dmaengine: Document cyclic transfer for dmaengine_prep_peripheral_dma_vec()

Document that the DMA_PREP_REPEAT flag can be used with the
dmaengine_prep_peripheral_dma_vec() to mark a transfer as cyclic similar
to dmaengine_prep_dma_cyclic().

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20260303-axi-dac-cyclic-support-v2-1-0db27b4be95a@analog.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 99efe2b9b4ea9844ca6161208362ef18ef111d96..b3d251c9734e95e1b75cf6763d4d2c3a1c6a9910 100644 (file)
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -996,7 +996,8 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
  * @vecs: The array of DMA vectors that should be transferred
  * @nents: The number of DMA vectors in the array
  * @dir: Specifies the direction of the data transfer
- * @flags: DMA engine flags
+ * @flags: DMA engine flags - DMA_PREP_REPEAT can be used to mark a cyclic
+ *         DMA transfer
  */
 static inline struct dma_async_tx_descriptor *dmaengine_prep_peripheral_dma_vec(
        struct dma_chan *chan, const struct dma_vec *vecs, size_t nents,