Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933148Ab3IDH1m (ORCPT ); Wed, 4 Sep 2013 03:27:42 -0400 Received: from mail-lb0-f169.google.com ([209.85.217.169]:57777 "EHLO mail-lb0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755142Ab3IDH1j (ORCPT ); Wed, 4 Sep 2013 03:27:39 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Wed, 4 Sep 2013 16:27:37 +0900 Message-ID: Subject: Re: [Query] CPUFreq: Does these machines have separate clock domains for CPUs? From: Magnus Damm To: Viresh Kumar Cc: "linux-pm@vger.kernel.org" , "cpufreq@vger.kernel.org" , Linux Kernel Mailing List , "linux-arm-kernel@lists.infradead.org" , Jesper Nilsson , Eric Miao , linux-cris-kernel@axis.com, SH-Linux , Benjamin Herrenschmidt , Miao Steven , Sekhar Nori , Mikael Starvik , Paul Mundt , sparclinux@vger.kernel.org, Dave Jones , David Miller , John Crispin Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1608 Lines: 53 Hi Viresh, On Fri, Aug 30, 2013 at 4:33 PM, Viresh Kumar wrote: > On 30 August 2013 12:18, Magnus Damm wrote: >> Hi Viresh, >> >> On Thu, Aug 29, 2013 at 7:15 PM, Viresh Kumar wrote: >>> Hi, >>> >>> I have been doing some CPUFreq cleanup work and >>> wanted to know if the below mentioned machines have separate >>> clock domains for their CPUs or all share the same domain? >>> >>> So, that we can use some generic routines for these drivers which >>> would eventually do: >>> >>> cpumask_setall(policy->cpus); >>> >>> And I wanted to make sure that this doesn't break them.. :) >>> >>> ...... >>> >>> The drivers are: >> ... >>> drivers/cpufreq/sh-cpufreq.c >> ... >> >> The above SH cpufreq driver seems to be written with SMP in mind, but >> I would say SMP is a very rare case for SH. So I believe it can be >> considered as UP-only at this point. If Paul disagrees I'm quite sure >> he will tell us. > > Okay.. The problem isn't really SMP but different clock domains for CPUs > in a SMP system.. > > So, even if we have a SMP SH machine, will it have same clock line for > all CPUs? Yeah, I understand your question but I'm afraid that I don't know the answer myself. > I will go with the change anyway.. Good plan. Thanks for cleaning up the cpufreq bits. Cheers, / magnus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/