media: i2c: Add driver for THine THP7312

The THP7312 is an external camera ISP from THine. Add a V4L2 subdev
driver for it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Co-developed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[Sakari Ailus: squash a patch to fix missing mutex_unlock by Laurent.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

MAINTAINERS

@@ -21671,6 +21671,7 @@ S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
 F:	Documentation/devicetree/bindings/media/i2c/thine,thp7312.yaml
 F:	Documentation/userspace-api/media/drivers/thp7312.rst
+F:	drivers/media/i2c/thp7312.c
 F:	include/uapi/linux/thp7312.h
 
 THUNDERBOLT DMA TRAFFIC TEST DRIVER

drivers/media/i2c/Kconfig

@@ -638,6 +638,22 @@ source "drivers/media/i2c/et8ek8/Kconfig"
 
 endif
 
+menu "Camera ISPs"
+	visible if MEDIA_CAMERA_SUPPORT
+
+config VIDEO_THP7312
+	tristate "THine THP7312 support"
+	depends on I2C
+	select MEDIA_CONTROLLER
+	select V4L2_CCI_I2C
+	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	help
+	  This is a Video4Linux2 sensor-level driver for the THine
+	  THP7312 ISP.
+
+endmenu
+
 menu "Lens drivers"
 	visible if MEDIA_CAMERA_SUPPORT
 

drivers/media/i2c/Makefile

@@ -129,6 +129,7 @@ obj-$(CONFIG_VIDEO_TDA7432) += tda7432.o
 obj-$(CONFIG_VIDEO_TDA9840) += tda9840.o
 obj-$(CONFIG_VIDEO_TEA6415C) += tea6415c.o
 obj-$(CONFIG_VIDEO_TEA6420) += tea6420.o
+obj-$(CONFIG_VIDEO_THP7312) += thp7312.o
 obj-$(CONFIG_VIDEO_THS7303) += ths7303.o
 obj-$(CONFIG_VIDEO_THS8200) += ths8200.o
 obj-$(CONFIG_VIDEO_TLV320AIC23B) += tlv320aic23b.o