On 3/13/24 08:25, Sakari Ailus wrote:
Add new MIPI CCS embedded data media bus code
(MEDIA_BUS_FMT_CCS_EMBEDDED).
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Reviewed-by: Julien Massot <julien.massot@xxxxxxxxxxxxx>
---
.../media/v4l/subdev-formats.rst | 28 +++++++++++++++++++
include/uapi/linux/media-bus-format.h | 3 ++
2 files changed, 31 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/subdev-formats.rst b/Documentation/userspace-api/media/v4l/subdev-formats.rst
index cbd475f7cae9..c8f982411e70 100644
--- a/Documentation/userspace-api/media/v4l/subdev-formats.rst
+++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst
@@ -8564,3 +8564,31 @@ and finally the bit number in subscript. "X" indicates a padding bit.
- X
- X
- X
+
+.. _MEDIA-BUS-FMT-CCS-EMBEDDED:
+
+MIPI CCS Embedded Data Formats
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+`MIPI CCS <https://www.mipi.org/specifications/camera-command-set>`_ defines a
+metadata format for sensor embedded data, which is used to store the register
+configuration used for capturing a given frame. The format is defined in the CCS
+specification. The media bus code for this format is
+``MEDIA_BUS_FMT_CCS_EMBEDDED``.
+
+The CCS embedded data format definition includes three levels:
+
+1. Padding within CSI-2 bus :ref:`Data unit <media-glossary-data-unit>` as
+ documented in the MIPI CCS specification.
+
+2. The tagged data format as documented in the MIPI CCS specification.
+
+3. Register addresses and register documentation as documented in the MIPI CCS
+ specification.
+
+The format definition shall be used only by devices that fulfill all three
+levels above.
+
+This mbus code are only used for "2-byte simplified tagged data format" (code
+0xa) but their use may be extended further in the future, to cover other CCS
+embedded data format codes.
diff --git a/include/uapi/linux/media-bus-format.h b/include/uapi/linux/media-bus-format.h
index d4c1d991014b..03f7e9ab517b 100644
--- a/include/uapi/linux/media-bus-format.h
+++ b/include/uapi/linux/media-bus-format.h
@@ -183,4 +183,7 @@
#define MEDIA_BUS_FMT_META_20 0x8006
#define MEDIA_BUS_FMT_META_24 0x8007
+/* Specific metadata formats. Next is 0x9002. */
+#define MEDIA_BUS_FMT_CCS_EMBEDDED 0x9001
+
#endif /* __LINUX_MEDIA_BUS_FORMAT_H */
--
Julien Massot
Senior Software Engineer
Collabora Ltd.
Platinum Building, St John's Innovation Park, Cambridge CB4 0DS, UK
Registered in England & Wales, no. 5513718
