bindings/hwmon/pwm-fan.txt

4 - compatible	: "pwm-fan"
5 - pwms		: the PWM that is used to control the PWM fan
6 - cooling-levels      : PWM duty cycle values in a range from 0 to 255
7 			which correspond to thermal cooling states
10 - fan-supply		: phandle to the regulator that provides power to the fan
11 - interrupts		: This contains a single interrupt specifier which
16 			  See interrupt-controller/interrupts.txt for the format.
17 - pulses-per-revolution : define the tachometer pulses per fan revolution as
20 - rockchip,temp-trips	: The property is an array of 2-tuples items, and
22 			  pwm cooling state. This depends on CONFIG_ROCKCHIP_SYSTEM_MONITOR.
23 			  If add the property the fan cooling state will be changed
27 	fan0: pwm-fan {
28 		compatible = "pwm-fan";
29 		#cooling-cells = <2>;
31 		cooling-levels = <0 102 170 230>;
34 	thermal-zones {
35 		cpu_thermal: cpu-thermal {
36 			     thermal-sensors = <&tmu 0>;
37 			     polling-delay-passive = <0>;
38 			     polling-delay = <0>;
40 					cpu_alert1: cpu-alert1 {
46 			     cooling-maps {
49 						    cooling-device = <&fan0 0 1>;
55 	fan0: pwm-fan {
56 		compatible = "pwm-fan";
58 		fan-supply = <&reg_fan>;
59 		interrupt-parent = <&gpio5>;
61 		pulses-per-revolution = <2>;