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From: Baruch Siach <>
To: Cliff Brake <>
Subject: Re: PXA270 SPI + SD card
Date: Thu, 5 Nov 2009 08:17:21 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi Cliff,

On Wed, Nov 04, 2009 at 04:54:18PM -0500, Cliff Brake wrote:
> Also, what SPI mode is typically used for SD?  Looks like 0 and 3 are
> the closest (

I've found this in drivers/mmc/host/mmc_spi.c:mmc_spi_probe():

        /* MMC and SD specs only seem to care that sampling is on the
         * rising edge ... meaning SPI modes 0 or 3.  So either SPI mode
         * should be legit.  We'll use mode 0 since the steady state is 0,
         * which is appropriate for hotplugging, unless the platform data
         * specify mode 3 (if hardware is not compatible to mode 0).
        if (spi->mode != SPI_MODE_3)
                spi->mode = SPI_MODE_0;


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      parent reply	other threads:[~2009-11-05  6:17 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-04 21:53 PXA270 SPI + SD card Cliff Brake
     [not found] ` <>
2009-11-04 21:54   ` Cliff Brake
     [not found]     ` <>
2009-11-04 23:27       ` Ned Forrester
2009-11-05  6:17       ` Baruch Siach [this message]

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