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Message-ID: <AANLkTinvBhcUBQHXRcLeuFW9a0f5xb9G7TzffPP+=7_5@mail.gmail.com> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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