media: i2c: Add support for the OV8865 image sensor

The OV8865 is a 8 Mpx CMOS image sensor producing 3264x2448 at 30 fps.
Other modes (including some with sub-sampling) are available too.
It outputs 10-bit bayer CFA data through a MIPI CSI-2 interface with
up to 4 lanes supported.

Some register initialisation sequences are still needed for this driver,
as they cover registers for which no documentation is available.

This work is based on the first version of the driver submitted by
Kévin L'hôpital, which was adapted to mainline from the Allwinner BSP.
This version is a rewrite of the first version that matches the structure
of the OV5648 driver, with explicit PLL configuration, all the necessary
mode-specific fields, associatied registers and reduced static sequences.

It was tested with the Banana Pi Camera Board v3 and the Banana Pi M3.

Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/Kconfig

@@ -1060,6 +1060,19 @@ config VIDEO_OV8856
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov8856.
 
+config VIDEO_OV8865
+	tristate "OmniVision OV8865 sensor support"
+	depends on I2C && PM && VIDEO_V4L2
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	select V4L2_FWNODE
+	help
+	  This is a Video4Linux2 sensor driver for OmniVision
+	  OV8865 camera sensor.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov8865.
+
 config VIDEO_OV9640
 	tristate "OmniVision OV9640 sensor support"
 	depends on I2C && VIDEO_V4L2

drivers/media/i2c/Makefile

@@ -83,6 +83,7 @@ obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
 obj-$(CONFIG_VIDEO_OV772X) += ov772x.o
 obj-$(CONFIG_VIDEO_OV7740) += ov7740.o
 obj-$(CONFIG_VIDEO_OV8856) += ov8856.o
+obj-$(CONFIG_VIDEO_OV8865) += ov8865.o
 obj-$(CONFIG_VIDEO_OV9640) += ov9640.o
 obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
 obj-$(CONFIG_VIDEO_OV9734) += ov9734.o