i2c: add docs to clarify DMA handling

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit d4e01186ae1c6045b5a508741f2446dffec7511c)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed