dm: watchdog: add BCM6345 watchdog driver

This driver is a simplified version of linux/drivers/watchdog/bcm63xx_wdt.c

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 22a7c4f..b911233 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -54,4 +54,12 @@
 	  It currently does not support Boot Flash Addressing Mode Detection or
 	  Second Boot.
 
+config WDT_BCM6345
+	bool "BCM6345 watchdog timer support"
+	depends on WDT && ARCH_BMIPS
+	help
+	  Select this to enable watchdog timer for BCM6345 SoCs.
+	  The watchdog timer is stopped when initialized.
+	  It performs full SoC reset.
+
 endmenu