dt-bindings: rng: Describe Exynos4 PRNG bindings

Document the bindings used by exynos-rng Pseudo Random Number Generator
driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/Documentation/devicetree/bindings/rng/samsung,exynos-rng4.txt b/Documentation/devicetree/bindings/rng/samsung,exynos-rng4.txt
new file mode 100644 (file)
index 0000000..4ca8dd4
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/samsung,exynos-rng4.txt
@@ -0,0 +1,17 @@
+Exynos Pseudo Random Number Generator
+
+Required properties:
+
+- compatible  : Should be "samsung,exynos4-rng".
+- reg         : Specifies base physical address and size of the registers map.
+- clocks      : Phandle to clock-controller plus clock-specifier pair.
+- clock-names : "secss" as a clock name.
+
+Example:
+
+       rng@10830400 {
+               compatible = "samsung,exynos4-rng";
+               reg = <0x10830400 0x200>;
+               clocks = <&clock CLK_SSS>;
+               clock-names = "secss";
+       };