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

From: Viresh Kumar <viresh.kumar@linaro.org>
To: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	"Joe.C" <yingjoe.chen@mediatek.com>,
	Eddie Huang <eddie.huang@mediatek.com>,
	Howard Chen <ibanezchen@gmail.com>,
	Ashwin Chaugule <ashwin.chaugule@linaro.org>,
	Mike Turquette <mturquette@linaro.org>,
	Chen Fan <fan.chen@mediatek.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v2 1/4] cpufreq-dt: add clock domain and intermediate frequency support
Date: Thu, 5 Mar 2015 09:28:38 +0530	[thread overview]
Message-ID: <CAKohpo=zPsezGs8rqVzx3ChQkavs5z7eFMMETe12pc2mjm-8OA@mail.gmail.com> (raw)
In-Reply-To: <CALx668XCh46yMLajThuVzba9RRSxf+tEkNuMP9J7w-=vsZN8-Q@mail.gmail.com>

On 5 March 2015 at 09:02, Pi-Cheng Chen <pi-cheng.chen@linaro.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.

> 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.