1 Bindings for fan connected to GPIO lines
4 - compatible : "gpio-fan"
7 - gpios: Specifies the pins that map to bits in the control value,
9 - gpio-fan,speed-map: A mapping of possible fan RPM speeds and the
10 control value that should be set to achieve them. This array
11 must have the RPM values in ascending order.
12 - alarm-gpios: This pin going active indicates something is wrong with
13 the fan, and a udev event will be fired.
15 Note: At least one the "gpios" or "alarm-gpios" properties must be set.
20 compatible = "gpio-fan";
23 gpio-fan,speed-map = <0 0
26 alarm-gpios = <&gpio1 15 1>;