From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sekhar Nori Subject: Re: [Query] CPUFreq: Does these machines have separate clock domains for CPUs? Date: Thu, 29 Aug 2013 15:57:44 +0530 Message-ID: <521F2220.5030403@ti.com> References: <521F2112.5070501@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Viresh Kumar Cc: Jesper Nilsson , Eric Miao , linux-cris-kernel@axis.com, "linux-pm@vger.kernel.org" , Benjamin Herrenschmidt , linux-sh@vger.kernel.org, Miao Steven , Linux Kernel Mailing List , "cpufreq@vger.kernel.org" , Mikael Starvik , Paul Mundt , sparclinux@vger.kernel.org, Dave Jones , David Miller , "linux-arm-kernel@lists.infradead.org" , John Crispin On Thursday 29 August 2013 04:00 PM, Viresh Kumar wrote: > On 29 August 2013 15:53, Sekhar Nori wrote: >> On DaVinci (DA850), there is an async domain available to keep some >> peripheral clocks insulated from cpu frequency changes. But there are a >> bunch of other clocks which do get affected by CPU frequency change >> (they need to run at a fixed ratio to CPU frequency). > > My question wasn't about how peripherals are getting clocks.. but how > CPUs are getting them.. > > Does all CPUs share clock line in Davinci? i.e. if we change freq of one > cpu then freq of other one also gets changed? > > Or they are capable of running at different frequencies? I get it now. All DaVinci devices are UP only. Thanks, Sekhar From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sekhar Nori Date: Thu, 29 Aug 2013 10:39:44 +0000 Subject: Re: [Query] CPUFreq: Does these machines have separate clock domains for CPUs? Message-Id: <521F2220.5030403@ti.com> List-Id: References: <521F2112.5070501@ti.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org On Thursday 29 August 2013 04:00 PM, Viresh Kumar wrote: > On 29 August 2013 15:53, Sekhar Nori wrote: >> On DaVinci (DA850), there is an async domain available to keep some >> peripheral clocks insulated from cpu frequency changes. But there are a >> bunch of other clocks which do get affected by CPU frequency change >> (they need to run at a fixed ratio to CPU frequency). > > My question wasn't about how peripherals are getting clocks.. but how > CPUs are getting them.. > > Does all CPUs share clock line in Davinci? i.e. if we change freq of one > cpu then freq of other one also gets changed? > > Or they are capable of running at different frequencies? I get it now. All DaVinci devices are UP only. Thanks, Sekhar From mboxrd@z Thu Jan 1 00:00:00 1970 From: nsekhar@ti.com (Sekhar Nori) Date: Thu, 29 Aug 2013 15:57:44 +0530 Subject: [Query] CPUFreq: Does these machines have separate clock domains for CPUs? In-Reply-To: References: <521F2112.5070501@ti.com> Message-ID: <521F2220.5030403@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thursday 29 August 2013 04:00 PM, Viresh Kumar wrote: > On 29 August 2013 15:53, Sekhar Nori wrote: >> On DaVinci (DA850), there is an async domain available to keep some >> peripheral clocks insulated from cpu frequency changes. But there are a >> bunch of other clocks which do get affected by CPU frequency change >> (they need to run at a fixed ratio to CPU frequency). > > My question wasn't about how peripherals are getting clocks.. but how > CPUs are getting them.. > > Does all CPUs share clock line in Davinci? i.e. if we change freq of one > cpu then freq of other one also gets changed? > > Or they are capable of running at different frequencies? I get it now. All DaVinci devices are UP only. Thanks, Sekhar From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756366Ab3H2Kcj (ORCPT ); Thu, 29 Aug 2013 06:32:39 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:39453 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756326Ab3H2Kch (ORCPT ); Thu, 29 Aug 2013 06:32:37 -0400 Message-ID: <521F2220.5030403@ti.com> Date: Thu, 29 Aug 2013 15:57:44 +0530 From: Sekhar Nori User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8 MIME-Version: 1.0 To: Viresh Kumar CC: "linux-pm@vger.kernel.org" , "cpufreq@vger.kernel.org" , Linux Kernel Mailing List , "linux-arm-kernel@lists.infradead.org" , Benjamin Herrenschmidt , David Miller , Eric Miao , Jesper Nilsson , John Crispin , , , Mikael Starvik , Paul Mundt , , Miao Steven , Dave Jones Subject: Re: [Query] CPUFreq: Does these machines have separate clock domains for CPUs? References: <521F2112.5070501@ti.com> In-Reply-To: Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 29 August 2013 04:00 PM, Viresh Kumar wrote: > On 29 August 2013 15:53, Sekhar Nori wrote: >> On DaVinci (DA850), there is an async domain available to keep some >> peripheral clocks insulated from cpu frequency changes. But there are a >> bunch of other clocks which do get affected by CPU frequency change >> (they need to run at a fixed ratio to CPU frequency). > > My question wasn't about how peripherals are getting clocks.. but how > CPUs are getting them.. > > Does all CPUs share clock line in Davinci? i.e. if we change freq of one > cpu then freq of other one also gets changed? > > Or they are capable of running at different frequencies? I get it now. All DaVinci devices are UP only. Thanks, Sekhar