Re: [PATCH v2 3/8] hwmon: dts: Doc: Add DTS doc to explain how to use PWM FAN as a cooling device

Eduardo Valentin
2015-01-02T18:51:22Z

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On Mon, Dec 22, 2014 at 05:27:43PM +0100, Lukasz Majewski wrote:
> Several new properties to allow PWM fan working as a cooling device have been
> combined into this single commit.
>

Patch prefix should look something like 'dt-bindings: ...', or better
'Documentation: devicetree: ...', or 'Documentation: bindings: ...'

> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> ---
> Changes for v2:
> - Rename cooling-pwm-values to cooling-levels
> - Remove default-pulse-width property and stick to default hwmon policy
> ---
> .../devicetree/bindings/hwmon/pwm-fan.txt | 23 ++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> index 610757c..001446a 100644
> --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> @@ -3,10 +3,33 @@ Bindings for a fan connected to the PWM lines
> Required properties:
> - compatible : "pwm-fan"
> - pwms : the PWM that is used to control the PWM fan
> +- cooling-levels : PWM duty cycle values in a range from 0 to 255
> + which correspond to thermal cooling states
> +
> +Thorough description of the following bindings:
> + cooling-min-state = <0>;
> + cooling-max-state = <3>;
> + #cooling-cells = <2>;
> + thermal-zone {
> + cpu_thermal: cpu-thermal {
> + cooling-maps {
> + map0 {
> + trip = <&cpu_alert1>;
> + cooling-device = <&fan0 0 1>;
> + };
> + };
> + };
> +
> +for PWM FAN used as cooling device can be found at:
> +./Documentation/devicetree/bindings/thermal/thermal.txt
>
> Example:
> pwm-fan {
> compatible = "pwm-fan";
> status = "okay";
> pwms = <&pwm 0 10000 0>;
> + cooling-min-state = <0>;
> + cooling-max-state = <3>;
> + #cooling-cells = <2>;
> + cooling-levels = <0 102 170 255>;
> };
> --
> 2.0.0.rc2
>

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