dmaengine: sprd: Add Spreadtrum DMA configuration
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: NEric Long <eric.long@spreadtrum.com> Signed-off-by: NBaolin Wang <baolin.wang@linaro.org> Signed-off-by: NVinod Koul <vkoul@kernel.org>
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