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diff --git a/Documentation/devicetree/bindings/sound/sirf-usp.txt b/Documentation/devicetree/bindings/sound/sirf-usp.txt
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+* SiRF SoC USP module
+
+Required properties:
+- compatible: "sirf,prima2-usp-pcm"
+- reg: Base address and size entries:
+- dmas: List of DMA controller phandle and DMA request line ordered pairs.
+- dma-names: Identifier string for each DMA request line in the dmas property.
+  These strings correspond 1:1 with the ordered pairs in dmas.
+
+  One of the DMA channels will be responsible for transmission (should be
+  named "tx") and one for reception (should be named "rx").
+
+- clocks: USP controller clock source
+- pinctrl-names: Must contain a "default" entry.
+- pinctrl-NNN: One property must exist for each entry in pinctrl-names.
+
+Example:
+usp0: usp@b0080000 {
+        compatible = "sirf,prima2-usp-pcm";
+        reg = <0xb0080000 0x10000>;
+        clocks = <&clks 28>;
+        dmas = <&dmac1 1>, <&dmac1 2>;
+        dma-names = "rx", "tx";
+        pinctrl-names = "default";
+        pinctrl-0 = <&usp0_only_utfs_pins_a>;
+};
+