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

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Date:	Fri, 14 Nov 2008 23:20:21 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	linux-kernel@...r.kernel.org, sdhci-devel@...t.drzeus.cx,
	Ben Dooks <ben-linux@...ff.org>
Subject: Re: [patch 7/7] SDHCI: Add change_clock callback for glue drivers

On Mon, 03 Nov 2008 20:09:51 +0000
Ben Dooks <ben-linux@...ff.org> wrote:

> Add a change_clock callback to allow drivers to update
> device specific clock selections and control registers
> when there is a change in clock.
> 
> Move the main part of sdhci_set_clock() to a new routine
> which can be called by the glue drivers to do the sdhci
> standard clock management.
> 
> Update the sdhci-s3c driver to use this to select the
> appropriate clock source when clocks change.
> 
> Signed-off-by: Ben Dooks <ben-linux@...ff.org>
> 

I'm afraid I don't quite follow on the requirements here. Care to
elaborate as to why this is needed?

> Index: linux.git/drivers/mmc/host/sdhci-pci.c
> ===================================================================
> --- linux.git.orig/drivers/mmc/host/sdhci-pci.c	2008-11-03 12:17:50.000000000 +0000
> +++ linux.git/drivers/mmc/host/sdhci-pci.c	2008-11-03 12:18:41.000000000 +0000
> @@ -391,6 +391,7 @@ static int sdhci_pci_enable_dma(struct s
>  
>  static struct sdhci_ops sdhci_pci_ops = {
>  	.enable_dma	= sdhci_pci_enable_dma,
> +	.change_clock	= sdhci_change_clock,
>  };
>  
>  /*****************************************************************************\

This seems pointless :)

> @@ -950,6 +955,8 @@ out:
>  	host->clock = clock;
>  }
>  
> +EXPORT_SYMBOL_GPL(sdhci_set_clock);
> +

Wrong symbol. :)

-- 
     -- Pierre Ossman

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

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