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
22 	fan0: pwm-fan {
23 		compatible = "pwm-fan";
24 		#cooling-cells = <2>;
26 		cooling-levels = <0 102 170 230>;
29 	thermal-zones {
30 		cpu_thermal: cpu-thermal {
31 			     thermal-sensors = <&tmu 0>;
32 			     polling-delay-passive = <0>;
33 			     polling-delay = <0>;
35 					cpu_alert1: cpu-alert1 {
41 			     cooling-maps {
44 						    cooling-device = <&fan0 0 1>;
50 	fan0: pwm-fan {
51 		compatible = "pwm-fan";
53 		fan-supply = <&reg_fan>;
54 		interrupt-parent = <&gpio5>;
56 		pulses-per-revolution = <2>;