[PATCH v2 15/19] media: v4l2: Add 10-, 12- and 16-bpc BGR formats

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Add three new pixel formats that store RGB data in BGR order with 10, 12
and 16 bits per component. They are used by the Xilinx Video Frame
Buffer Read/Write IP cores.

The nomenclature for these new formats follows the 8- and 16-bpp RGB
formats and the DRM format naming conventions, which differs from the
24- and 32-bpp RGB formats in V4L2.

As the number of bits per pixel grows quite large, a table with one
column per bit would be difficult to read. These formats are thus
described with one column per byte.

Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
Changes since v1:

- Interleave component names and number of bits
---
 .../userspace-api/media/v4l/pixfmt-rgb.rst    | 69 +++++++++++++++++++
 include/uapi/linux/videodev2.h                |  5 ++
 2 files changed, 74 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
index 405d6f032078..846d307624fc 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-rgb.rst
@@ -1079,6 +1079,75 @@ order of components as seen in a 24- or 32-bit little endian word.
     \endgroup
 
 
+More Than 8 Bits Per Component
+==============================
+
+These formats store an RGB triplet in four bytes or more. Similarly to the 8-
+and 16-bpp formats, they are named based on the order of the RGB components as
+seen in a word, which is then stored in memory in little endian byte order, and
+on the number of bits for each component. The component names and the
+corresponding number of bits are interleaved for clarity.
+
+.. raw:: latex
+
+    \begingroup
+    \tiny
+    \setlength{\tabcolsep}{2pt}
+
+.. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|p{2.0cm}|
+
+
+.. flat-table:: RGB Formats With More Than 8 Bits Per Component
+    :stub-columns: 0
+
+    * - Identifier
+      - Code
+      - Byte 0 in memory
+      - Byte 1
+      - Byte 2
+      - Byte 3
+      - Byte 4
+      - Byte 5
+    * .. _V4L2-PIX-FMT-X2B10G10R10:
+
+      - ``V4L2_PIX_FMT_X2B10G10R10``
+      - 'XB30'
+
+      - R\ :sub:`7-0`
+      - G\ :sub:`5-0` R\ :sub:`9-8`
+      - B\ :sub:`3-0` G\ :sub:`9-6`
+      - `-`\ :sub:`1-0` B\ :sub:`9-4`
+
+      -
+    * .. _V4L2-PIX-FMT-X4B12G12R12:
+
+      - ``V4L2_PIX_FMT_X4B12G12R12``
+      - 'XB36'
+
+      - R\ :sub:`7-0`
+      - G\ :sub:`3-0` R\ :sub:`11-8`
+      - G\ :sub:`11-4`
+      - B\ :sub:`7-0`
+      - `-`\ :sub:`3-0` B\ :sub:`11-8`
+
+      -
+    * .. _V4L2-PIX-FMT-B16G16R16:
+
+      - ``V4L2_PIX_FMT_B16G16R16``
+      - 'XB48'
+
+      - R\ :sub:`7-0`
+      - R\ :sub:`15-8`
+      - G\ :sub:`7-0`
+      - G\ :sub:`15-8`
+      - B\ :sub:`7-0`
+      - B\ :sub:`15-8`
+
+.. raw:: latex
+
+    \endgroup
+
+
 Deprecated RGB Formats
 ======================
 
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 54b9fe3b7636..fab1dbb1a618 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -558,6 +558,11 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_ARGB32  v4l2_fourcc('B', 'A', '2', '4') /* 32  ARGB-8-8-8-8  */
 #define V4L2_PIX_FMT_XRGB32  v4l2_fourcc('B', 'X', '2', '4') /* 32  XRGB-8-8-8-8  */
 
+/* RGB formats (more than 8 bits per component) */
+#define V4L2_PIX_FMT_X2B10G10R10 v4l2_fourcc('X', 'B', '3', '0') /* 32  XBGR-2-10-10-10 */
+#define V4L2_PIX_FMT_X4B12G12R12 v4l2_fourcc('X', 'B', '3', '6') /* 40  XBGR-4-12-12-12 */
+#define V4L2_PIX_FMT_B16G16R16 v4l2_fourcc('X', 'B', '4', '8') /* 48  BGR-16-16-16 */
+
 /* Grey formats */
 #define V4L2_PIX_FMT_GREY    v4l2_fourcc('G', 'R', 'E', 'Y') /*  8  Greyscale     */
 #define V4L2_PIX_FMT_Y4      v4l2_fourcc('Y', '0', '4', ' ') /*  4  Greyscale     */
-- 
Regards,

Laurent Pinchart




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