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TI SOC ECAP based APWM controller

Required properties:
- compatible: Must be "ti,<soc>-ecap".
  for am33xx  - compatible = "ti,am33xx-ecap";
  for am4372  - compatible = "ti,am4372-ecap", "ti,am33xx-ecap";
  for da850   - compatible = "ti,da850-ecap", "ti,am33xx-ecap";
- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
  the cells format. The PWM channel index ranges from 0 to 4. The only third
  cell flag supported by this binding is PWM_POLARITY_INVERTED.
- reg: physical base address and size of the registers map.

Optional properties:
- ti,hwmods: Name of the hwmod associated to the ECAP:
  "ecap<x>", <x> being the 0-based instance number from the HW spec

Example:

ecap0: ecap@48300100 { /* ECAP on am33xx */
	compatible = "ti,am33xx-ecap";
	#pwm-cells = <3>;
	reg = <0x48300100 0x80>;
	ti,hwmods = "ecap0";
};

ecap0: ecap@48300100 { /* ECAP on am4372 */
	compatible = "ti,am4372-ecap", "ti,am33xx-ecap";
	#pwm-cells = <3>;
	reg = <0x48300100 0x80>;
	ti,hwmods = "ecap0";
};

ecap0: ecap@1f06000 { /* ECAP on da850 */
	compatible = "ti,da850-ecap", "ti,am33xx-ecap";
	#pwm-cells = <3>;
	reg = <0x1f06000 0x80>;
};