Documentation/devicetree/bindings/gpio/gpio-fan.txt

   1 Bindings for fan connected to GPIO lines
   2
   3 Required properties:
   4 - compatible : "gpio-fan"
   5 - gpios: Specifies the pins that map to bits in the control value,
   6   ordered MSB-->LSB.
   7 - gpio-fan,speed-map: A mapping of possible fan RPM speeds and the
   8   control value that should be set to achieve them. This array
   9   must have the RPM values in ascending order.
  10
  11 Optional properties:
  12 - alarm-gpios: This pin going active indicates something is wrong with
  13   the fan, and a udev event will be fired.
  14
  15 Examples:
  16
  17         gpio_fan {
  18                 compatible = "gpio-fan";
  19                 gpios = <&gpio1 14 1
  20                          &gpio1 13 1>;
  21                 gpio-fan,speed-map = <0    0
  22                                       3000 1
  23                                       6000 2>;
  24                 alarm-gpios = <&gpio1 15 1>;
  25         };