Re: [linux-pm] [PATCH] PowerOP, PowerOP Core, 1/2

[Matthew Locke <matt@nomadgs.com>]

On Sep 23, 2006, at 4:18 AM, Pavel Machek wrote:

> Hi!
>
>> Note that I don't think PowerOp would cover all devices. In fact, I
>> think most devices would remain autonomous or controlled as part of
>> specific subsystems. The only things that PowerOp would bundle 
>> together
>> would be things that aren't independent (and may not even be visible 
>> as
>> "devices" in the usual Linux sense), but that have to be managed
>> together in changing frequency/voltage. At least, that's the way I
>> imagined it would work.
>
> Well, two objections to that
>
> a) current powerop code does not handle 256 CPU machine, because that
> would need 256 independend bundles, and powerop has hardcoded "only
> one bundle" rule.

The 256 is only a temporary implementation limitation.

>
> b) having some devices controlled by powerop and some by specific
> subsystem is indeed ugly. I'd hope powerop would cover all the
> devices. (Or maybe cover _no_ devices). Userland should not need to
> know if touchscreen is part of SoC or if it happens to be independend
> on given machine.

PowerOP does *not* cover devices.  It covers system level parameters 
such clocks, buses, voltages.

>
> 								Pavel
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) 
> http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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