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diff --git a/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.txt
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+* Allwinner GMAC ethernet controller
+
+This device is a platform glue layer for stmmac.
+Please see stmmac.txt for the other unchanged properties.
+
+Required properties:
+ - compatible:  Should be "allwinner,sun7i-a20-gmac"
+ - clocks: Should contain the GMAC main clock, and tx clock
+   The tx clock type should be "allwinner,sun7i-a20-gmac-clk"
+ - clock-names: Should contain the clock names "stmmaceth",
+   and "allwinner_gmac_tx"
+
+Optional properties:
+- phy-supply: phandle to a regulator if the PHY needs one
+
+Examples:
+
+        gmac: ethernet@01c50000 {
+                compatible = "allwinner,sun7i-a20-gmac";
+                reg = <0x01c50000 0x10000>,
+                      <0x01c20164 0x4>;
+                interrupts = <0 85 1>;
+                interrupt-names = "macirq";
+                clocks = <&ahb_gates 49>, <&gmac_tx>;
+                clock-names = "stmmaceth", "allwinner_gmac_tx";
+                phy-mode = "mii";
+        };