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The DMAEngine provides an interface for obtaining DMA transaction descriptors from an array of scatter gather buffers represented by struct dma_vec. This interface is used in the DMABUF API of the IIO framework [1][2]. To enable DMABUF support through the IIO framework for the Xilinx DMA, implement callback .device_prep_peripheral_dma_vec() of struct dma_device in the driver. [1]:7a86d46998("iio: buffer-dmaengine: Support new DMABUF based userspace API") [2]:5878853fc9("dmaengine: Add API function dmaengine_prep_peripheral_dma_vec()") Signed-off-by: Folker Schwesinger <dev@folker-schwesinger.de> Reviewed-by: Suraj Gupta <suraj.gupta2@amd.com> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> Link: https://lore.kernel.org/r/DCCKQLKOZC06.2H6LJ8RJQJNV2@folker-schwesinger.de Signed-off-by: Vinod Koul <vkoul@kernel.org>