Documentation/devicetree/bindings/clock/pwm-clock.txt

   1 Binding for an external clock signal driven by a PWM pin.
   2
   3 This binding uses the common clock binding[1] and the common PWM binding[2].
   4
   5 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
   6 [2] Documentation/devicetree/bindings/pwm/pwm.txt
   7
   8 Required properties:
   9 - compatible : shall be "pwm-clock".
  10 - #clock-cells : from common clock binding; shall be set to 0.
  11 - pwms : from common PWM binding; this determines the clock frequency
  12   via the period given in the PWM specifier.
  13
  14 Optional properties:
  15 - clock-output-names : From common clock binding.
  16 - clock-frequency : Exact output frequency, in case the PWM period
  17   is not exact but was rounded to nanoseconds.
  18
  19 Example:
  20         clock {
  21                 compatible = "pwm-clock";
  22                 #clock-cells = <0>;
  23                 clock-frequency = <25000000>;
  24                 clock-output-names = "mipi_mclk";
  25                 pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 MHz */
  26         };