Re: nokia 770 [was Re: community PM requirements/issues and PowerOP]

Dave Jones
2006-12-13T22:58:02Z

On Wed, Dec 13, 2006 at 02:50:12PM -0800, Matthew Locke wrote:
>
> >>> I'd find that it's used on N770, as a good way to kick in low
> >>> voltage
> >>> operation modes.
> >>
> >> Except that cpufreq doesn't really support voltage changes
> >
> > The majority of cpufreq drivers in the tree right now support
> > voltage scaling just fine.
>
> Ok, let's reword my sentence. The cpufreq interface does not support
> voltage as a parameter

Please explain why this is useful at all.
Under what circumstance is "Set the CPU voltage to 1.2V" a useful thing
for a user, sysadmin, or application to do ?

The voltage something runs at is utterly irrelevant to all the above.
Given it's inherently tied to the speed a chip runs at, which makes
a lot more sense for all the above scenarios to change, we export that instead.

AFAICS, exposing voltages to userspace would be completely pointless.

Dave

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