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[1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API

Message ID 20210919144322.31977-2-sireeshkodali1@gmail.com (mailing list archive)
State Not Applicable
Headers show
Series DMAengine: Add support for Immediate commands | expand

Commit Message

Sireesh Kodali Sept. 19, 2021, 2:43 p.m. UTC 
Immediate commands are used by the IPA driver to send commands to the
microcontroller over BAM. These are different from PREP_CMD.

Signed-off-by: Sireesh Kodali <sireeshkodali1@gmail.com>
---
 Documentation/driver-api/dmaengine/provider.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst
index ddb0a81a796c..f92a0bae06a0 100644
--- a/Documentation/driver-api/dmaengine/provider.rst
+++ b/Documentation/driver-api/dmaengine/provider.rst
@@ -571,6 +571,16 @@  DMA_CTRL_REUSE
     writes for which the descriptor should be in different format from
     normal data descriptors.
 
+- DMA_PREP_IMM_CMD
+
+  - If set, the client driver tells DMA controller that passed data in DMA
+    API is immediate command data.
+
+  - Interpretation of command data is DMA controller specific. It can be
+    used for issuing immediate commands to other peripherals/register
+    reads/register writes for which the descriptor shoudl be in a
+    different format from normal data descriptors.
+
 - DMA_PREP_REPEAT
 
   - If set, the transfer will be automatically repeated when it ends until a