linux-kernel - Re: [Query] CPUFreq: Does these machines have separate clock domains for CPUs?

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Message-ID: <521F2220.5030403@ti.com>
Date:	Thu, 29 Aug 2013 15:57:44 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Eric Miao <eric.y.miao@...il.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	John Crispin <blogic@...nwrt.org>,
	<linux-cris-kernel@...s.com>, <linux-sh@...r.kernel.org>,
	Mikael Starvik <starvik@...s.com>,
	Paul Mundt <lethal@...ux-sh.org>, <sparclinux@...r.kernel.org>,
	Miao Steven <realmz6@...il.com>, Dave Jones <davej@...hat.com>
Subject: Re: [Query] CPUFreq: Does these machines have separate clock domains
 for CPUs?

On Thursday 29 August 2013 04:00 PM, Viresh Kumar wrote:
> On 29 August 2013 15:53, Sekhar Nori <nsekhar@...com> 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
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