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    SubjectRe: MMC: Make the configuration memory resource optional
    On Wed, 5 Aug 2009, Ian Molton wrote:

    > 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;

    That's what I currently have in the driver, yes.

    > 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;

    How do we verify this? Do I need some "very fast" card, so that sd would
    try to drive the clock beyond pdata->hclk / 2, which should then fail?
    Currently I'm using 24MHz (copied from the original driver), and the only
    thing I know about the controller is its "Maximum operating frequency: 25

    Guennadi Liakhovetski

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      Last update: 2009-08-05 21:47    [W:0.020 / U:6.452 seconds]
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