linux-kernel - Re: [linux-pm] OpPoint summary

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Date:	Mon, 18 Sep 2006 07:33:24 -0700
From:	"Richard A. Griffiths" <richard.griffiths@...driver.com>
To:	Pavel Machek <pavel@....cz>
Cc:	David Singleton <daviado@...il.com>, linux-pm@...ts.osdl.org,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] OpPoint summary

On Sun, 2006-09-17 at 19:48 +0200, Pavel Machek wrote:
> Hi!
> 
> > >Care to resend your patches in the proper format, through email so that
> > >we can see them, and possibly get some testing in -mm if they look sane?
> > 
> > Greg,
> >   here's the patch that implements operating points for different 
> >   frequencies
> > for the speedstep-centrino line of processors.  Operating points are created
> > in much the same manner that cpufreq tables are.  This works for both
> > simple implementations like the centrino and more complex SoC systems
> > like the arm-pxa72x which has several clocks to control, and different clock
> > divisors and multipliers.
> 
> > +static struct oppoint lowest = {
> > +       .name = "lowest",
> > +       .type = PM_FREQ_CHANGE,
> > +       .frequency = 0,
> > +       .voltage = 0,
> > +       .latency = 15,
> > +       .prepare_transition  = cpufreq_prepare_transition,
> > +       .transition = centrino_transition,
> > +       .finish_transition = cpufreq_finish_transition,
> > +};
> 
> We had nice, descriptive interface... with numbers. Now you want to
> introduce english state names... looks like a step back to me.

Maybe a compromise could be reached where a defined set of numbers maps
to  string names ala Unix init states. Many people (at least me) still
invoke init 6 to reboot a system.  A defined table would satisfy both
the number and string camps.

Richard
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