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diff --git a/Documentation/devicetree/bindings/rng/imx-rng.txt b/Documentation/devicetree/bindings/rng/imx-rng.txt
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+Freescale RNGA/RNGB/RNGC (Random Number Generator Versions A, B and C)
+
+Required properties:
+- compatible : should be one of
+               "fsl,imx21-rnga"
+               "fsl,imx31-rnga" (backward compatible with "fsl,imx21-rnga")
+               "fsl,imx25-rngb"
+               "fsl,imx35-rngc"
+- reg : offset and length of the register set of this block
+- interrupts : the interrupt number for the RNG block
+- clocks : the RNG clk source
+
+Example:
+
+rng@53fb0000 {
+	compatible = "fsl,imx25-rngb";
+	reg = <0x53fb0000 0x4000>;
+	interrupts = <22>;
+	clocks = <&trng_clk>;
+};