linux-kernel - Re: [PATCH v3 2/2] cpufreq: tegra: Re-model Tegra cpufreq driver

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Date:	Thu, 19 Dec 2013 13:57:33 +0800
From:	bilhuang <bilhuang@...dia.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Stephen Warren <swarren@...dotorg.org>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] cpufreq: tegra: Re-model Tegra cpufreq driver

On 12/19/2013 01:29 PM, Viresh Kumar wrote:
> On 19 December 2013 10:56, bilhuang <bilhuang@...dia.com> wrote:
>> I'm not sure virtual regulator for CPU is a good idea, in addition to that,
>> we don't have a single SoC OPP table, we need several which are speedo-id
>> and process-id dependant, but generic cpufreq-cpu0 is assuming there is only
>> one statically
>
> Can't that be handled via DT ?
I don't think it can be handled via DT unless we separate DTB according 
to different CPU speedo/process-id but that is not a good idea.
>
>> for some SoC the frequency table is not fixed, they are
>> created at runtime combining our fast and slow CPU frequency table and dvfs
>> table. So I'm really not sure is it worth adding so many tweaks in order to
>> use the generic cpufreq-cpu0 driver.
>
> Hmm, maybe I got confused because I don't have a clear picture in my mind.
> It might be better to go ahead with your implementation for now and after
> everything is set, we can choose to use cpufreq-cpu0 if it is worth it.
>
This makes more sense to me, thanks.
> --
> viresh
>

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