[0/1] dmaengine: xilinx_dma: Set dma_device.directions

Message

Folker Schwesinger March 12, 2025, 6:36 p.m. UTC

Currently it is not possible to use the Xilinx DMA driver as a backend
for IIO drivers. Setting up IIO DMA buffers with
devm_iio_dmaengine_buffer_setup() fails because dma_get_slave_caps()
always returns -ENXIO. The reason is that the Xilinx DMA driver does not
set the directions field in struct dma_device, which is checked in
dma_get_slave_caps().

This patch fixes this issue. It basically is a partial resend of this
patch [1], modified to apply on dmaengine->next. It was discussed back
in 2018 in this thread [2].
As I'm quite new to the kernel dev process, I'm not sure if I should
have included any tags to give credit to the original patch author.

[1]: https://patchwork.kernel.org/project/linux-dmaengine/patch/[e-mail]/
[2]: https://lore.kernel.org/lkml/20180111062111.GH18649@localhost/T/

Folker Schwesinger (1):
  dmaengine: xilinx_dma: Set dma_device.directions

 drivers/dma/xilinx/xilinx_dma.c | 2 ++
 1 file changed, 2 insertions(+)


base-commit: 6565439894570a07b00dba0b739729fe6b56fba4