watchdog: add driver for max42500-wdt

The MAX42500 contains a programmable watchdog and the watchdog can be
used either as a simple windowed watchdog or a challenge/response watchdog,
which is accessible through the I2C interface, along with a configurable
RESET output.

Signed-off-by: Kent Libetario <[email protected]>

Author: kentlibe

drivers/watchdog/Kconfig

@@ -703,6 +703,16 @@ config MAX77620_WATCHDOG
 	  MAX77620 chips. To compile this driver as a module,
 	  choose M here: the module will be called max77620_wdt.
 
+config MAX42500_WDT
+	tristate "MAX42500 Programmable Windowed Watchdog"
+	depends on MFD_MAX42500
+	select WATCHDOG_CORE
+	help
+	  This is the driver for the MAX42500 watchdog timer.
+	  Say 'Y' here to enable the watchdog timer support for
+	  MAX42500 chips. To compile this driver as a module,
+	  choose M here: the module will be called max42500-wdt.
+
 config IMX2_WDT
 	tristate "IMX2+ Watchdog"
 	depends on ARCH_MXC || ARCH_LAYERSCAPE || COMPILE_TEST

drivers/watchdog/Makefile

@@ -226,6 +226,7 @@ obj-$(CONFIG_GPIO_WATCHDOG)	+= gpio_wdt.o
 obj-$(CONFIG_WDAT_WDT) += wdat_wdt.o
 obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
 obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
+obj-$(CONFIG_MAX42500_WDT) += max42500-wdt.o
 obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
 obj-$(CONFIG_MAX77620_WATCHDOG) += max77620_wdt.o
 obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o