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mmc_spi: allow setting of spi mode 3 

Allow the platform data structures to specify spi mode 3
(if there is a pullup on the clock line or the spi hardware
is not able to serve spi mode 0).

Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Wolfgang Muees 2009-03-11 14:13:15 +01:00 committed by Pierre Ossman
parent b8e2006d5b
commit 48881caec4
1 changed files with 5 additions and 3 deletions
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8
drivers/mmc/host/mmc_spi.c
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@ -1204,10 +1204,12 @@ static int mmc_spi_probe(struct spi_device *spi)
/* 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 it seems to be a
* bit less troublesome on some hardware ... unclear why.
* 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).
*/
spi->mode = SPI_MODE_0;
if (spi->mode != SPI_MODE_3)
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
status = spi_setup(spi);