linux-kernel - Re: MMC: Make the configuration memory resource optional

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Date:	Wed, 05 Aug 2009 14:34:03 +0100
From:	Ian Molton <ian@...menth.co.uk>
To:	Magnus Damm <magnus.damm@...il.com>
CC:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	pHilipp Zabel <philipp.zabel@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, Pierre Ossman <drzeus@...eus.cx>,
	Magnus Damm <damm@...nsource.se>
Subject: Re: MMC: Make the configuration memory resource optional

Hi all,

Could all non-MFD users of tmio-mmc please ensure that the following is 
actually true on your hardware?

   mmc->f_max = pdata->hclk;
   mmc->f_min = mmc->f_max / 512;

According to all the data I have, the smallest divider setting of 0x100 
is /2 and only MFD controllers with the CNF area can select no-divider mode.

this would mean that non-MFD chips should be doing:

   mmc->f_max = pdata->hclk / 2;
   mmc->f_min = pdata->hclk / 512;
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