linux-kernel - Re: [PATCH 1/2] cpufreq: hisilicon: add acpu driver

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Message-ID: <20150302111406.GA18498@leoy-linaro>
Date:	Mon, 2 Mar 2015 19:14:07 +0800
From:	Leo Yan <leo.yan@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Dan Zhao <dan.zhao@...ilicon.com>, zhenwei.wang@...ilicon.com,
	mohaoju@...ilicon.com
Subject: Re: [PATCH 1/2] cpufreq: hisilicon: add acpu driver

On Mon, Mar 02, 2015 at 04:34:34PM +0530, Viresh Kumar wrote:
> On 2 March 2015 at 16:20, Leo Yan <leo.yan@...aro.org> wrote:
> > i'm glad to use more general method, let me give more input so that we
> > can see if can figure out a better way. ;)
> 
> And I am glad to hear that :)
> 
> > 1. From hardware design, during the initialization phase, it will
> > bind every opps with its corresponding voltage, and pass these related
> > info to power controller. So later, in kernel the cpufreq driver don't
> > need manually change the voltage, it will only change the cpu clock
> > frequency and power controller will automatically handle voltage
> > related operations. This is similar with TC's SPC implementation.
> >
> > So looks likely the cpufreq-dt driver's voltage related ops are
> > redundant for this case.
> 
> Its okay, they wouldn't harm. You don't have to specify any regulator
> in CPUs DT node and the code will not try any fancy stuff :)

If so, it's make sense to directly use cpufreq-dt driver; i will try
it firstly. Appreciate for suggestion :)

Thanks,
Leo Yan
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