linux-kernel - RE: [linux-pm] Power Domain Framework

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Date:	Tue, 18 May 2010 11:30:50 +0530
From:	Sundar R Iyer <sundar.iyer@...ricsson.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Deepak Sikri <deepak.sikri79@...il.com>,
	Viresh KUMAR <viresh.kumar@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vipin KUMAR <vipin.kumar@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>,
	STEricsson_nomadik_linux <STEricsson_nomadik_linux@...t.st.com>
Subject: RE: [linux-pm] Power Domain Framework

Hi,

> Yeah, sure - obviously, the generic concept of power domains is
> something that does exist within the off-SoC hardware, but on-SoC the
> end implementation is a bit different.

Exactly. This is what I can see if we can bridge this "a bit different".

True, I am dumb to miss out some points, but I think with more inputs,
more thinking, we can definitely make it generic!

Thinking out loud ( excuse me if this is dumb), At the end of the day,
how I see this benefiting a lay driver developer is : use the regulator
API for the appropriate power sources - your SoC domain, your external
regulator domain..etc..etc and ensure a very efficient (probably) run
time PM for your device. All that the Platform guy will do is iterate 
a list of domains on the platform, provide hookups, ensure constraints 
etc and the job is done. Even if the same IP is used on a different SoC,
you still ensure efficient savings in your driver itself.

> As I said in reply to the patch I am concerned that this may be an
> oversimplification relative to what general hardware needs.
Ohh. for the patch set, as I said, its only a primitive implementation.
With your inputs, we can definitely make it more efficient!

Regards,
Sundar

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