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diff --git a/Documentation/powerpc/dts-bindings/gpio/mdio.txt b/Documentation/powerpc/dts-bindings/gpio/mdio.txt
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+++ b/Documentation/powerpc/dts-bindings/gpio/mdio.txt
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+MDIO on GPIOs
+
+Currently defined compatibles:
+- virtual,gpio-mdio
+
+MDC and MDIO lines connected to GPIO controllers are listed in the
+gpios property as described in section VIII.1 in the following order:
+
+MDC, MDIO.
+
+Example:
+
+mdio {
+        compatible = "virtual,mdio-gpio";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        gpios = <&qe_pio_a 11
+                 &qe_pio_c 6>;
+};