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This patch adds the 'device_config' and 'device_prep_slave_sg' interfaces for users to configure DMA, as well as adding one 'struct sprd_dma_config' structure to save Spreadtrum DMA configuration for each DMA channel. Signed-off-by: Eric Long <[email protected]> Signed-off-by: Baolin Wang <[email protected]> Signed-off-by: Vinod Koul <[email protected]>