ARM: shmobile: bockw: use SSI DMAEngine for sound
R-Car sound driver is supporting Mem <-> SSI direct transfer via DMAEngine. Current HPB-DMA is using double plane transfer, but the sound may have noise since SSI doesn't have FIFO. This patch supports it. Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
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