linux-kernel - [PATCH v2 1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API

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Message-Id: <20221027051429.46593-2-sireeshkodali1@gmail.com>
Date:   Thu, 27 Oct 2022 10:44:27 +0530
From:   Sireesh Kodali <sireeshkodali1@...il.com>
To:     vkoul@...nel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-msm@...r.kernel.org
Cc:     dmaengine@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        Sireesh Kodali <sireeshkodali1@...il.com>,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH v2 1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API

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@...il.com>
---
 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 ceac2a300e32..5afe21191299 100644
--- a/Documentation/driver-api/dmaengine/provider.rst
+++ b/Documentation/driver-api/dmaengine/provider.rst
@@ -590,6 +590,16 @@ 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 should 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
-- 
2.38.1