Response port can be disabled in the ip core configuration, so allow not to specify one. This patch serie is applicable on git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next Olivier Dautricourt (2): dt-bindings: dma: altera-msgdma: make response port optional dmaengine: altera-msgdma: make response port optional .../devicetree/bindings/dma/altr,msgdma.yaml | 4 +- drivers/dma/altera-msgdma.c | 37 +++++++++++++------ 2 files changed, 29 insertions(+), 12 deletions(-) base-commit: 656758425f98693bd61a08f6b51c4c5aa26c9d50 -- 2.31.0.rc2