spi: Add support for specifying 3-wire mode via device tree
This patch allows to specify that a SPI device is connected in 3-wire mode via device tree. Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Acked-by: NRob Herring <rob.herring@calxeda.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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