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From: Sireesh Kodali <sireeshkodali1@gmail.com>
To: vkoul@kernel.org, linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-arm-msm@vger.kernel.org
Cc: dmaengine@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht,
	Sireesh Kodali <sireeshkodali1@gmail.com>,
	Jonathan Corbet <corbet@lwn.net>
Subject: [PATCH v2 1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API
Date: Thu, 27 Oct 2022 10:44:27 +0530	[thread overview]
Message-ID: <20221027051429.46593-2-sireeshkodali1@gmail.com> (raw)
In-Reply-To: <20221027051429.46593-1-sireeshkodali1@gmail.com>

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(+)

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


  reply	other threads:[~2022-10-27  5:14 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-27  5:14 [PATCH v2 0/3] dmaengine: Add support for immediate commands Sireesh Kodali
2022-10-27  5:14 ` Sireesh Kodali [this message]
2022-10-27  5:14 ` [PATCH v2 2/3] dmaengine: Add support for immediate commands in the client API Sireesh Kodali
2022-10-27  5:14 ` [PATCH v2 3/3] dmaengine: bam_dma: Add support for immediate commands Sireesh Kodali
2022-11-04 12:40 ` [PATCH v2 0/3] dmaengine: " Vinod Koul
2022-11-11  5:12   ` Sireesh Kodali
2022-11-13 22:23     ` Vinod Koul
2022-11-24  3:14       ` Sireesh Kodali
2022-11-25 16:50       ` Sireesh Kodali

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