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-rw-r--r--dts/Bindings/gpio/gpio-fan.txt19
1 files changed, 17 insertions, 2 deletions
diff --git a/dts/Bindings/gpio/gpio-fan.txt b/dts/Bindings/gpio/gpio-fan.txt
index 2dd457a346..439a7430fc 100644
--- a/dts/Bindings/gpio/gpio-fan.txt
+++ b/dts/Bindings/gpio/gpio-fan.txt
@@ -2,15 +2,20 @@ Bindings for fan connected to GPIO lines
Required properties:
- compatible : "gpio-fan"
+
+Optional properties:
- 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.
+- cooling-cells: If used as a cooling device, must be <2>
+ Also see: Documentation/devicetree/bindings/thermal/thermal.txt
+ min and max states are derived from the speed-map of the fan.
+
+Note: At least one the "gpios" or "alarm-gpios" properties must be set.
Examples:
@@ -23,3 +28,13 @@ Examples:
6000 2>;
alarm-gpios = <&gpio1 15 1>;
};
+ gpio_fan_cool: gpio_fan {
+ compatible = "gpio-fan";
+ gpios = <&gpio2 14 1
+ &gpio2 13 1>;
+ gpio-fan,speed-map = <0 0>,
+ <3000 1>,
+ <6000 2>;
+ alarm-gpios = <&gpio2 15 1>;
+ #cooling-cells = <2>; /* min followed by max */
+ };