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diff --git a/Documentation/devicetree/bindings/sound/ak5558.txt b/Documentation/devicetree/bindings/sound/ak5558.txt
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+AK5558 audio ADC
+
+This device supports I2C mode only.
+
+Required properties:
+
+- compatible : "asahi-kasei,ak5558"
+- reg : The I2C address of the device for I2C.
+- asahi-kasei,pdn-gpios: A GPIO specifier for the GPIO controlling
+	the power down & reset pin.
+
+Example:
+
+&i2c {
+	ak5558: ak5558@10 {
+		compatible = "asahi-kasei,ak5558";
+		reg = <0x10>;
+		asahi-kasei,pdn-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+	};
+};