From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukasz Majewski Subject: [PATCH 2/9] hwmon: dts: Doc: Add DTS doc to explain how to use PWM FAN as a cooling device Date: Thu, 18 Dec 2014 11:13:04 +0100 Message-ID: <1418897591-18332-3-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> Return-path: In-reply-to: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> Sender: linux-kernel-owner@vger.kernel.org To: Eduardo Valentin , Kamil Debski , Jean Delvare , Guenter Roeck Cc: lm-sensors@lm-sensors.org, Linux PM list , "linux-samsung-soc@vger.kernel.org" , devicetree@vger.kernel.org, Lukasz Majewski , Kukjin Kim , linux-kernel@vger.kernel.org, Sylwester Nawrocki , Lukasz Majewski List-Id: devicetree@vger.kernel.org Several new properties to allow PWM fan working as a cooling device have been combined into this single commit. Signed-off-by: Lukasz Majewski --- .../devicetree/bindings/hwmon/pwm-fan.txt | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757c..3877810 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -3,10 +3,38 @@ 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-pwm-values : PWM duty cycle values relative to + cooling-max-pwm-value correspondig to + proper cooling states +- default-pulse-width : Property specifying default pulse width for FAN + at system boot (zero to disable FAN on boot). + Allowed range is 0 to 255 + +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-pwm-values = <0 102 170 255>; + default-pulse-width = <0>; }; -- 2.0.0.rc2