From: bryanh@codeaurora.org (Bryan Huntsman)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2 1/4] cpufreq: add arm soc generic cpufreq driver
Date: Fri, 16 Dec 2011 11:59:02 -0800 [thread overview]
Message-ID: <4EEBA306.3060309@codeaurora.org> (raw)
In-Reply-To: <20111216105229.GB3230@totoro>
On 12/16/2011 02:52 AM, Jamie Iles wrote:
>
>> +static DEFINE_PER_CPU(unsigned long, l_p_j_ref);
>> +static unsigned long l_p_j_ref_freq;
>> +
>> +static struct clk *cpu_clk;
>
> This assumes that all CPU's share the same clk and run at the same rate.
> Is that a fair/safe assumption? I honestly don't know the answer to
> this so it's just a question!!!
On MSM, cpus independently scale both frequency and voltage. Our clock
driver isn't upstream yet. David Brown has a preliminary version here:
https://www.codeaurora.org/gitweb/quic/kernel/?p=davidb/linux-msm.git;a=shortlog;h=refs/heads/msm-clock-rfc
Once we get our driver upstream, MSM will be an exception and not select
ARM_GENERIC_CPUFREQ. We'll probably have a separate msm-cpufreq.c
driver under drivers/cpufreq/.
- Bryan
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
next prev parent reply other threads:[~2011-12-16 19:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-16 10:30 [PATCH V2 0/4] add arm soc generic cpufreq driver Richard Zhao
2011-12-16 10:30 ` [PATCH V2 1/4] cpufreq: " Richard Zhao
2011-12-16 10:52 ` Jamie Iles
2011-12-16 19:59 ` Bryan Huntsman [this message]
2011-12-17 8:39 ` Richard Zhao
2011-12-19 1:03 ` Richard Zhao
2011-12-19 17:42 ` Stephen Boyd
2011-12-17 8:29 ` Richard Zhao
2011-12-16 11:26 ` Heiko Stübner
2011-12-17 7:57 ` Richard Zhao
2011-12-16 14:32 ` Rob Herring
2011-12-17 8:00 ` Richard Zhao
2011-12-17 9:29 ` Arnd Bergmann
2011-12-18 12:34 ` Richard Zhao
2011-12-20 14:41 ` Mark Brown
2012-01-18 11:39 ` Mark Brown
2012-01-18 11:42 ` Mark Brown
2012-01-18 20:51 ` Grant Likely
2011-12-16 10:31 ` [PATCH V2 2/4] dts/imx6q: add cpufreq property Richard Zhao
2011-12-16 10:31 ` [PATCH V2 3/4] arm/imx6q: register arm_clk as cpu to clkdev Richard Zhao
2011-12-16 16:35 ` Mark Langsdorf
2011-12-17 7:56 ` Richard Zhao
2011-12-16 10:31 ` [PATCH V2 4/4] arm/imx6q: select ARCH_HAS_CPUFREQ Richard Zhao
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