media: v4l: Documentation: Raw Bayer formats are not RGB formats

The raw Bayer formats have been listed under the label of RGB formats but
in fact they're quite different. The latter are readily usable as such
whereas the former require quite bit of image processing before useful.

Split them into RGB and raw Bayer formats.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/media/uapi/v4l/control.rst

@@ -295,7 +295,7 @@ Control IDs
     Sets the alpha color component. When a capture device (or capture
     queue of a mem-to-mem device) produces a frame format that includes
     an alpha component (e.g.
-    :ref:`packed RGB image formats <rgb-formats>`) and the alpha value
+    :ref:`packed RGB image formats <pixfmt-rgb>`) and the alpha value
     is not defined by the device or the mem-to-mem input data this
     control lets you select the alpha component value of all pixels.
     When an output device (or output queue of a mem-to-mem device)

Documentation/media/uapi/v4l/hist-v4l2.rst

@@ -900,7 +900,7 @@ V4L2 in Linux 2.6.19
    :ref:`VIDIOC_ENUM_FRAMEINTERVALS`
    were added.
 
-3. A new pixel format ``V4L2_PIX_FMT_RGB444`` (:ref:`rgb-formats`) was
+3. A new pixel format ``V4L2_PIX_FMT_RGB444`` (:ref:`pixfmt-rgb`) was
    added.
 
 

Documentation/media/uapi/v4l/pixfmt-bayer.rst

@@ -0,0 +1,38 @@
+.. Permission is granted to copy, distribute and/or modify this
+.. document under the terms of the GNU Free Documentation License,
+.. Version 1.1 or any later version published by the Free Software
+.. Foundation, with no Invariant Sections, no Front-Cover Texts
+.. and no Back-Cover Texts. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
+..
+.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
+
+.. _pixfmt-bayer:
+
+*****************
+Raw Bayer Formats
+*****************
+
+Description
+===========
+
+The raw Bayer formats are used by image sensors before much if any processing is
+performed on the image. The formats contain green, red and blue components, with
+alternating lines of red and green, and blue and green pixels in different
+orders. See also `the Wikipedia article on Bayer filter
+<https://en.wikipedia.org/wiki/Bayer_filter>`__.
+
+
+.. toctree::
+    :maxdepth: 1
+
+    pixfmt-srggb8
+    pixfmt-srggb10
+    pixfmt-srggb10p
+    pixfmt-srggb10alaw8
+    pixfmt-srggb10dpcm8
+    pixfmt-srggb10-ipu3
+    pixfmt-srggb12
+    pixfmt-srggb12p
+    pixfmt-srggb14p
+    pixfmt-srggb16