From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755285AbZIAWWO (ORCPT ); Tue, 1 Sep 2009 18:22:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755236AbZIAWWO (ORCPT ); Tue, 1 Sep 2009 18:22:14 -0400 Received: from mail-bw0-f219.google.com ([209.85.218.219]:44641 "EHLO mail-bw0-f219.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752543AbZIAWWN convert rfc822-to-8bit (ORCPT ); Tue, 1 Sep 2009 18:22:13 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Qpdg5fCLYf+yoUTQge4fHzzwhL/svifuidT5vkzBaJGgLOunMmkkrkSVyRf5+64mTr UHfoHEVQUY5JAB2cLTKpThvsTE35XD/zMG/63P/sUm1F698LpP63xoiXYU+jMkYhGzhK O8qoZsxdFycv62mB8FWpAs7KUTl/mUVQg6FQo= MIME-Version: 1.0 In-Reply-To: References: Date: Wed, 2 Sep 2009 00:22:14 +0200 Message-ID: <63386a3d0909011522m7a175d3eyb3bbe8a29a5fd104@mail.gmail.com> Subject: Re: Montreal Linux Power Management Mini-Summit, July 13, 2009 - Meeting Notes From: Linus Walleij To: Paul Mundt Cc: Linux Power Management List , Linux Kernel Mailing List , Len Brown , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2009/7/31 Len Brown : > 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