linux-kernel - Re: [linux-pm] Notes from the Boston Linux Power Management Mini-summit

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Message-ID: <4C69E13D.3020809@codeaurora.org>
Date:	Mon, 16 Aug 2010 18:09:17 -0700
From:	Bryan Huntsman <bryanh@...eaurora.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Len Brown <lenb@...nel.org>,
	Linux Power Management List <linux-pm@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [linux-pm] Notes from the Boston Linux Power	Management	Mini-summit
 - August 9th, 2010

Mark Brown wrote:
> On Sun, Aug 15, 2010 at 01:36:33AM -0400, Len Brown wrote:
> 
>> A gap:
>>
>> On OMAP, bus control is independent of CPU frequency control,
>> so cpufreq and cpuidle don't quite fit the bill.
>>
>> Perhaps a "bus-idle" analogous to "cpu-idle" may be appropriate?
> 
> FWIW this applies to a bunch of other embedded processors too - OMAP
> isn't particularly unique here, though it's one of the furthest along in
> terms of exploting this in mainline Linux.

This capability would benefit MSM as well.  We're looking into a 
soc-specific implementation using Pat Pannuto's "pseudo" platform bus 
extensions (discussed here http://lkml.org/lkml/2010/8/10/389).  After 
we have something working, I would be curious to see if some common 
functionality could be extracted into a more generic mechanism.

- Bryan

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