linux/Documentation/devicetree/bindings/hwrng/timeriomem_rng.txt
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   1HWRNG support for the timeriomem_rng driver
   2
   3Required properties:
   4- compatible : "timeriomem_rng"
   5- reg : base address to sample from
   6- period : wait time in microseconds to use between samples
   7
   8N.B. currently 'reg' must be four bytes wide and aligned
   9
  10Example:
  11
  12hwrng@44 {
  13        #address-cells = <1>;
  14        #size-cells = <1>;
  15        compatible = "timeriomem_rng";
  16        reg = <0x44 0x04>;
  17        period = <1000000>;
  18};
  19