linux-kernel - Re: [PATCH v2 3/4] cpufreq: mediatek: add Mediatek cpufreq driver

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Date:	Wed, 11 Mar 2015 16:33:49 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Chen Fan <fan.chen@...iatek.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Howard Chen <ibanezchen@...il.com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Pawel Moll <pawel.moll@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	Matthias Brugger <matthias.bgg@...il.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v2 3/4] cpufreq: mediatek: add Mediatek cpufreq driver

On 11 March 2015 at 16:23, Mark Brown <broonie@...nel.org> wrote:
> On Tue, Mar 10, 2015 at 08:20:43AM +0530, Viresh Kumar wrote:
>
> Please don't send upstream e-mail to my work account, I use this address
> pretty consistently for upstream.  Upstream mail to my work account
> frequently ends up unread.

Sorry about that, I did exactly opposite of this earlier :(

>> On 6 March 2015 at 11:19, Pi-Cheng Chen <pi-cheng.chen@...aro.org> wrote:
>> > On 5 March 2015 at 17:55, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
>> > About putting
>> > those stuff into regulator driver, I think you mean creating a
>> > "virtual regulator
>> > device" and put all the voltage controlling complex into the driver, right?
>> > Maybe it's a good idea in this case, but I am sure if this kind of
>> > virtual regulator is acceptable.
>
>> @Mark: Is this allowed to create virtual regulator for a CPU ?
>
> I don't really know what the above means or what problem it's supposed
> to solve.

On mediatek platform, they need to configure two regulators in order to change
DVFS state of the big cluster. The generic cpufreq-dt driver and earlier OPP
bindings have support for a single regulator only and so what Pi-cheng tried
to do is,
- Configure one of the regulators using cpufreq-dt
- And other one using cpufreq frequency change notifiers

This looks awkward..

What I suggested was to create another virtual regulator for CPU which will
eventually configure both the regulators. And so the question that such
virtual regulators are allowed or not.
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