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b5cf88e46b
Allow gpio-fan to be used as thermal cooling device for platforms that use GPIO maps to control fans. As part of this change, we make the shutdown and remove logic the same as well. Signed-off-by: Nishanth Menon <nm@ti.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
41 lines
1.2 KiB
Plaintext
41 lines
1.2 KiB
Plaintext
Bindings for fan connected to GPIO lines
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Required properties:
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- compatible : "gpio-fan"
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Optional properties:
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- gpios: Specifies the pins that map to bits in the control value,
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ordered MSB-->LSB.
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- gpio-fan,speed-map: A mapping of possible fan RPM speeds and the
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control value that should be set to achieve them. This array
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must have the RPM values in ascending order.
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- alarm-gpios: This pin going active indicates something is wrong with
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the fan, and a udev event will be fired.
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- cooling-cells: If used as a cooling device, must be <2>
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Also see: Documentation/devicetree/bindings/thermal/thermal.txt
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min and max states are derived from the speed-map of the fan.
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Note: At least one the "gpios" or "alarm-gpios" properties must be set.
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Examples:
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gpio_fan {
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compatible = "gpio-fan";
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gpios = <&gpio1 14 1
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&gpio1 13 1>;
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gpio-fan,speed-map = <0 0
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3000 1
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6000 2>;
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alarm-gpios = <&gpio1 15 1>;
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};
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gpio_fan_cool: gpio_fan {
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compatible = "gpio-fan";
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gpios = <&gpio2 14 1
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&gpio2 13 1>;
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gpio-fan,speed-map = <0 0>,
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<3000 1>,
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<6000 2>;
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alarm-gpios = <&gpio2 15 1>;
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#cooling-cells = <2>; /* min followed by max */
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};
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