linux-kernel - Re: [PATCH v7 06/20] PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor

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Date:	Wed, 06 Apr 2016 10:12:29 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	최찬우 <cw00.choi@...sung.com>,
	박경민 <kyungmin.park@...sung.com>,
	크쉬시토프 
	<k.kozlowski@...sung.com>, "kgene@...nel.org" <kgene@...nel.org>
Cc:	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux.amoon@...il.com" <linux.amoon@...il.com>,
	"m.reichl@...etechno.de" <m.reichl@...etechno.de>,
	"tjakobi@...h.uni-bielefeld.de" <tjakobi@...h.uni-bielefeld.de>,
	대인기 <inki.dae@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v7 06/20] PM / devfreq: exynos: Add support of bus
 frequency of sub-blocks using passive governor

>   
>  This patch adds the support of bus frequency feature for sub-blocks which share
> the one power line. If each bus depends on the power line, each bus is not able
> to change the voltage by oneself. To optimize the power-consumption on runtime,
> some buses using the same power line should change the source clock and
> regulator at the same time. So, this patch uses the passive governor to support
> the bus frequency for all buses which sharing the one power line.
> 
[]
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> [tjakobi: Reported debugfs error during booting and cw00.choi fix it.]
> Reported-by: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>

Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>