linux/Documentation/devicetree/bindings/pwm/mxs-pwm.txt
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   1Freescale MXS PWM controller
   2
   3Required properties:
   4- compatible: should be "fsl,imx23-pwm"
   5- reg: physical base address and length of the controller's registers
   6- #pwm-cells: should be 2.  The first cell specifies the per-chip index
   7  of the PWM to use and the second cell is the period in nanoseconds.
   8- fsl,pwm-number: the number of PWM devices
   9
  10Example:
  11
  12pwm: pwm@80064000 {
  13        compatible = "fsl,imx28-pwm", "fsl,imx23-pwm";
  14        reg = <0x80064000 0x2000>;
  15        #pwm-cells = <2>;
  16        fsl,pwm-number = <8>;
  17};
  18