media: i2c: imx678: Add driver for Sony IMX678

Add a V4L2 subdev driver for the Sony IMX678 image sensor.

IMX678 is a diagonal 8.86 mm (Type 1/1.8) CMOS active pixel type
solid-state image sensor with a square pixel array and 8.40 M effective
pixels.

The following features are supported by this driver:
- MIPI RAW12 output
- Monochrome and Color (Bayer filter) variants
- Multiple input clock frequencies
- Multiple link frequencies
- VBLANK and HBLANK control for variable framerate
- VFLIP and HFLIP control for flipping readout
- Exposure and analogue gain control
- Test pattern control

Following features are not currently supported:
- MIPI RAW10 output
- Pixel-perfect crop reporting, accounting for the shift-by-1 when
  doing HFLIP/VFLIP where the sensor maintains RGGB bayer ordering

Along with the ones below which depend on the new raw sensor model:
- Embedded data stream
- Freely configurable cropping
- Increased framerate when cropping
- 2x2 binning support

Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Reviewed-by: Tarang Raval <tarang.raval@siliconsignals.io>
[Sakari Ailus: Add an extra newline to the enum_mbus_code op.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

MAINTAINERS

@@ -25271,6 +25271,7 @@ M:	Jai Luthra <jai.luthra@ideasonboard.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/media/i2c/sony,imx678.yaml
+F:	drivers/media/i2c/imx678.c
 
 SONY MEMORYSTICK SUBSYSTEM
 M:	Maxim Levitsky <maximlevitsky@gmail.com>

drivers/media/i2c/Kconfig

@@ -297,6 +297,17 @@ config VIDEO_IMX471
 	  To compile this driver as a module, choose M here: the
 	  module will be called imx471.
 
+config VIDEO_IMX678
+	tristate "Sony IMX678 sensor support"
+	depends on GPIOLIB
+	select V4L2_CCI_I2C
+	help
+	  This is a Video4Linux2 sensor driver for the Sony
+	  IMX678 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imx678.
+
 config VIDEO_MAX9271_LIB
 	tristate
 

drivers/media/i2c/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_VIDEO_IMX335) += imx335.o
 obj-$(CONFIG_VIDEO_IMX355) += imx355.o
 obj-$(CONFIG_VIDEO_IMX412) += imx412.o
 obj-$(CONFIG_VIDEO_IMX415) += imx415.o
+obj-$(CONFIG_VIDEO_IMX678) += imx678.o
 obj-$(CONFIG_VIDEO_IMX471) += imx471.o
 obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o
 obj-$(CONFIG_VIDEO_ISL7998X) += isl7998x.o