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

From: Eduardo Valentin
Date: Mon Nov 02 2015 - 16:24:32 EST

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 (çåæ) 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.


> Regards,
> Sudeep
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