[PATCH 4/4] dma/acc: add doc

[Chengwen Feng <fengchengwen@huawei.com>]

This commit adds document for accelerator DMA driver.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 MAINTAINERS                            |  1 +
 doc/guides/dmadevs/acc.rst             | 63 ++++++++++++++++++++++++++
 doc/guides/dmadevs/index.rst           |  1 +
 doc/guides/rel_notes/release_25_11.rst |  6 +++
 4 files changed, 71 insertions(+)
 create mode 100644 doc/guides/dmadevs/acc.rst

diff --git a/MAINTAINERS b/MAINTAINERS
index 42717363a0..ca3a8a421b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1366,6 +1366,7 @@ F: doc/guides/dmadevs/hisilicon.rst
 HiSilicon Accelerator DMA
 M: Chengwen Feng <fengchengwen@huawei.com>
 F: drivers/dma/acc/
+F: doc/guides/dmadevs/acc.rst
 
 Marvell CNXK DPI DMA
 M: Vamsi Attunuru <vattunuru@marvell.com>
diff --git a/doc/guides/dmadevs/acc.rst b/doc/guides/dmadevs/acc.rst
new file mode 100644
index 0000000000..41fc24877f
--- /dev/null
+++ b/doc/guides/dmadevs/acc.rst
@@ -0,0 +1,63 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright (c) 2025 HiSilicon Technologies Co., Ltd. All rights reserved.
+
+HISILICON Accelerator DMA Driver
+================================
+
+Kunpeng SoC has an internal accelerator unit which includes zip function, and
+the zip also supports data copy and fill. This driver exposes this capability to
+DPDK application.
+
+
+Supported Kunpeng SoCs
+----------------------
+
+* Kunpeng 920
+
+
+Device Setup
+-------------
+
+In order to use the device in DPDK, user should insmod uacce.ko, hisi_qm.ko and
+hisi_zip.ko(with module parameter uacce_mode=1), then there will be several
+subdirectories whose names start with hisi_zip in /sys/class/uacce/ directory.
+
+Device Probing and Initialization
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+User should use following method to probe device::
+
+        $ dpdk-app -a uacce:hisi_zip-0,queues=2 ...
+
+hisi_zip-0 is the directory name in the /sys/class/uacce/ directory, queues is
+runtime config parameter which indicates how many dmadevs are created.
+
+If the probe is successful, two dmadevs are created, named "hisi_zip-0-dma0"
+and "hisi_zip-0-dma1".
+
+.. note::
+        In the /sys/class/uacce/hisi_zip-x/ directory, user could query api and
+        algorithms, this driver can only match the device whose api is
+        hisi_qm_v5 and algorithms contain udma.
+
+Device Configuration
+~~~~~~~~~~~~~~~~~~~~~
+
+Configuration requirements:
+
+* ``ring_size`` obtain from UACCE API and is a fixed value.
+* Only one ``vchan`` is supported per ``dmadev``.
+* Silent mode is not supported.
+* The transfer direction must be set to ``RTE_DMA_DIR_MEM_TO_MEM``.
+
+
+Device Datapath Capability and Limitation
+-----------------------------------------
+
+Support memory copy and fill operations.
+
+.. note::
+        Currently, the maximum size of the operation data is limited to 16MB-1B
+        in the driver. The device actually supports operations in a larger data
+        size, but the driver requires complex operations in the datapth. If you
+        have such requirement, please contact the maintainers.
diff --git a/doc/guides/dmadevs/index.rst b/doc/guides/dmadevs/index.rst
index 15ddaf5192..dcc8c189ba 100644
--- a/doc/guides/dmadevs/index.rst
+++ b/doc/guides/dmadevs/index.rst
@@ -11,6 +11,7 @@ an application through DMA API.
    :maxdepth: 1
    :numbered:
 
+   acc
    cnxk
    dpaa
    dpaa2
diff --git a/doc/guides/rel_notes/release_25_11.rst b/doc/guides/rel_notes/release_25_11.rst
index ccad6d89ff..977f4c7e43 100644
--- a/doc/guides/rel_notes/release_25_11.rst
+++ b/doc/guides/rel_notes/release_25_11.rst
@@ -55,6 +55,12 @@ New Features
      Also, make sure to start the actual text at the margin.
      =======================================================
 
+    * **Add Hisilicon Accelerator DMA Driver.**
+
+    Kunpeng SoC has an internal accelerator unit which includes zip function,
+    and the zip also support data copy and fill. This driver exposes this
+    capability to DPDK application.
+
 
 Removed Items
 -------------
-- 
2.17.1