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
next prev parent 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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