On Wed May 6 17:32:49 2026 +0800, Bin Du wrote:
> Add documentation for AMD ISP 4 and describe the main components
>
> Co-developed-by: Svetoslav Stoilov <[email protected]>
> Signed-off-by: Svetoslav Stoilov <[email protected]>
> Signed-off-by: Bin Du <[email protected]>
> Reviewed-by: Mario Limonciello (AMD) <[email protected]>
> Reviewed-by: Sultan Alsawaf <[email protected]>
> Tested-by: Alexey Zagorodnikov <[email protected]>
> Tested-by: Kate Hsuan <[email protected]>
> Signed-off-by: Sakari Ailus <[email protected]>
Patch committed.
Thanks,
Sakari Ailus
Documentation/admin-guide/media/amdisp4-1.rst | 63 +++++++++++++++++++++++++
Documentation/admin-guide/media/amdisp4.dot | 6 +++
Documentation/admin-guide/media/v4l-drivers.rst | 1 +
MAINTAINERS | 2 +
4 files changed, 72 insertions(+)
---
diff --git a/Documentation/admin-guide/media/amdisp4-1.rst
b/Documentation/admin-guide/media/amdisp4-1.rst
new file mode 100644
index 000000000000..878141154f96
--- /dev/null
+++ b/Documentation/admin-guide/media/amdisp4-1.rst
@@ -0,0 +1,63 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+====================================
+AMD Image Signal Processor (amdisp4)
+====================================
+
+Introduction
+============
+
+This file documents the driver for the AMD ISP4 that is part of
+AMD Ryzen AI Max 300 Series.
+
+The driver is located under drivers/media/platform/amd/isp4 and uses
+the Media-Controller API.
+
+The driver exposes one video capture device to userspace and provide
+web camera like interface. Internally the video device is connected
+to the isp4 sub-device responsible for communication with the CCPU FW.
+
+Topology
+========
+
+.. _amdisp4_topology_graph:
+
+.. kernel-figure:: amdisp4.dot
+ :alt: Diagram of the media pipeline topology
+ :align: center
+
+
+
+The driver has 1 sub-device: Representing isp4 image signal processor.
+The driver has 1 video device: Capture device for retrieving images.
+
+- ISP4 Image Signal Processing Subdevice Node
+
+---------------------------------------------
+
+The isp4 is represented as a single V4L2 subdev, the sub-device does not
+provide interface to the user space. The sub-device is connected to one video
node
+(isp4_capture) with immutable active link. The sub-device represents ISP with
+connected sensor similar to smart cameras (sensors with integrated ISP).
+sub-device has only one link to the video device for capturing the frames.
+The sub-device communicates with CCPU FW for streaming configuration and
+buffer management.
+
+
+- isp4_capture - Frames Capture Video Node
+
+------------------------------------------
+
+Isp4_capture is a capture device to capture frames to memory.
+The entity is connected to isp4 sub-device. The video device
+provides web camera like interface to userspace. It supports
+mmap and dma buf types of memory.
+
+Capturing Video Frames Example
+==============================
+
+.. code-block:: bash
+
+ v4l2-ctl "-d" "/dev/video0"
"--set-fmt-video=width=1920,height=1080,pixelformat=NV12" "--stream-mmap"
"--stream-count=10"
diff --git a/Documentation/admin-guide/media/amdisp4.dot
b/Documentation/admin-guide/media/amdisp4.dot
new file mode 100644
index 000000000000..978f30c1a31a
--- /dev/null
+++ b/Documentation/admin-guide/media/amdisp4.dot
@@ -0,0 +1,6 @@
+digraph board {
+ rankdir=TB
+ n00000001 [label="{{} | amd isp4\n | {<port0> 0}}", shape=Mrecord,
style=filled, fillcolor=green]
+ n00000001:port0 -> n00000003 [style=bold]
+ n00000003 [label="Preview\n/dev/video0", shape=box, style=filled,
fillcolor=yellow]
+}
diff --git a/Documentation/admin-guide/media/v4l-drivers.rst
b/Documentation/admin-guide/media/v4l-drivers.rst
index d31da8e0a54f..4621eae9fa1e 100644
--- a/Documentation/admin-guide/media/v4l-drivers.rst
+++ b/Documentation/admin-guide/media/v4l-drivers.rst
@@ -9,6 +9,7 @@ Video4Linux (V4L) driver-specific documentation
.. toctree::
:maxdepth: 2
+ amdisp4-1
bttv
c3-isp
cafe_ccic
diff --git a/MAINTAINERS b/MAINTAINERS
index b92e9625d84c..81d53481d3f7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1158,6 +1158,8 @@ M: Nirujogi Pratap <[email protected]>
L: [email protected]
S: Maintained
T: git git://linuxtv.org/media.git
+F: Documentation/admin-guide/media/amdisp4-1.rst
+F: Documentation/admin-guide/media/amdisp4.dot
F: drivers/media/platform/amd/Kconfig
F: drivers/media/platform/amd/Makefile
F: drivers/media/platform/amd/isp4/Kconfig
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