linux-kernel - Re: [PATCH 0/2] PM / OPP: updates to enable sharing OPPs info

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Message-ID: <519B45C3.8050700@arm.com>
Date:	Tue, 21 May 2013 11:00:35 +0100
From:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
To:	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
CC:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Shawn Guo <shawn.guo@...aro.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 0/2] PM / OPP: updates to enable sharing OPPs info

Hi Rob, Grant,

On 01/05/13 12:11, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
> 
> 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

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