Kernel-3.10.0-957.el7_gpio-fan

Bindings for fan connected to GPIO lines

Required properties:

• compatible : “gpio-fan”
• gpios: Specifies the pins that map to bits in the control value,
  ordered MSB–>LSB.
• gpio-fan,speed-map: A mapping of possible fan RPM speeds and the
  control value that should be set to achieve them. This array
  must have the RPM values in ascending order.

Optional properties:

• alarm-gpios: This pin going active indicates something is wrong with
  the fan, and a udev event will be fired.

Examples:

gpio_fan {
    compatible = "gpio-fan";
    gpios = <&gpio1 14 1
         &gpio1 13 1>;
    gpio-fan,speed-map = <0    0
                  3000 1
                  6000 2>;
    alarm-gpios = <&gpio1 15 1>;
};