Re: [PATCH v7 2/2] cpufreq: airoha: Add EN7581 CPUFreq SMCCC driver

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On Fri, 13 Dec 2024 at 23:35, Christian Marangi <ansuelsmth@xxxxxxxxx> wrote:
>
> On Fri, Dec 13, 2024 at 09:30:01AM +0530, Viresh Kumar wrote:
> > On 12-12-24, 13:01, Ulf Hansson wrote:
> > > On Fri, 6 Dec 2024 at 22:16, Christian Marangi <ansuelsmth@xxxxxxxxx> wrote:
> > > Hmm, it looks like this needs to be moved and possibly split up.
> > >
> > > The provider part (for the clock and power-domain) belongs in
> > > /drivers/pmdomain/*, along with the other power-domain providers.
> > >
> > > Other than that, I was really expecting the cpufreq-dt to take care of the rest.
> > >
> > > To me, the above code belongs in a power-domain provider driver. While
> > > the below should be taken care of in cpufreq-dt, except for the device
> > > registration of the cpufreq-dt device, I guess.
> > >
> > > Viresh, what's your view on this?
> >
> > Sure, no issues.. These are all cpufreq related, but don't necessarily belong in
> > the cpufreq directory.
> >
>
> Problem is really DT schema... I wonder if it's acceptable to push a
> name-only driver in pmdomain just do detach from cpufreq. The cpufreq
> driver would manually probe the pmdomain. Is it acceptable?
>
> Or do you have alternative solution for this?

The power-domain provider driver should use the compatible
"airoha,en7581-cpufreq". This driver should be responsible for
registering the genpd and the clock.

Potentially, the power-domain provider driver could also register the
"cpufreq-dt" platform-device. To make this work, we also need to
extend the cpufreq-dt driver (maybe extend its platform-data too?) to
be capable of attaching the corresponding cpu-devices to their
power(perf)-domains. For the moment, this isn't supported, but I think
it would be nice if it could. Another option, would be to use an
additional separate name-based cpufreq-driver, as in the
qcom-cpufreq-nvmem.c, that then becomes responsible for registering
the cpufreq-dt device.

Viresh, do you have a better approach in mind?

Kind regards
Uffe




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