[PATCH v6 07/28] media: Documentation: ccs: Document routing

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

Document which routes are available for the CCS driver (source) sub-device
and what configuration are possible.

Also update copyright.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 .../userspace-api/media/drivers/ccs.rst       | 34 ++++++++++++++++++-
 .../media/v4l/subdev-formats.rst              |  2 ++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst
index 161cb65f4d98..ad8615233bae 100644
--- a/Documentation/userspace-api/media/drivers/ccs.rst
+++ b/Documentation/userspace-api/media/drivers/ccs.rst
@@ -107,4 +107,36 @@ than in the centre.
 Shading correction needs to be enabled for luminance correction level to have an
 effect.
 
-**Copyright** |copy| 2020 Intel Corporation
+.. _media-ccs-routes:
+
+Routes
+------
+
+The CCS driver implements one or two :ref:`routes <subdev-routing>` in
+its source sub-device (scaler sub-device if exists for the device, otherwise
+binner) depending on whether the sensor supports embedded data. (All CCS
+compliant sensors do but the CCS driver supports preceding standards that did
+not require embedded data support, too.)
+
+The first route of the CCS source sub-device is for pixel data (internal pad
+1/stream 0 -> pad 0/stream 0) and the second one is for embedded data (internal
+pad 2/stream 0 -> pad 0/stream 1).
+
+Embedded data
+~~~~~~~~~~~~~
+
+MIPI CCS supports generation of camera sensor embedded data. The media bus code
+used for this format is :ref:`MEDIA_BUS_FMT_CCS_EMBEDDDED
+<MEDIA-BUS-FMT-CCS-EMBEDDED>`.
+
+The bit depth of the CCS pixel data affects how the sensor will output the
+embedded data, adding padding to align with CSI-2 bus :ref:`Data units
+<media-glossary-data-unit>` for that particular bit depth. This is indicated by
+the generic metadata format on the sensor's source sub-device's source pad.
+
+Embedded data for bit depths greater than or equal to 16 may support more dense
+packing or legacy single metadata byte per data unit, or both of these,
+depending on the device. The supported embedded data formats can be enumerated
+and configured on stream 1 of the source pad (1) of the CCS source sub-device.
+
+**Copyright** |copy| 2020, 2023 Intel Corporation
diff --git a/Documentation/userspace-api/media/v4l/subdev-formats.rst b/Documentation/userspace-api/media/v4l/subdev-formats.rst
index 70cad81bf862..62396a47af4d 100644
--- a/Documentation/userspace-api/media/v4l/subdev-formats.rst
+++ b/Documentation/userspace-api/media/v4l/subdev-formats.rst
@@ -8520,3 +8520,5 @@ 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.
+
+Also see :ref:`CCS driver documentation <media-ccs-routes>`.
-- 
2.39.2