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renesas_usbhs DMAEngine uses D0FIFO/D1FIFO, but the data transfer direction should be fixed for keeping consistency. This patch explain about it on renesas_usbhs.h Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com>