serial: sprd: Add DMA mode support
Add DMA mode support for the Spreadtrum serial controller. Signed-off-by: Lanqing Liu <lanqing.liu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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