[PATCH v6 06/28] media: uapi: ccs: Add media bus code for MIPI CCS embedded data

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Add new MIPI CCS embedded data media bus code
(MEDIA_BUS_FMT_CCS_EMBEDDED).

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 .../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 c54bf834d839..70cad81bf862 100644
--- a/Documentation/userspace-api/media/v4l/subdev-formats.rst
+++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst
@@ -8492,3 +8492,31 @@ 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 9ee031397372..9805f8e73e48 100644
--- a/include/uapi/linux/media-bus-format.h
+++ b/include/uapi/linux/media-bus-format.h
@@ -182,4 +182,7 @@
 #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 */
-- 
2.39.2