From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sudeep KarkadaNagesha Subject: Re: [PATCH 0/2] PM / OPP: updates to enable sharing OPPs info Date: Tue, 21 May 2013 11:00:35 +0100 Message-ID: <519B45C3.8050700@arm.com> References: <1367406679-21603-1-git-send-email-Sudeep.KarkadaNagesha@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1367406679-21603-1-git-send-email-Sudeep.KarkadaNagesha-5wv7dgnIgG8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: "grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" , "rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org" , "devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org" Cc: "linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "Rafael J. Wysocki" List-Id: devicetree@vger.kernel.org Hi Rob, Grant, On 01/05/13 12:11, Sudeep KarkadaNagesha wrote: > From: Sudeep KarkadaNagesha > > These are couple of updates to existing PM/OPP library to support > sharing of OPPs between different device nodes. > > Currently all the cpu nodes are parsed until the OPPs are found. This > is essential to support cpuhotplug without having to replicate OPP > information in all the cpu nodes. > > However in systems with multiple cpu power domain, its better to have > OPP entry for each cpu. To avoid replication, phandle can be specified > to the node which contains the full OPP information. > Is proposed option of phandle for OPP acceptable to avoid replication ? Any suggestions to proceed on this ? This is needed to support CPU hotplug on big LITTLE system where current methods like parsing all the nodes or just CPU0 node will not work. Regards, Sudeep