dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous
The same information could be extracted from the struct dma_chan. The patch introduces helper function dwc_get_data_width() as well. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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