dmaengine: rcar-dmac: Document R-Car M3-W bindings

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
(cherry picked from commit 942ba9dc133d82e4ce8cb006e7111aa1b3dcaec7)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed