watchdog: NXP LPC18xx Watchdog Timer Driver

This commit adds support for the watchdog timer found in NXP LPC SoCs
family, which includes LPC18xx/LPC43xx. Other SoCs in that family may
share the same watchdog hardware.

Watchdog driver registers a restart handler that will restart the system
by performing an incorrect feed after ensuring the watchdog is enabled in
reset mode.

As watchdog cannot be disabled in hardware, driver's stop routine will
regularly send a keepalive ping using a timer.

Signed-off-by: Ariel D'Alessandro <ariel@vanguardiasur.com.ar>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 241fafde42cb..b69bd67eea96 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -558,6 +558,17 @@ config DIGICOLOR_WATCHDOG
           To compile this driver as a module, choose M here: the
           module will be called digicolor_wdt.
 
+config LPC18XX_WATCHDOG
+        tristate "LPC18xx/43xx Watchdog"
+        depends on ARCH_LPC18XX || COMPILE_TEST
+        select WATCHDOG_CORE
+        help
+          Say Y here if to include support for the watchdog timer
+          in NXP LPC SoCs family, which includes LPC18xx/LPC43xx
+          processors.
+          To compile this driver as a module, choose M here: the
+          module will be called lpc18xx_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT