linux-kernel - Re: [PATCH] thermal: of: Introduce governor selection in dts

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Message-ID: <20151102212420.GH4469@localhost.localdomain>
Date:	Mon, 2 Nov 2015 13:24:22 -0800
From:	Eduardo Valentin <edubezval@...il.com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Javi Merino <javi.merino@....com>,
	"Chung-Yih Wang (王崇懿)" 
	<cywang@...gle.com>, Zhang Rui <rui.zhang@...el.com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] thermal: of: Introduce governor selection in dts

On Tue, Aug 11, 2015 at 10:07:31AM +0100, Sudeep Holla wrote:
> 
> 
> On 10/08/15 18:47, Javi Merino wrote:
> >On Mon, Aug 10, 2015 at 09:00:49AM +0100, Chung-Yih Wang (王崇懿) wrote:
> >>This patch was originally introduced when we made power_allocator the
> >>default governor where we had issues in binding a thermal zone w/o
> >>parameters to. Then we came out this facility for binding a specific
> >>governor to a thermal zone in dts instead of the default governor.
> >>Javi seems like this idea much.
> >
> >While I can understand why this is not suitable for devicetree, we
> >should have a way in the kernel to configure different governors for
> >different thermal zones defined in device tree.  Thermal zones defined
> >from platform code can choose the thermal governor when they are
> >registered.
> >
> >If this information can't go in device tree, where can we put it? As
> >an additional parameter to thermal_zone_of_sensor_register()?
> >
> 
> Why can't it be via sysfs allowing users to select their choice of
> governor ? (like cpuidle/freq or even devfreq I assume)
> 

Yes, sysfs configuration is the current recommended way. 

Although it is tempting to have it in device tree, its
design decisions are not meant for OS implementation/specifics.

BR,

> Regards,
> Sudeep
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