linux-kernel - Re: [PATCH v4 5/8] ARM: dts: Add properties to use pwm-fan device as a cooling device in Odroid U3

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Message-id: <20150225142815.562fe22b@amdc2363>
Date:	Wed, 25 Feb 2015 14:28:15 +0100
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Eduardo Valentin <edubezval@...il.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 v4 5/8] ARM: dts: Add properties to use pwm-fan device as a
 cooling device in Odroid U3

Hi Eduardo,

> On Wed, Feb 18, 2015 at 11:07:33AM +0100, Lukasz Majewski wrote:
> > With those bindings it is possible to use pwm-fan device available
> > in Odroid U3 as a cooling device.
> > 
> > Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> > ---
> > Changes for v2:
> > - Rename cooling-pwm-values property to cooling-levels
> > Changes for v3:
> > - Change patch's topic to "ARM dts"
> > - Reduce maximal cooling-level to 230 from 255
> > Changes for v4:
> > - None
> > ---
> >  arch/arm/boot/dts/exynos4412-odroidu3.dts | 33
> > ++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1
> > deletion(-)
> > 
> > diff --git a/arch/arm/boot/dts/exynos4412-odroidu3.dts
> > b/arch/arm/boot/dts/exynos4412-odroidu3.dts index 60bd1e4..3e5df3e
> > 100644 --- a/arch/arm/boot/dts/exynos4412-odroidu3.dts
> > +++ b/arch/arm/boot/dts/exynos4412-odroidu3.dts
> > @@ -32,11 +32,42 @@
> >  		};
> >  	};
> >  
> > -	pwm-fan {
> > +	fan0: pwm-fan {
> >  		compatible = "pwm-fan";
> >  		pwms = <&pwm 0 10000 0>;
> > +		cooling-min-state = <0>;
> > +		cooling-max-state = <3>;
> > +		#cooling-cells = <2>;
> > +		cooling-levels = <0 102 170 230>;
> >  		status = "okay";
> >  	};
> > +
> > +	thermal-zones {
> > +		cpu_thermal: cpu-thermal {
> 
> 
> This thermal zone misses the mandatory properties as per 
>  Documentation/devicetree/bindings/thermal/thermal.txt

Following mandatory properties:
		thermal-sensors = <&tmu 0>;
		polling-delay-passive = <0>;
		polling-delay = <0>;
		trips {

		}

are defined in exynos4-cpu-thermal.dtsi included by this file.

In this patch only device dependent changes are stated.

> 
> > +			cooling-maps {
> > +				map0 {
> > +				     trip = <&cpu_alert1>;
> > +				     cooling-device = <&cpu0 7 7>;
> > +				};
> > +				map1 {
> > +				     trip = <&cpu_alert2>;
> > +				     cooling-device = <&cpu0 13
> > 13>;
> > +				};
> > +				map2 {
> > +				     trip = <&cpu_alert0>;
> > +				     cooling-device = <&fan0 0 1>;
> > +				};
> > +				map3 {
> > +				     trip = <&cpu_alert1>;
> > +				     cooling-device = <&fan0 1 2>;
> > +				};
> > +				map4 {
> > +				     trip = <&cpu_alert2>;
> > +				     cooling-device = <&fan0 2 3>;
> > +				};
> > +			};
> > +		};
> > +	};
> >  };
> >  
> >  &pwm {
> > -- 
> > 2.0.0.rc2
> > 



-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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