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On some sh-mobile systems there are more than one DMA controllers, that can be used for serial ports. Specifying a DMA device in sh-sci platform data unnecessarily restricts the driver to only use one DMA controller. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> [Fixed the trivial conflict in include/linux/serial_sci.h] Signed-off-by: Vinod Koul <vinod.koul@intel.com>