watchdog: Add MAX6370 watchdog timer driver

MAX6370 watchdog is available e.g. on Freescale P1/P2 RDB-PC boards.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 03e8e72..c3eb8a8 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -168,6 +168,13 @@
 	  doc/device-tree-bindings/watchdog/gpio-wdt.txt for
 	  information on how to describe the watchdog in device tree.
 
+config WDT_MAX6370
+	bool "MAX6370 watchdog timer support"
+	depends on WDT
+	select DM_GPIO
+	help
+	  Select this to enable max6370 watchdog timer.
+
 config WDT_MPC8xx
 	bool "MPC8xx watchdog timer support"
 	depends on WDT && MPC8xx