linux-kernel - Re: [PATCH v5 1/6] Documentation: dts: Documentation entry to explain how to use PWM FAN as a cooling device

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Date:	Wed, 25 Feb 2015 15:13:03 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Kamil Debski <k.debski@...sung.com>,
	Jean Delvare <jdelvare@...e.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Kukjin Kim <kgene@...nel.org>, 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>
Subject: Re: [PATCH v5 1/6] Documentation: dts: Documentation entry to
 explain how to use PWM FAN as a cooling device

On Wed, Feb 25, 2015 at 03:11:24PM -0400, Eduardo Valentin wrote:
> On Wed, Feb 25, 2015 at 04:34:17PM +0100, Lukasz Majewski wrote:
> > 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
> > Changes for v5:
> > - Move thermal-zones description to example section
> > - Extending example section
> > 
> > ---
> >  .../devicetree/bindings/hwmon/pwm-fan.txt          | 25 +++++++++++++++++++++-
> >  1 file changed, 24 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> > index 610757c..645251b 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
> >  
> >  Example:
> > -	pwm-fan {
> > +	fan0: pwm-fan {
> >  		compatible = "pwm-fan";
> >  		status = "okay";
> >  		pwms = <&pwm 0 10000 0>;
> > +		cooling-levels = <0 102 170 230>;
> > +	};
> > +
> > +	thermal-zones {
> > +		cpu_thermal: cpu-thermal {
> > +		cooling-min-state = <0>;
> > +		cooling-max-state = <3>;
> > +		#cooling-cells = <2>;
> > +		trips {
> > +			cpu_alert1: cpu-alert1 {
> > +				temperature = <100000>; /* millicelsius */
> > +				hysteresis = <2000>; /* millicelsius */
> > +				type = "passive";
> > +			};
> > +		};
> > +		cooling-maps {
> > +			map0 {
> > +			     trip = <&cpu_alert1>;
> > +			     cooling-device = <&fan0 0 1>;
> > +			};
> > +		};
> 
> The above example has two issues:
> (1) it is wrong, as the cooling device properties are in the thermal
> zone node.
> (2) has a misalignment / tabulation
> 
> Can you please fix that in your next version too?


Apart from the above two issues you may add my 
Acked-by: Eduardo Valentin <edubezval@...il.com>

> 
> >  	};
> > -- 
> > 2.0.0.rc2
> > 



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