From: Sireesh Kodali <sireeshkodali1@gmail.com>
To: phone-devel@vger.kernel.org,
~postmarketos/upstreaming@lists.sr.ht, dmaengine@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org
Cc: Sireesh Kodali <sireeshkodali1@gmail.com>,
Vinod Koul <vkoul@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
linux-doc@vger.kernel.org (open list:DOCUMENTATION)
Subject: [PATCH 1/3] doc: dmaengine: client-api: Add immediate commands in the DMA client API
Date: Sun, 19 Sep 2021 20:13:19 +0530 [thread overview]
Message-ID: <20210919144322.31977-2-sireeshkodali1@gmail.com> (raw)
In-Reply-To: <20210919144322.31977-1-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 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
--
2.33.0
next prev parent reply other threads:[~2021-09-19 14:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-19 14:43 [RFC PATCH 0/3] DMAengine: Add support for Immediate commands Sireesh Kodali
2021-09-19 14:43 ` Sireesh Kodali [this message]
2021-09-19 14:43 ` [PATCH 2/3] dmaengine: Add support for immediate commands in the client API Sireesh Kodali
2021-09-19 14:43 ` [PATCH 3/3] dmaengine: qcom: bam_dma: Add support for immediate commands Sireesh Kodali
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210919144322.31977-2-sireeshkodali1@gmail.com \
--to=sireeshkodali1@gmail.com \
--cc=corbet@lwn.net \
--cc=dmaengine@vger.kernel.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=phone-devel@vger.kernel.org \
--cc=vkoul@kernel.org \
--cc=~postmarketos/upstreaming@lists.sr.ht \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).