Extend the binding to support specifying a different request type for
each direction.
Signed-off-by: NPaul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20211206174259.68133-3-paul@crapouillou.netSigned-off-by: NVinod Koul <vkoul@kernel.org>