dmaengine: bcm2835: Add slave dma support
Add slave transfer capability to BCM2835 dmaengine driver.
This patch is pulled from the bcm2708-dmaengine driver in the
Raspberry Pi repo. The work was done by Gellert Weisz.
Tested using the bcm2835-mmc driver from the same repo.
Signed-off-by:
Noralf Trønnes <noralf@tronnes.org>
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