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 Example:
  10         fan0: pwm-fan {
  11                 compatible = "pwm-fan";
  12                 cooling-min-state = <0>;
  13                 cooling-max-state = <3>;
  14                 #cooling-cells = <2>;
  15                 pwms = <&pwm 0 10000 0>;
  16                 cooling-levels = <0 102 170 230>;
  17         };
  18
  19         thermal-zones {
  20                 cpu_thermal: cpu-thermal {
  21                              thermal-sensors = <&tmu 0>;
  22                              polling-delay-passive = <0>;
  23                              polling-delay = <0>;
  24                              trips {
  25                                         cpu_alert1: cpu-alert1 {
  26                                                     temperature = <100000>; /* millicelsius */
  27                                                     hysteresis = <2000>; /* millicelsius */
  28                                                     type = "passive";
  29                                         };
  30                              };
  31                              cooling-maps {
  32                                         map0 {
  33                                                     trip = <&cpu_alert1>;
  34                                                     cooling-device = <&fan0 0 1>;
  35                                         };
  36                              };
  37                 };