media: rcar-isp: Add Renesas R-Car Image Signal Processor driver

Add a V4L2 driver for Renesas R-Car Image Signal Processor. The driver
supports the R-Car V3U SoC where the ISP IP sits between the R-Car CSI-2
receiver and VIN and filters the CSI-2 data based on VC/DT and directs
the video stream to different VIN IPs.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

MAINTAINERS

@@ -11681,6 +11681,7 @@ T:	git git://linuxtv.org/media_tree.git
 F:	Documentation/devicetree/bindings/media/renesas,csi2.yaml
 F:	Documentation/devicetree/bindings/media/renesas,isp.yaml
 F:	Documentation/devicetree/bindings/media/renesas,vin.yaml
+F:	drivers/media/platform/rcar-isp.c
 F:	drivers/media/platform/rcar-vin/
 
 MEDIA DRIVERS FOR RENESAS - VSP1

drivers/media/platform/Kconfig

@@ -200,6 +200,22 @@ config VIDEO_TI_CAL_MC
 
 endif # VIDEO_TI_CAL
 
+config VIDEO_RCAR_ISP
+	tristate "R-Car Image Signal Processor (ISP)"
+	depends on VIDEO_V4L2 && OF
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	select RESET_CONTROLLER
+	select V4L2_FWNODE
+	help
+	  Support for Renesas R-Car Image Signal Processor (ISP).
+	  Enable this to support the Renesas R-Car Image Signal
+	  Processor (ISP).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rcar-isp.
+
 endif # V4L_PLATFORM_DRIVERS
 
 menuconfig V4L_MEM2MEM_DRIVERS

drivers/media/platform/Makefile

@@ -63,6 +63,7 @@ obj-$(CONFIG_VIDEO_AM437X_VPFE)		+= am437x/
 
 obj-$(CONFIG_VIDEO_XILINX)		+= xilinx/
 
+obj-$(CONFIG_VIDEO_RCAR_ISP)		+= rcar-isp.o
 obj-$(CONFIG_VIDEO_RCAR_VIN)		+= rcar-vin/
 
 obj-$(CONFIG_VIDEO_ATMEL_ISC)		+= atmel/