Documentation: rng: Add X-Gene SoC RNG driver documentation

Add X-Gene SoC RNG driver documentation.

Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/rng/apm,rng.txt b/Documentation/devicetree/bindings/rng/apm,rng.txt
new file mode 100644 (file)
index 0000000..4dde4b0
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+++ b/Documentation/devicetree/bindings/rng/apm,rng.txt
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+APM X-Gene SoC random number generator.
+
+Required properties:
+
+- compatible  : should be "apm,xgene-rng"
+- reg         : specifies base physical address and size of the registers map
+- clocks      : phandle to clock-controller plus clock-specifier pair
+- interrupts  : specify the fault interrupt for the RNG device
+
+Example:
+
+       rng: rng@10520000 {
+               compatible = "apm,xgene-rng";
+               reg = <0x0 0x10520000 0x0 0x100>;
+               interrupts =   <0x0 0x41 0x4>;
+               clocks = <&rngpkaclk 0>;
+       };