linux/Documentation/devicetree/bindings/clock/fixed-clock.txt
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   1Binding for simple fixed-rate clock sources.
   2
   3This binding uses the common clock binding[1].
   4
   5[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
   6
   7Required properties:
   8- compatible : shall be "fixed-clock".
   9- #clock-cells : from common clock binding; shall be set to 0.
  10- clock-frequency : frequency of clock in Hz. Should be a single cell.
  11
  12Optional properties:
  13- gpios : From common gpio binding; gpio connection to clock enable pin.
  14- clock-output-names : From common clock binding.
  15
  16Example:
  17        clock {
  18                compatible = "fixed-clock";
  19                #clock-cells = <0>;
  20                clock-frequency = <1000000000>;
  21        };
  22