atmel_spi: minor updates
Minor updates to atmel_spi: - DMA: * Comments to explain the DMA policies * Report any mapping errors from spi_transfer() * Remove extra loop for DMA mapping - Diagnostics: report minimum clock rate, if we need to reject a spi_setup() request because that rate is too low. Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net> Acked-by: NHaavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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