dt/bindings: Add bindings for the PIC32 random number generator

Document the devicetree bindings for the random number generator found
on Microchip PIC32 class devices.

Signed-off-by: Joshua Henderson <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

diff --git a/Documentation/devicetree/bindings/rng/microchip,pic32-rng.txt b/Documentation/devicetree/bindings/rng/microchip,pic32-rng.txt
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+* Microchip PIC32 Random Number Generator
+
+The PIC32 RNG provides a pseudo random number generator which can be seeded by
+another true random number generator.
+
+Required properties:
+- compatible : should be "microchip,pic32mzda-rng"
+- reg : Specifies base physical address and size of the registers.
+- clocks: clock phandle.
+
+Example:
+
+       rng: rng@1f8e6000 {
+               compatible = "microchip,pic32mzda-rng";
+               reg = <0x1f8e6000 0x1000>;
+               clocks = <&PBCLK5>;
+       };