2 files changed, 11 insertions, 0 deletions

diff --git a/Documentation/dmaengine/provider.txt b/Documentation/dmaengine/provider.txt
index e33bc1c8ed2c..bfadbfdf13ed 100644
--- a/Documentation/dmaengine/provider.txt
+++ b/Documentation/dmaengine/provider.txt
@@ -395,6 +395,13 @@ where to put them)
           when DMA_CTRL_REUSE is already set
         - Terminating the channel
 
+  * DMA_PREP_CMD
+    - If set, the client driver tells DMA controller that passed data in DMA
+      API is command data.
+    - Interpretation of command data is DMA controller specific. It can be
+      used for issuing commands to other peripherals/register reads/register
+      writes for which the descriptor should be in different format from
+      normal data descriptors.
 
 General Design Notes
 --------------------
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 533680860865..dd4de1d40166 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -186,6 +186,9 @@ struct dma_interleaved_template {
  *  on the result of this operation
  * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till
  *  cleared or freed
+ * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is command
+ *  data and the descriptor should be in different format from normal
+ *  data descriptors.
  */
 enum dma_ctrl_flags {
         DMA_PREP_INTERRUPT = (1 << 0),
@@ -195,6 +198,7 @@ enum dma_ctrl_flags {
         DMA_PREP_CONTINUE = (1 << 4),
         DMA_PREP_FENCE = (1 << 5),
         DMA_CTRL_REUSE = (1 << 6),
+        DMA_PREP_CMD = (1 << 7),
 };
 
 /**