linux-kernel - Re: [RESEND][PATCH] clockevent: let set

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Message-ID: <alpine.LFD.2.00.0901161227480.3400@localhost.localdomain>
Date:	Fri, 16 Jan 2009 12:28:09 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Magnus Damm <magnus.damm@...il.com>
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	johnstul@...ibm.com, lethal@...ux-sh.org, mingo@...hat.com
Subject: Re: [RESEND][PATCH] clockevent: let set_mode() setup delta
 information

On Fri, 16 Jan 2009, Magnus Damm wrote:
> From: Magnus Damm <damm@...l.co.jp>
> 
> Allow the set_mode() clockevent callback to decide and fill in delta
> details such as shift, mult, max_delta_ns and min_delta_ns.
> 
> With this change the clockevent can be registered without delta details
> which allows us to keep the parent clock disabled until the clockevent
> gets setup using set_mode().
> 
> Letting set_mode() fill in or update delta details allows us to save
> power by disabling the parent clock while the clockevent is unused.
> This may however make the parent clock rate change, so next time the
> clockevent gets enabled we need let set_mode() to update the detla
> details accordingly. Doing it at registration time is not enough.
> 
> Furthermore, the delta details seem unused in the case of periodic-only
> clockevent drivers, so this change also allows registration of such
> drivers without the delta details filled in.
> 
> Signed-off-by: Magnus Damm <damm@...l.co.jp>

Applied to tip/timers/clockevents

Thanks,

	tglx
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