Documentation/devicetree/bindings/hwmon/pwm-fan.txt

   1 Bindings for a fan connected to the PWM lines
   2
   3 Required 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
   9 Optional properties:
  10 - fan-supply    : phandle to the regulator that provides power to the fan
  11
  12 Example:
  13         fan0: pwm-fan {
  14                 compatible = "pwm-fan";
  15                 cooling-min-state = <0>;
  16                 cooling-max-state = <3>;
  17                 #cooling-cells = <2>;
  18                 pwms = <&pwm 0 10000 0>;
  19                 cooling-levels = <0 102 170 230>;
  20         };
  21
  22         thermal-zones {
  23                 cpu_thermal: cpu-thermal {
  24                              thermal-sensors = <&tmu 0>;
  25                              polling-delay-passive = <0>;
  26                              polling-delay = <0>;
  27                              trips {
  28                                         cpu_alert1: cpu-alert1 {
  29                                                     temperature = <100000>; /* millicelsius */
  30                                                     hysteresis = <2000>; /* millicelsius */
  31                                                     type = "passive";
  32                                         };
  33                              };
  34                              cooling-maps {
  35                                         map0 {
  36                                                     trip = <&cpu_alert1>;
  37                                                     cooling-device = <&fan0 0 1>;
  38                                         };
  39                              };
  40                 };