spi: davinci: add additional comments
Add comments describing the platform data members and per-chip-select SPI configuration structure. Also, add some comments describing the what happens during the driver probe. Signed-off-by: NBrian Niebuhr <bniebuhr@efjohnson.com> Tested-By: NMichael Williamson <michael.williamson@criticallink.com> Signed-off-by: NSekhar Nori <nsekhar@ti.com>
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