linux-kernel - Re: [PATCHv3 2/8] devfreq: exynos: Add documentation for generic exynos memory bus frequency driver

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Message-id: <54BF2929.3090107@samsung.com>
Date:	Wed, 21 Jan 2015 13:20:57 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Rob Herring <robherring2@...il.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	Mark Rutland <mark.rutland@....com>, a.kesavan@...sung.com,
	Tomasz Figa <tomasz.figa@...il.com>,
	Krzysztof Kozłowski <k.kozlowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	InKi Dae <inki.dae@...sung.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCHv3 2/8] devfreq: exynos: Add documentation for generic
 exynos memory bus frequency driver

On 01/21/2015 12:17 PM, Viresh Kumar wrote:
> On 20 January 2015 at 17:07, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> If each bus-block has separate regulator independently, each bus-block can be registered
>> separately. But, exynos bus-blocks in mem-bus-group share the same regulator.
> 
> This can be managed easily within the driver. Just stay the highest
> voltage requested.

If the clock will be stayed on highest voltage, will reduce
the considerable benefit of power-consumption.

I think it is DFS instead of DVFS. Is it right?

> I don't think its not manageable. But it will be much more convenient
> as that will show
> the correct picture and get rid of unnecessarily virtualizing things..

What is the correct picture? do you need more detailed explanation
of Exynos memory bus structure?

Thanks,
Chanwoo
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