tjh.dev
Linux kernel mirror (for testing)
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linux
1STMicroelectronics PWM driver bindings
2--------------------------------------
3
4Required parameters:
5- compatible : "st,pwm"
6- #pwm-cells : Number of cells used to specify a PWM. First cell
7 specifies the per-chip index of the PWM to use and the
8 second cell is the period in nanoseconds - fixed to 2
9 for STiH41x.
10- reg : Physical base address and length of the controller's
11 registers.
12- pinctrl-names: Set to "default".
13- pinctrl-0: List of phandles pointing to pin configuration nodes
14 for PWM module.
15 For Pinctrl properties, please refer to [1].
16- clock-names: Set to "pwm".
17- clocks: phandle of the clock used by the PWM module.
18 For Clk properties, please refer to [2].
19
20Optional properties:
21- st,pwm-num-chan: Number of available channels. If not passed, the driver
22 will consider single channel by default.
23
24[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
25[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
26
27Example:
28
29pwm1: pwm@fe510000 {
30 compatible = "st,pwm";
31 reg = <0xfe510000 0x68>;
32 #pwm-cells = <2>;
33 pinctrl-names = "default";
34 pinctrl-0 = <&pinctrl_pwm1_chan0_default
35 &pinctrl_pwm1_chan1_default
36 &pinctrl_pwm1_chan2_default
37 &pinctrl_pwm1_chan3_default>;
38 clocks = <&clk_sysin>;
39 clock-names = "pwm";
40 st,pwm-num-chan = <4>;
41};