[WATCHDOG] Add watchdog driver for NUC900

Add watchdog device driver for the Nuvoton NUC900 series SoCs.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 1940a08..3229889 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -266,6 +266,15 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called stmp3xxx_wdt.
 
+config NUC900_WATCHDOG
+	tristate "Nuvoton NUC900 watchdog"
+	depends on ARCH_W90X900
+	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.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT