spi/spi-atmel: add support transfer on CS1,2,3, not only on CS0
Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com> Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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