media: ov5640: Add BGR888 format

Add support for BGR888 image format.

No existing media bus codes describe exactly the way data is transferred
on the CSI-2 bus. This is not a new issue, the CSI-2 YUV422 8-bit format
is described by MEDIA_BUS_FMT_UYVY8_1X16 which is an arbitrary
convention and not an exact match. Use the MEDIA_BUS_FMT_BGR888_1X24 to
follow the same convention, based on the order in which bits are
transmitted over the CSI-2 bus when producing images in RGB24 format.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov5640.c

@@ -225,6 +225,10 @@ static const struct ov5640_pixfmt {
 		.code = MEDIA_BUS_FMT_RGB565_1X16,
 		.colorspace = V4L2_COLORSPACE_SRGB,
 		.bpp = 16,
+	}, {
+		.code = MEDIA_BUS_FMT_BGR888_1X24,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.bpp = 24,
 	}, {
 		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
 		.colorspace = V4L2_COLORSPACE_SRGB,
@@ -2940,6 +2944,11 @@ static int ov5640_set_framefmt(struct ov5640_dev *sensor,
 		fmt = 0x61;
 		mux = OV5640_FMT_MUX_RGB;
 		break;
+	case MEDIA_BUS_FMT_BGR888_1X24:
+		/* BGR888: RGB */
+		fmt = 0x23;
+		mux = OV5640_FMT_MUX_RGB;
+		break;
 	case MEDIA_BUS_FMT_JPEG_1X8:
 		/* YUV422, YUYV */
 		fmt = 0x30;