linux-kernel - Re: [PATCH v11 0/4] thermal: samsung: Clean up and add support for Exynos5420

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Message-ID: <20140408093343.GA7947@e102654-lin.cambridge.arm.com>
Date:	Tue, 8 Apr 2014 10:33:43 +0100
From:	Javi Merino <javi.merino@....com>
To:	Naveen Krishna Ch <naveenkrishna.ch@...il.com>
Cc:	Tomasz Figa <t.figa@...sung.com>,
	Leela Krishna Amudala <leelakrishna.a@...il.com>,
	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"rui.zhang@...el.com" <rui.zhang@...el.com>,
	"eduardo.valentin@...com" <eduardo.valentin@...com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"amit.daniel@...sung.com" <amit.daniel@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	"cpgs ." <cpgs@...sung.com>
Subject: Re: [PATCH v11 0/4] thermal: samsung: Clean up and add support for
 Exynos5420

On Thu, Mar 20, 2014 at 02:45:54AM +0000, Naveen Krishna Ch wrote:
> Hello Tomasz,
> 
> On 20 March 2014 00:58, Tomasz Figa <t.figa@...sung.com> wrote:
> > Hi Leela,
> >
> >
> > On 19.03.2014 12:19, Leela Krishna Amudala wrote:
> >>
> >> Hi All,
> >>
> >> I didn't see this series in mainline, Any comments for this ?
> >
> >
> > Naveen had posted v12 of this series and I believe all the patches got my
> > Reviewed-by.
> >
> > Best regards,
> > Tomasz
> Thanks for your reply.
> These patches are posted to the mailing list quite some time now.
> Anything i can do to speed up the process.

These patches create 5 thermal zones, one for each sensor.  Due to the
way the exynos code in drivers/thermal/samsung/exynos_thermal_common.c
registers thermal zones, each one gets a cpufreq_cooling_device.
Therefore you end up with 5 thermal zone each of which is controlling
the cpu frequency.

Wouldn't it be better to collate these 5 sensors to create one thermal
zone for the whole SoC?  Maybe a simplistic algorithm like reporting
the maximum temperature of all the sensors as the thermal zone
temperature is good enough.

Cheers,
Javi

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