[WATCHDOG] add Nano 7240 driver

Adds support for the built-in watchdog on EPIC Nano 7240 boards from IEI.

Tested on Nano-7240RS.

Hardware documentation of the platform (including watchdog) can be found
on the IEI website: http://www.ieiworld.com

Signed-off-by: Gilles Gigan <gilles.gigan@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 126b554..52dff40 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -466,6 +466,19 @@
 
 	  Most people will say N.
 
+config SBC7240_WDT
+	tristate "SBC Nano 7240 Watchdog Timer"
+	depends on X86_32
+	---help---
+	  This is the driver for the hardware watchdog found on the IEI
+	  single board computers EPIC Nano 7240 (and likely others). This
+	  watchdog simply watches your kernel to make sure it doesn't freeze,
+	  and if it does, it reboots your computer after a certain amount of
+	  time.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sbc7240_wdt.
+
 config CPU5_WDT
 	tristate "SMA CPU5 Watchdog"
 	depends on X86