linux-kernel - Re: [RFC 1/1] clk: Add notifier support in clk_prepare_enable/clk_disable

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Date:	Fri, 15 Mar 2013 19:23:19 -0700
From:	Bill Huang <bilhuang@...dia.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 1/1] clk: Add notifier support in
 clk_prepare_enable/clk_disable_unprepare

On Fri, 2013-03-15 at 20:33 +0800, Ulf Hansson wrote:
> I guess you did not fully got what I meant with "dvfs clock type". It
> will not affect the clock API. But instead the dvfs is handled by
> implementing a specific clk hw type. So the same thing is accomplished
> as with clk notifiers, no changes should be needed to device drivers.
> 
> The difference is only that no notifiers will be needed, and all the
> dvfs stuff will be handled in the clk hw instead. It will mean that we
> will bundle dvfs stuff into the clock drivers, instead of separating
> the code outside the clock drivers. But, on the other hand no
> notifiers will be needed.
> 
Oh yes I misunderstand your origin point, but my thought is using
existing devfreq framework as frequency/voltage policy driver instead of
creating another one in clock driver and that's why I think we need the
notifier work. 

By the way, some centralized DVFS implementation like Tegra's VDD_CORE
rail has association with tens of clocks which will need to be taken
care specially if we're doing those in clock driver I think.

> Kind regards
> Ulf Hansson


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