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diff --git a/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt b/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt
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+++ b/Documentation/devicetree/bindings/watchdog/sun4i-wdt.txt
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+Allwinner sun4i Watchdog timer
+
+Required properties:
+
+- compatible : should be "allwinner,sun4i-wdt"
+- reg : Specifies base physical address and size of the registers.
+
+Example:
+
+wdt: watchdog@01c20c90 {
+        compatible = "allwinner,sun4i-wdt";
+        reg = <0x01c20c90 0x10>;
+};