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diff --git a/Documentation/devicetree/bindings/sound/ak4104.txt b/Documentation/devicetree/bindings/sound/ak4104.txt
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+AK4104 S/PDIF transmitter
+
+This device supports SPI mode only.
+
+Required properties:
+
+  - compatible : "asahi-kasei,ak4104"
+
+  - reg : The chip select number on the SPI bus
+
+Example:
+
+spdif: ak4104@0 {
+        compatible = "asahi-kasei,ak4104";
+        reg = <0>;
+        spi-max-frequency = <5000000>;
+};