linux-kernel - Re: [PATCH v2 1/4] cpufreq-dt: add clock domain and intermediate frequency support

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Date:	Thu, 5 Mar 2015 15:28:47 +0800
From:	Pi-Cheng Chen <pi-cheng.chen@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Howard Chen <ibanezchen@...il.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Chen Fan <fan.chen@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/4] cpufreq-dt: add clock domain and intermediate
 frequency support

On 5 March 2015 at 11:58, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 5 March 2015 at 09:02, Pi-Cheng Chen <pi-cheng.chen@...aro.org> wrote:
>> In the case of Mediatek SoC, the intermediate frequency might not be one entry
>> of OPP table. To elaborate, the source clock node of the CPUs/Cluster on
>> Mediatek SoC is a mux. The mux has several PLLs as parents. When we are
>> doing CPU frequency scaling, the mux should re-parent to another stable PLL,
>> wait until the original parent PLL become stable, and then switch back to the
>> original parent. In this case, we could but we might not want the intermediate
>> frequency as part of OPP table. Therefore I save intermediate_freq instead of
>> intermediate frequency index in the cpufreq_dt_platform_datat struct.
>
> Hmm, I remember that discussion. Okay leave it as is.

Okay.

>
>> BTW, is this case that intermediate frequency is not necessarily be one entry
>> of OPP table supported in the OPPv2 bindings?
>
> Not yet, but will add a property for that.

Thanks for taking this case into consideration.

Best Regards,
Pi-Cheng
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