linux-kernel - Re: Montreal Linux Power Management Mini-Summit, July 13, 2009

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Message-ID: <63386a3d0909011522m7a175d3eyb3bbe8a29a5fd104@mail.gmail.com>
Date:	Wed, 2 Sep 2009 00:22:14 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Linux Power Management List <linux-pm@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Montreal Linux Power Management Mini-Summit, July 13, 2009 - 
	Meeting Notes

2009/7/31 Len Brown <lenb@...nel.org>:

> A Linux Power Management "mini-summit" was held on July 13th, 2009 -
> on the first day of the Montreal Linux Symposium.
> (...)

> SH running cpufreq on top of clock framework
>        cpufreq has notifiers, clock framework does not

Hm! Paul can you elaborate on what that was about.

I've felt a need for clock notifiers and we've cheated by using
CPUfreq because it so happens that the clocking in system-wide
and whenever the CPU freq change so may the other clocks.

But if I put code into a PrimeCell MMC/SPI/I2C driver or whatever and
use CPUfreq that's very unelegant, and for other platforms where
the CPU freq don't change when this particular device clk freq
change plain misleading.

A clk pre/postchange notifier pair would really help and would
make for elegant drivers that can handle clock freq transitions.

Has anyone poked at this?

Linus Walleij
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