76a096637d
For some devices with only half-duplex capabilities, it doesn't make much sense to use one DMA channel per direction, as both channels will never be active at the same time. Add support for bidirectional I/O on DMA channels. The client drivers can then request a "tx-rx" DMA channel which will be used for both directions. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20211206174259.68133-7-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
31 KiB
31 KiB