mmc: omap: add DMA engine support
Add DMA engine support to the OMAP driver. This supplements the private DMA API implementation contained within this driver, and the driver can be switched at build time between using DMA engine and the private DMA API. Tested-by: NTony Lindgren <tony@atomide.com> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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