Re: [PATCH 5/8] thermal:cpu cooling:tegra: Provide deferred probing for tegra driver
From: Thierry Reding
Date: Mon Nov 17 2014 - 08:09:10 EST
On Mon, Nov 17, 2014 at 02:51:24PM +0200, Mikko Perttunen wrote:
> On 11/17/2014 01:43 PM, Thierry Reding wrote:
> >On Fri, Nov 14, 2014 at 12:47:33PM +0200, Mikko Perttunen wrote:
> >>Tested-by: Mikko Perttunen <mikko.perttunen@xxxxxxxx>
> >>One potential issue I can see is that if the cpufreq driver fails to probe
> >>then you'll never get the thermal driver either. For example, Tegra124
> >>currently has no cpufreq driver, so if CONFIG_CPU_THERMAL was enabled, then
> >>the soctherm driver would never be able to probe. But I don't really have a
> >>solution for this either.
> >It doesn't seem like there's any code whatsoever to deal with cpufreq
> >within the soctherm driver, so deferring probe based on something we're
> >not using anyway seems rather useless.
> My understanding is that there needs to be no code inside soctherm to handle
> it, as the cpufreq driver (cpufreq-dt) will register a cooling device that
> will then be bound to the soctherm sensors using the of-thermal device tree
> properties. At this moment, however, we don't have that cpufreq driver so
> this patch is still useless for Tegra.
But if the cpufreq driver will automatically do this already, why do we
even need to check for it in the soctherm driver?
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