linux-kernel - Re: [PATCH v1 8/9] Documentation: add documentation of AMD isp 4 driver

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Message-ID: <2b86e89b-6816-45b6-864a-712353c0e5b3@amd.com>
Date: Fri, 13 Jun 2025 10:43:27 +0800
From: "Du, Bin" <bin.du@....com>
To: mchehab@...nel.org, hverkuil@...all.nl,
 laurent.pinchart+renesas@...asonboard.com, bryan.odonoghue@...aro.org,
 sakari.ailus@...ux.intel.com, prabhakar.mahadev-lad.rj@...renesas.com,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: pratap.nirujogi@....com, benjamin.chan@....com, king.li@....com,
 gjorgji.rosikopulos@....com, Phil.Jawich@....com, Dominic.Antony@....com,
 Svetoslav.Stoilov@....com
Subject: Re: [PATCH v1 8/9] Documentation: add documentation of AMD isp 4
 driver

Change-Id should be removed and will be fixed in V2

On 6/8/2025 10:49 PM, Bin Du wrote:
> Add documentation for AMD isp 4 and describe the main components
> 
> Signed-off-by: Bin Du <Bin.Du@....com>
> Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
> Change-Id: I61dfb3a39e5ae372ed48f156a81ae81ee17734b2
> ---
>   Documentation/admin-guide/media/amdisp4-1.rst | 60 +++++++++++++++++++
>   Documentation/admin-guide/media/amdisp4.dot   |  8 +++
>   2 files changed, 68 insertions(+)
>   create mode 100644 Documentation/admin-guide/media/amdisp4-1.rst
>   create mode 100644 Documentation/admin-guide/media/amdisp4.dot
> 
> diff --git a/Documentation/admin-guide/media/amdisp4-1.rst b/Documentation/admin-guide/media/amdisp4-1.rst
> new file mode 100644
> index 000000000000..c933e7ae171d
> --- /dev/null
> +++ b/Documentation/admin-guide/media/amdisp4-1.rst
> @@ -0,0 +1,60 @@
> +.. 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 385 SoC.
> +
> +The driver is located under drivers/media/platform/amd/isp4 and uses
> +the Media-Controller API.
> +
> +Topology
> +========
> +.. _amdisp4_topology_graph:
> +
> +.. kernel-figure:: amdisp4.dot
> +     :alt:   Diagram of the media pipeline topology
> +     :align: center
> +
> +
> +
> +The driver has 1 sub-device:
> +
> +- isp: used to resize and process bayer raw frames in to yuv.
> +
> +The driver has 1 video device:
> +
> +- <capture 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 isp entity is connected
> +to sensor pad 0 and receives the frames using CSI-2 protocol. The sub-device is
> +also responsible to configure CSI2-2 receiver.
> +The sub-device processes bayer raw data from the connected sensor and output
> +them to different YUV formats. The isp also has scaling capabilities.
> +
> +  - isp4_capture - Frames Capture Video Node
> +-------------------------------------------------------------
> +Isp4_capture is a capture device to capture frames to memory.
> +This entity is the DMA engine that write the frames to memory.
> +The entity is connected to isp4 sub-device.
> +
> +Capturing Video Frames Example
> +==============================
> +.. code-block:: bash
> +
> +         # set the links
> +
> +         # start streaming:
> +         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..a4c2f0cceb30
> --- /dev/null
> +++ b/Documentation/admin-guide/media/amdisp4.dot
> @@ -0,0 +1,8 @@
> +digraph board {
> +	rankdir=TB
> +	n00000001 [label="{{<port0> 0} | amd isp4\n | {<port1> 1}}", shape=Mrecord, style=filled, fillcolor=green]
> +	n00000001:port1 -> n00000004 [style=bold]
> +	n00000004 [label="Preview\n/dev/video0", shape=box, style=filled, fillcolor=yellow]
> +	n0000000a [label="{{} | ov05c10 22-0010\n/dev/v4l-subdev0 | {<port0> 0}}", shape=Mrecord, style=filled, fillcolor=green]
> +	n0000000a:port0 -> n00000001:port0 [style=bold]
> +}