xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593SmuzhiyunBCM2835 PWM controller (Raspberry Pi controller)
2*4882a593Smuzhiyun
3*4882a593SmuzhiyunRequired properties:
4*4882a593Smuzhiyun- compatible: should be "brcm,bcm2835-pwm"
5*4882a593Smuzhiyun- reg: physical base address and length of the controller's registers
6*4882a593Smuzhiyun- clocks: This clock defines the base clock frequency of the PWM hardware
7*4882a593Smuzhiyun  system, the period and the duty_cycle of the PWM signal is a multiple of
8*4882a593Smuzhiyun  the base period.
9*4882a593Smuzhiyun- #pwm-cells: Should be 3. See pwm.yaml in this directory for a description of
10*4882a593Smuzhiyun  the cells format.
11*4882a593Smuzhiyun
12*4882a593SmuzhiyunExamples:
13*4882a593Smuzhiyun
14*4882a593Smuzhiyunpwm@2020c000 {
15*4882a593Smuzhiyun	compatible = "brcm,bcm2835-pwm";
16*4882a593Smuzhiyun	reg = <0x2020c000 0x28>;
17*4882a593Smuzhiyun	clocks = <&clk_pwm>;
18*4882a593Smuzhiyun	#pwm-cells = <3>;
19*4882a593Smuzhiyun};
20*4882a593Smuzhiyun
21*4882a593Smuzhiyunclocks {
22*4882a593Smuzhiyun	....
23*4882a593Smuzhiyun		clk_pwm: pwm {
24*4882a593Smuzhiyun			compatible = "fixed-clock";
25*4882a593Smuzhiyun			reg = <3>;
26*4882a593Smuzhiyun			#clock-cells = <0>;
27*4882a593Smuzhiyun			clock-frequency = <9200000>;
28*4882a593Smuzhiyun		};
29*4882a593Smuzhiyun	....
30*4882a593Smuzhiyun};
31