media: Add a pixel format for MIPI packed 14bit luma only.

This is the format used by monochrome 14bit image sensors.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Documentation/userspace-api/media/v4l/pixfmt-y14p.rst

@@ -0,0 +1,54 @@
+.. 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
+
+.. _V4L2-PIX-FMT-Y14P:
+
+**************************
+V4L2_PIX_FMT_Y14P ('Y14P')
+**************************
+
+Grey-scale image as a MIPI RAW14 packed array
+
+
+Description
+===========
+
+This is a packed grey-scale image format with a depth of 14 bits per
+pixel. Every four consecutive samples are packed into seven bytes. Each
+of the first four bytes contain the eight high order bits of the pixels,
+and the three following bytes contains the six least significants bits of
+each pixel, in the same order.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. tabularcolumns:: |p{1.8cm}|p{1.0cm}|p{1.0cm}|p{1.0cm}|p{1.1cm}|p{3.3cm}|p{3.3cm}|p{3.3cm}|
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       2 1 1 1 1 3 3 3
+
+
+    -  -  start + 0:
+       -  Y'\ :sub:`00high`
+       -  Y'\ :sub:`01high`
+       -  Y'\ :sub:`02high`
+       -  Y'\ :sub:`03high`
+       -  Y'\ :sub:`01low bits 1--0`\ (bits 7--6)
+
+	  Y'\ :sub:`00low bits 5--0`\ (bits 5--0)
+
+       -  Y'\ :sub:`02low bits 3--0`\ (bits 7--4)
+
+	  Y'\ :sub:`01low bits 5--2`\ (bits 3--0)
+
+       -  Y'\ :sub:`03low bits 5--0`\ (bits 7--2)
+
+	  Y'\ :sub:`02low bits 5--4`\ (bits 1--0)

Documentation/userspace-api/media/v4l/yuv-formats.rst

@@ -268,6 +268,7 @@ image.
     pixfmt-yuv-planar
     pixfmt-yuv-luma
     pixfmt-y12p
+    pixfmt-y14p
     pixfmt-y8i
     pixfmt-y12i
     pixfmt-uv8

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -1270,6 +1270,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 	case V4L2_PIX_FMT_Y10BPACK:	descr = "10-bit Greyscale (Packed)"; break;
 	case V4L2_PIX_FMT_Y10P:		descr = "10-bit Greyscale (MIPI Packed)"; break;
 	case V4L2_PIX_FMT_Y12P:		descr = "12-bit Greyscale (MIPI Packed)"; break;
+	case V4L2_PIX_FMT_Y14P:		descr = "14-bit Greyscale (MIPI Packed)"; break;
 	case V4L2_PIX_FMT_IPU3_Y10:	descr = "10-bit greyscale (IPU3 Packed)"; break;
 	case V4L2_PIX_FMT_Y8I:		descr = "Interleaved 8-bit Greyscale"; break;
 	case V4L2_PIX_FMT_Y12I:		descr = "Interleaved 12-bit Greyscale"; break;

include/uapi/linux/videodev2.h

@@ -575,6 +575,7 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_Y10BPACK    v4l2_fourcc('Y', '1', '0', 'B') /* 10  Greyscale bit-packed */
 #define V4L2_PIX_FMT_Y10P    v4l2_fourcc('Y', '1', '0', 'P') /* 10  Greyscale, MIPI RAW10 packed */
 #define V4L2_PIX_FMT_Y12P    v4l2_fourcc('Y', '1', '2', 'P') /* 12  Greyscale, MIPI RAW12 packed */
+#define V4L2_PIX_FMT_Y14P    v4l2_fourcc('Y', '1', '4', 'P') /* 14  Greyscale, MIPI RAW12 packed */
 #define V4L2_PIX_FMT_IPU3_Y10		v4l2_fourcc('i', 'p', '3', 'y') /* IPU3 packed 10-bit greyscale */
 
 /* Palette formats */