xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/clock/pwm-clock.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593SmuzhiyunBinding for an external clock signal driven by a PWM pin.
2*4882a593Smuzhiyun
3*4882a593SmuzhiyunThis binding uses the common clock binding[1] and the common PWM binding[2].
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
6*4882a593Smuzhiyun[2] Documentation/devicetree/bindings/pwm/pwm.txt
7*4882a593Smuzhiyun
8*4882a593SmuzhiyunRequired properties:
9*4882a593Smuzhiyun- compatible : shall be "pwm-clock".
10*4882a593Smuzhiyun- #clock-cells : from common clock binding; shall be set to 0.
11*4882a593Smuzhiyun- pwms : from common PWM binding; this determines the clock frequency
12*4882a593Smuzhiyun  via the period given in the PWM specifier.
13*4882a593Smuzhiyun
14*4882a593SmuzhiyunOptional properties:
15*4882a593Smuzhiyun- clock-output-names : From common clock binding.
16*4882a593Smuzhiyun- clock-frequency : Exact output frequency, in case the PWM period
17*4882a593Smuzhiyun  is not exact but was rounded to nanoseconds.
18*4882a593Smuzhiyun
19*4882a593SmuzhiyunExample:
20*4882a593Smuzhiyun	clock {
21*4882a593Smuzhiyun		compatible = "pwm-clock";
22*4882a593Smuzhiyun		#clock-cells = <0>;
23*4882a593Smuzhiyun		clock-frequency = <25000000>;
24*4882a593Smuzhiyun		clock-output-names = "mipi_mclk";
25*4882a593Smuzhiyun		pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 MHz */
26*4882a593Smuzhiyun	};
27