1Bindings for a fan connected to the PWM lines
2
3Required properties:
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
8
9Optional properties:
10- fan-supply		: phandle to the regulator that provides power to the fan
11- interrupts		: This contains a single interrupt specifier which
12			  describes the tachometer output of the fan as an
13			  interrupt source. The output signal must generate a
14			  defined number of interrupts per fan revolution, which
15			  require that it must be self resetting edge interrupts.
16			  See interrupt-controller/interrupts.txt for the format.
17- pulses-per-revolution : define the tachometer pulses per fan revolution as
18			  an integer (default is 2 interrupts per revolution).
19			  The value must be greater than zero.
20
21Example:
22	fan0: pwm-fan {
23		compatible = "pwm-fan";
24		#cooling-cells = <2>;
25		pwms = <&pwm 0 10000 0>;
26		cooling-levels = <0 102 170 230>;
27	};
28
29	thermal-zones {
30		cpu_thermal: cpu-thermal {
31			     thermal-sensors = <&tmu 0>;
32			     polling-delay-passive = <0>;
33			     polling-delay = <0>;
34			     trips {
35					cpu_alert1: cpu-alert1 {
36						    temperature = <100000>; /* millicelsius */
37						    hysteresis = <2000>; /* millicelsius */
38						    type = "passive";
39					};
40			     };
41			     cooling-maps {
42					map0 {
43						    trip = <&cpu_alert1>;
44						    cooling-device = <&fan0 0 1>;
45					};
46			     };
47		};
48
49Example 2:
50	fan0: pwm-fan {
51		compatible = "pwm-fan";
52		pwms = <&pwm 0 40000 0>;
53		fan-supply = <&reg_fan>;
54		interrupt-parent = <&gpio5>;
55		interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
56		pulses-per-revolution = <2>;
57	};
58