linux-kernel - Re: [PATCH] mmc: append a file to change host clock at run time

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Date:	Wed, 13 Oct 2010 10:08:14 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Chris Ball <cjb@...top.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <ext-andriy.shevchenko@...ia.com>
Subject: Re: [PATCH] mmc: append a file to change host clock at run time

On Tue, Oct 12, 2010 at 6:17 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> For debugging power managment features there is quite convenient to have a
> possibility to change MMC host controller clock at run time. This patch adds
> 'clock' file under MMC host root of debugfs.
>
> Usage as follows:
>
>        # cat /sys/kernel/debug/mmc0/clock
>        24000000
Actually this value should be 52000000 here.

>
>        # echo "1000000000" > /sys/kernel/debug/mmc0/clock
>        # cat /sys/kernel/debug/mmc0/clock
>        52000000
>
>        # echo "48000000" > /sys/kernel/debug/mmc0/clock
>        # cat /sys/kernel/debug/mmc0/clock
>        48000000
>
> The second piece of example shows limits which are applied accordingly to used
> host driver.


-- 
With Best Regards,
Andy Shevchenko
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