linux/Documentation/devicetree/bindings/pwm/pwm-tipwmss.txt
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   1TI SOC based PWM Subsystem
   2
   3Required properties:
   4- compatible: Must be "ti,am33xx-pwmss";
   5- reg: physical base address and size of the registers map.
   6- address-cells: Specify the number of u32 entries needed in child nodes.
   7                  Should set to 1.
   8- size-cells: specify number of u32 entries needed to specify child nodes size
   9                in reg property. Should set to 1.
  10- ranges: describes the address mapping of a memory-mapped bus. Should set to
  11           physical address map of child's base address, physical address within
  12           parent's address  space and length of the address map. For am33xx,
  13           3 set of child register maps present, ECAP register space, EQEP
  14           register space, EHRPWM register space.
  15
  16Also child nodes should also populated under PWMSS DT node.
  17
  18Example:
  19pwmss0: pwmss@48300000 {
  20        compatible = "ti,am33xx-pwmss";
  21        reg = <0x48300000 0x10>;
  22        ti,hwmods = "epwmss0";
  23        #address-cells = <1>;
  24        #size-cells = <1>;
  25        status = "disabled";
  26        ranges = <0x48300100 0x48300100 0x80   /* ECAP */
  27                  0x48300180 0x48300180 0x80   /* EQEP */
  28                  0x48300200 0x48300200 0x80>; /* EHRPWM */
  29
  30        /* child nodes go here */
  31};
  32