linux/Documentation/devicetree/bindings/pwm/atmel-tcb-pwm.txt
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   1Atmel TCB PWM controller
   2
   3Required properties:
   4- compatible: should be "atmel,tcb-pwm"
   5- #pwm-cells: Should be 3.  The first cell specifies the per-chip index
   6  of the PWM to use, the second cell is the period in nanoseconds and
   7  bit 0 in the third cell is used to encode the polarity of PWM output.
   8  Set bit 0 of the third cell in PWM specifier to 1 for inverse polarity &
   9  set to 0 for normal polarity.
  10- tc-block: The Timer Counter block to use as a PWM chip.
  11
  12Example:
  13
  14pwm {
  15        compatible = "atmel,tcb-pwm";
  16        #pwm-cells = <3>;
  17        tc-block = <1>;
  18};
  19