--- zzzz-none-000/linux-3.10.107/Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt	2021-02-04 17:41:59.000000000 +0000
@@ -5,9 +5,14 @@
 - compatible : should be "brcm,bcm2835-pm-wdt"
 - reg : Specifies base physical address and size of the registers.
 
+Optional properties:
+
+- timeout-sec   : Contains the watchdog timeout in seconds
+
 Example:
 
 watchdog {
 	compatible = "brcm,bcm2835-pm-wdt";
 	reg = <0x7e100000 0x28>;
+	timeout-sec = <10>;
 };