From mboxrd@z Thu Jan 1 00:00:00 1970 From: linus.ml.walleij@gmail.com (Linus Walleij) Date: Wed, 2 Sep 2009 00:22:14 +0200 Subject: Montreal Linux Power Management Mini-Summit, July 13, 2009 - Meeting Notes In-Reply-To: References: Message-ID: <63386a3d0909011522m7a175d3eyb3bbe8a29a5fd104@mail.gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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