spi/pl022: map the buffers on the DMA engine
The struct device for the DMA engine is the apropriate one to use when mapping/unmapping buffers. This is because the memory which is addressable by DMA is determined by the DMA engine rather than the device. Reported-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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