[deliverable/linux.git] / Documentation / devicetree / bindings / pwm / pwm-bcm2835.txt

BCM2835 PWM controller (Raspberry Pi controller)

Required properties:
- compatible: should be "brcm,bcm2835-pwm"
- reg: physical base address and length of the controller's registers
- clock: This clock defines the base clock frequency of the PWM hardware
  system, the period and the duty_cycle of the PWM signal is a multiple of
  the base period.
- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
  the cells format.

Examples:

pwm@2020c000 {
	compatible = "brcm,bcm2835-pwm";
	reg = <0x2020c000 0x28>;
	clocks = <&clk_pwm>;
	#pwm-cells = <2>;
};

clocks {
	....
		clk_pwm: pwm {
			compatible = "fixed-clock";
			reg = <3>;
			#clock-cells = <0>;
			clock-frequency = <9200000>;
		};
	....
};
Commit	Line	Data
e5a06dc5 BT	1	BCM2835 PWM controller (Raspberry Pi controller)
	2
	3	Required properties:
	4	- compatible: should be "brcm,bcm2835-pwm"
	5	- reg: physical base address and length of the controller's registers
	6	- clock: This clock defines the base clock frequency of the PWM hardware
	7	system, the period and the duty_cycle of the PWM signal is a multiple of
	8	the base period.
	9	- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
	10	the cells format.
	11
	12	Examples:
	13
	14	pwm@2020c000 {
	15	compatible = "brcm,bcm2835-pwm";
	16	reg = <0x2020c000 0x28>;
	17	clocks = <&clk_pwm>;
	18	#pwm-cells = <2>;
	19	};
	20
	21	clocks {
	22	....
	23	clk_pwm: pwm {
	24	compatible = "fixed-clock";
	25	reg = <3>;
	26	#clock-cells = <0>;
	27	clock-frequency = <9200000>;
	28	};
	29	....
	30	};