrec) + 1, GFP_KERNEL);
-	if (!rec_new)
-		return -ENOMEM;
-
-	ret = ziirave_firm_write_pkt(wdd, rec_new);
-	kfree(rec_new);
+	/*
+	 * Finish firmware download process by sending a zero length
+	 * payload
+	 */
+	ret = ziirave_firm_write_pkt(wdd, 0, NULL, 0);
 	if (ret) {
 		dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret);
 		return ret;
@@ -437,15 +398,22 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
 	}
 
 	/* End download operation */
-	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_END, 1, false);
-	if (ret)
+	ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END);
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to end firmware download: %d\n", ret);
 		return ret;
+	}
 
 	/* Reset the processor */
-	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_RESET_PROCESSOR, 1,
-				      false);
-	if (ret)
+	ret = i2c_smbus_write_byte_data(client,
+					ZIIRAVE_CMD_RESET_PROCESSOR,
+					ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC);
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to reset the watchdog: %d\n", ret);
 		return ret;
+	}
 
 	msleep(500);
 
@@ -478,7 +446,7 @@ static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
+	ret = sprintf(buf, ZIIRAVE_FW_VERSION_FMT, w_priv->firmware_rev.major,
 		      w_priv->firmware_rev.minor);
 
 	mutex_unlock(&w_priv->sysfs_mutex);
@@ -501,7 +469,7 @@ static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
+	ret = sprintf(buf, ZIIRAVE_BL_VERSION_FMT, w_priv->bootloader_rev.major,
 		      w_priv->bootloader_rev.minor);
 
 	mutex_unlock(&w_priv->sysfs_mutex);
@@ -568,7 +536,8 @@ static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev,
 		goto unlock_mutex;
 	}
 
-	dev_info(&client->dev, "Firmware updated to version 02.%02u.%02u\n",
+	dev_info(&client->dev,
+		 "Firmware updated to version " ZIIRAVE_FW_VERSION_FMT "\n",
 		 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);
 
 	/* Restore the watchdog timeout */
@@ -611,7 +580,7 @@ static int ziirave_wdt_init_duration(struct i2c_client *client)
 						   &reset_duration);
 		if (ret) {
 			dev_info(&client->dev,
-				 "Unable to set reset pulse duration, using default\n");
+			 "No reset pulse duration specified, using default\n");
 			return 0;
 		}
 	}
@@ -633,7 +602,10 @@ static int ziirave_wdt_probe(struct i2c_client *client,
 	struct ziirave_wdt_data *w_priv;
 	int val;
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE |
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
 		return -ENODEV;
 
 	w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
@@ -658,57 +630,80 @@ static int ziirave_wdt_probe(struct i2c_client *client,
 	 */
 	if (w_priv->wdd.timeout == 0) {
 		val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
-		if (val < 0)
+		if (val < 0) {
+			dev_err(&client->dev, "Failed to read timeout\n");
 			return val;
+		}
 
-		if (val < ZIIRAVE_TIMEOUT_MIN)
-			return -ENODEV;
+		if (val > ZIIRAVE_TIMEOUT_MAX ||
+		    val < ZIIRAVE_TIMEOUT_MIN)
+			val = ZIIRAVE_TIMEOUT_DEFAULT;
 
 		w_priv->wdd.timeout = val;
-	} else {
-		ret = ziirave_wdt_set_timeout(&w_priv->wdd,
-					      w_priv->wdd.timeout);
-		if (ret)
-			return ret;
+	}
 
-		dev_info(&client->dev, "Timeout set to %ds.",
-			 w_priv->wdd.timeout);
+	ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
+	if (ret) {
+		dev_err(&client->dev, "Failed to set timeout\n");
+		return ret;
 	}
 
+	dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout);
+
 	watchdog_set_nowayout(&w_priv->wdd, nowayout);
 
 	i2c_set_clientdata(client, w_priv);
 
 	/* If in unconfigured state, set to stopped */
 	val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
-	if (val < 0)
+	if (val < 0) {
+		dev_err(&client->dev, "Failed to read state\n");
 		return val;
+	}
 
 	if (val == ZIIRAVE_STATE_INITIAL)
 		ziirave_wdt_stop(&w_priv->wdd);
 
 	ret = ziirave_wdt_init_duration(client);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev, "Failed to init duration\n");
 		return ret;
+	}
 
 	ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,
 				   ZIIRAVE_WDT_FIRM_VER_MAJOR);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev, "Failed to read firmware version\n");
 		return ret;
+	}
+
+	dev_info(&client->dev,
+		 "Firmware version: " ZIIRAVE_FW_VERSION_FMT "\n",
+		 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);
 
 	ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,
 				   ZIIRAVE_WDT_BOOT_VER_MAJOR);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev, "Failed to read bootloader version\n");
 		return ret;
+	}
+
+	dev_info(&client->dev,
+		 "Bootloader version: " ZIIRAVE_BL_VERSION_FMT "\n",
+		 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor);
 
 	w_priv->reset_reason = i2c_smbus_read_byte_data(client,
 						ZIIRAVE_WDT_RESET_REASON);
-	if (w_priv->reset_reason < 0)
+	if (w_priv->reset_reason < 0) {
+		dev_err(&client->dev, "Failed to read reset reason\n");
 		return w_priv->reset_reason;
+	}
 
 	if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||
-	    !ziirave_reasons[w_priv->reset_reason])
+	    !ziirave_reasons[w_priv->reset_reason]) {
+		dev_err(&client->dev, "Invalid reset reason\n");
 		return -ENODEV;
+	}
 
 	ret = watchdog_register_device(&w_priv->wdd);