Ingenic JZ47xx PWM Controller
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Required properties:
- compatible: Should be "ingenic,jz4740-pwm"
- #pwm-cells: Should be 3. See pwm.txt in this directory for a description
  of the cells format.
- clocks : phandle to the external clock.
- clock-names : Should be "ext".


Example:

	pwm: pwm@10002000 {
		compatible = "ingenic,jz4740-pwm";
		reg = <0x10002000 0x1000>;

		#pwm-cells = <3>;

		clocks = <&ext>;
		clock-names = "ext";
	};