linux-kernel - Re: [PATCH v4 2/9] cpufreq: Auto-register the driver as a thermal cooling device if asked

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Date:   Tue, 29 Jan 2019 09:51:21 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Tao Wang <kevin.wangtao@...ilicon.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v4 2/9] cpufreq: Auto-register the driver as a thermal
 cooling device if asked

On Mon, Jan 28, 2019 at 5:34 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> On Monday, January 28, 2019 9:32:44 AM CET Daniel Lezcano wrote:
> > On 28/01/2019 07:41, Amit Kucheria wrote:
> > > All cpufreq drivers do similar things to register as a cooling device.
> > > Provide a cpufreq driver flag so drivers can just ask the cpufreq core
> > > to register the cooling device on their behalf. This allows us to get
> > > rid of duplicated code in the drivers.
> > >
> > > In order to allow this, we add a struct thermal_cooling_device pointer
> > > to struct cpufreq_policy so that drivers don't need to store it in a
> > > private data structure.
> > >
> > > Suggested-by: Stephen Boyd <swboyd@...omium.org>
> > > Suggested-by: Viresh Kumar <viresh.kumar@...aro.org>
> > > Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> > > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> > > Tested-by: Matthias Kaehlcke <mka@...omium.org>
> > > ---
> >
> > [ ... ]
> >
> > > +/*
> > > + * Set by drivers that want the core to automatically register the cpufreq
> > > + * driver as a thermal cooling device.
> > > + */
> > > +#define CPUFREQ_AUTO_REGISTER_COOLING_DEV  BIT(7)
> > > +
> >
> > Isn't the CPUFREQ_IS_COOLING_DEV more appropriate? We define a property
> > of the cpufreq driver and the resulting action is to auto-register, no?
>
> Yes.

OK, will send out another series with this change and the IS_ENABLED guards.

Thank you everyone for the review.