[PATCH 1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API
From: Sireesh Kodali <hidden>
Date: 2021-09-19 14:44:16
Also in:
dmaengine, linux-arm-msm, lkml, phone-devel
Subsystem:
dma generic offload engine subsystem, documentation, the rest · Maintainers:
Vinod Koul, Jonathan Corbet, Linus Torvalds
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 <redacted> --- Documentation/driver-api/dmaengine/provider.rst | 10 ++++++++++ 1 file changed, 10 insertions(+)
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
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2.33.0