linux-kernel - Re: [1/2] cpufreq: dt-platdev: Automatically create cpufreq device with OPP v2

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Date:   Mon, 21 Aug 2017 15:17:59 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        geert@...ux-m68k.org, maxime.ripard@...e-electrons.com,
        wens@...e.org, xuwei5@...ilicon.com, kgene@...nel.org,
        krzk@...nel.org, yamada.masahiro@...ionext.com, jun.nie@...aro.org,
        baoyou.xie@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [1/2] cpufreq: dt-platdev: Automatically create cpufreq device
 with OPP v2

On Wed, Aug 16, 2017 at 11:07:27AM +0530, Viresh Kumar wrote:
> The initial idea of creating the cpufreq-dt-platdev.c file was to keep a
> list of platforms that use the "operating-points" (V1) bindings and
> create cpufreq device for them only, as we weren't sure which platforms
> would want the device to get created automatically as some had their own
> cpufreq drivers as well, or wanted to initialize cpufreq after doing
> some stuff from platform code.
> 
> But that wasn't the case with platforms using "operating-points-v2"
> property. We wanted the device to get created automatically without the
> need of adding them to the whitelist. Though, we will still have some
> exceptions where we don't want to create the device automatically.
> 
> Rename the earlier platform list as *whitelist* and create a new
> *blacklist* as well.
> 
> The cpufreq-dt device will get created if:
> - The platform is there in the whitelist OR
> - The platform has "operating-points-v2" property in CPU0's DT node and
>   isn't part of the blacklist .
> 
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

I have exercised this on the r8a7795 and r8a7795 with the following
reverted:

* 034def597bb7 ("cpufreq: rcar: Add support for R8A7795 SoC")
* bea2ebca6b91 ("cpufreq: dt: Add r8a7796 support to to use generic
cpufreq driver")

Tested-by: Simon Horman <horms+renesas@...ge.net.au>