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Date: Wed, 18 Feb 2015 11:07:31 +0100 From: Lukasz Majewski <l.majewski@...sung.com> To: Eduardo Valentin <edubezval@...il.com>, Kamil Debski <k.debski@...sung.com>, Jean Delvare <jdelvare@...e.de>, Guenter Roeck <linux@...ck-us.net>, Kukjin Kim <kgene@...nel.org> Cc: lm-sensors@...sensors.org, Linux PM list <linux-pm@...r.kernel.org>, "linux-samsung-soc@...r.kernel.org" <linux-samsung-soc@...r.kernel.org>, devicetree@...r.kernel.org, Lukasz Majewski <l.majewski@...ess.pl>, Kukjin Kim <kgene.kim@...sung.com>, linux-kernel@...r.kernel.org, Sjoerd Simons <sjoerd.simons@...labora.co.uk>, Abhilash Kesavan <kesavan.abhilash@...il.com>, Abhilash Kesavan <a.kesavan@...sung.com>, Lukasz Majewski <l.majewski@...sung.com> Subject: [PATCH v4 3/8] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device Explanation of several properties, which allow PWM fan working as a cooling device, have been embraced in this commit. Signed-off-by: Lukasz Majewski <l.majewski@...sung.com> --- Changes for v2: - Rename cooling-pwm-values to cooling-levels - Remove default-pulse-width property and stick to default hwmon policy Changes for v3: - Changing commit title from "hwmon: dts: Doc:" to "Documentation: dts" - Remove unnecessary properties - Set maximal cooling level to 230 instead of 255 Changes for v4: - None --- Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757c..d53fe0c 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -3,10 +3,30 @@ 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-levels = <0 102 170 230>; }; -- 2.0.0.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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