media: hi556: Add support for Hi-556 sensor

Add a V4L2 sub-device driver for Hynix Hi-556 image sensor.
This is a camera sensor using the I2C bus for control and the
CSI-2 bus for data.

This driver supports following features:
- manual exposure and analog/digital gain control support
- vblank/hblank control support
- test pattern support
- media controller support
- runtime PM support
- support following resolutions:
  + 2592x1944 at 30FPS
  + 1296x972  at 30FPS

[sakari.ailus@linux.intel.com: Remove MEDIA_CAMERA_SUPPORT from Kconfig dependencies]
Signed-off-by: Shawn Tu <shawnx.tu@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

MAINTAINERS

@@ -7554,6 +7554,13 @@ L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	arch/x86/kernel/cpu/hygon.c
 
+HYNIX HI556 SENSOR DRIVER
+M:	Shawn Tu <shawnx.tu@intel.com>
+L:	linux-media@vger.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/i2c/hi556.c
+
 Hyper-V CORE AND DRIVERS
 M:	"K. Y. Srinivasan" <kys@microsoft.com>
 M:	Haiyang Zhang <haiyangz@microsoft.com>

drivers/media/i2c/Kconfig

@@ -568,6 +568,18 @@ config VIDEO_SMIAPP_PLL
 
 if MEDIA_CAMERA_SUPPORT
 
+config VIDEO_HI556
+	tristate "Hynix Hi-556 sensor support"
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CONTROLLER
+	select V4L2_FWNODE
+	help
+	  This is a Video4Linux2 sensor driver for the Hynix
+	  Hi-556 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called hi556.
+
 config VIDEO_IMX214
 	tristate "Sony IMX214 sensor support"
 	depends on GPIOLIB && I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API

drivers/media/i2c/Makefile

@@ -109,6 +109,7 @@ obj-$(CONFIG_VIDEO_I2C)		+= video-i2c.o
 obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
 obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
 obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
+obj-$(CONFIG_VIDEO_HI556)	+= hi556.o
 obj-$(CONFIG_VIDEO_IMX214)	+= imx214.o
 obj-$(CONFIG_VIDEO_IMX258)	+= imx258.o
 obj-$(CONFIG_VIDEO_IMX274)	+= imx274.o