linux-kernel - Re: [PATCH v7 2/3] cpufreq: mediatek: Add MT8173 cpufreq driver

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Date:	Wed, 19 Aug 2015 11:11:20 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Pi-Cheng Chen <pi-cheng.chen@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Michael Turquette <mturquette@...libre.com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v7 2/3] cpufreq: mediatek: Add MT8173 cpufreq driver

On 19-08-15, 10:05, Pi-Cheng Chen wrote:
> Mediatek MT8173 is an ARMv8 based quad-core (2*Cortex-A53 and
> 2*Cortex-A72) SoC with duall clusters. For each cluster, two voltage
> inputs, Vproc and Vsram are supplied by two regulators. For the big
> cluster, two regulators come from different PMICs. In this case, when
> scaling voltage inputs of the cluster, the voltages of two regulator
> inputs need to be controlled by software explicitly under the SoC
> specific limitation:
> 
> 	100mV < Vsram - Vproc < 200mV
> 
> which is called 'voltage tracking' mechanism. And when scaling the
> frequency of cluster clock input, the input MUX need to be parented to
> another "intermediate" stable PLL first and reparented to the original
> PLL once the original PLL is stable at the target frequency. This patch
> implements those mechanisms to enable CPU DVFS support for Mediatek
> MT8173 SoC.
> 
> Signed-off-by: Pi-Cheng Chen <pi-cheng.chen@...aro.org>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> 
> Changes in v7:
> - add of_machine_is_compatible() check to be multiplatform friendly

Looks fine, thanks.

-- 
viresh
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