watchdog: add driver for the Atheros AR71XX/AR724X/AR913X SoCs

This patch adds a driver for the built-in hardware watchdog device
of the Atheros AR71XX/AR724X/AR913X SoCs.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index db00fa9..68a9527 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -866,6 +866,13 @@
 
 # MIPS Architecture
 
+config ATH79_WDT
+	tristate "Atheros AR71XX/AR724X/AR913X hardware watchdog"
+	depends on ATH79
+	help
+	  Hardware driver for the built-in watchdog timer on the Atheros
+	  AR71XX/AR724X/AR913X SoCs.
+
 config BCM47XX_WDT
 	tristate "Broadcom BCM47xx Watchdog Timer"
 	depends on BCM47XX