linux/Documentation/devicetree/bindings/pwm/vt8500-pwm.txt
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   1VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller
   2
   3Required properties:
   4- compatible: should be "via,vt8500-pwm"
   5- reg: physical base address and length of the controller's registers
   6- #pwm-cells: Should be 3. Number of cells being used to specify PWM property.
   7  First cell specifies the per-chip index of the PWM to use, the second
   8  cell is the period in nanoseconds and bit 0 in the third cell is used to
   9  encode the polarity of PWM output. Set bit 0 of the third in PWM specifier
  10  to 1 for inverse polarity & set to 0 for normal polarity.
  11- clocks: phandle to the PWM source clock
  12
  13Example:
  14
  15pwm1: pwm@d8220000 {
  16        #pwm-cells = <3>;
  17        compatible = "via,vt8500-pwm";
  18        reg = <0xd8220000 0x1000>;
  19        clocks = <&clkpwm>;
  20};
  21