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Some devices have more than just simple TX and RX DMA channels, for example modern Samsung I2S IPs support a secondary transmit DMA stream which is mixed into the primary stream during playback. Allow such devices to specify the names of the channels to be requested in their dma_data. Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Lars-Peter Clausen <lars@metafoo.de>