linux-kernel - Re: [patch 7/7] SDHCI: Add change

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Message-ID: <20081119194309.0982a47e@mjolnir.drzeus.cx>
Date:	Wed, 19 Nov 2008 19:43:09 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org,
	sdhci-devel@...t.drzeus.cx
Subject: Re: [patch 7/7] SDHCI: Add change_clock callback for glue drivers

On Sat, 15 Nov 2008 23:57:39 +0000
Ben Dooks <ben-linux@...ff.org> wrote:

> 
> The controller has a number of possible clock sources, the bus clock
> it is connected to (generally called hclk) and three more clocks from
> the heirachy that is muxed/divided from either an 48MHz, 27MHz or the
> EPLL.
> 
> The callback allows the recalculation and selection of the best clock
> to run the card clock for the controller.
>  

Can these clock sources change mid-flight? Otherwise I don't see the
need for a callback up to the sdhci core. But I don't see any
connection points for such events.

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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