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Re: [PATCH v1 3/3] [loongson] 2f: add CPUFreq support

To: Wu Zhangjin <>
Subject: Re: [PATCH v1 3/3] [loongson] 2f: add CPUFreq support
From: Ralf Baechle <>
Date: Tue, 17 Nov 2009 14:10:59 +0100
Cc:,, Dave Jones <>, Dominik Brodowski <>,,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <>
User-agent: Mutt/1.5.19 (2009-01-05)
On Tue, Nov 17, 2009 at 01:32:59AM +0800, Wu Zhangjin wrote:

> Subject: [PATCH v1 3/3] [loongson] 2f: add CPUFreq support
> Loongson2f add a new capability to dynamicly scale cpu frequency. And
> when we put it into wait mode via setting the frequency as ZERO, it will
> wait there until an external interrupt take place, which will help
> saving power for us.
> And as the last patch described, to enable this support, an external
> timer is needed to avoid getting wrong system time when using the MIPS
> Timer, 'Cause the MIPS Timer's frequency is half of the cpu frequency,
> when the cpu frequency is changed, the MIPS Timer will be not accuracy.
> This version incorporates the feedback from "Dominik Brodowski
> <>" to register transition notifier before
> register_driver().

Thanks, queue for 2.6.33.


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