media: uapi: Add an entity type for Image Signal Processors

Add and document a media entity type for Image Signal Processor devices.
Surprisingly we didn't have one, so add one now. More or less all ISP
drivers should use this type instead of what they currently are using (or
not using anything).
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/userspace-api/media/mediactl/media-types.rst

@@ -39,6 +39,7 @@ Types and flags used to represent the media graph elements
 .. _MEDIA-ENT-F-PROC-VIDEO-STATISTICS:
 .. _MEDIA-ENT-F-PROC-VIDEO-ENCODER:
 .. _MEDIA-ENT-F-PROC-VIDEO-DECODER:
+.. _MEDIA-ENT-F-PROC-VIDEO-ISP:
 .. _MEDIA-ENT-F-VID-MUX:
 .. _MEDIA-ENT-F-VID-IF-BRIDGE:
 .. _MEDIA-ENT-F-DV-DECODER:
@@ -201,6 +202,12 @@ Types and flags used to represent the media graph elements
           decompressing a compressed video stream into uncompressed video
 	  frames. Must have one sink pad and at least one source pad.
 
+    *  -  ``MEDIA_ENT_F_PROC_VIDEO_ISP``
+       -  An Image Signal Processor (ISP) device. ISPs generally are one of a
+	  kind devices that have their specific control interfaces using a
+	  combination of custom V4L2 controls and IOCTLs, and parameters
+	  supplied in a metadata buffer.
+
     *  -  ``MEDIA_ENT_F_VID_MUX``
        - Video multiplexer. An entity capable of multiplexing must have at
          least two sink pads and one source pad, and must pass the video

include/uapi/linux/media.h

@@ -127,6 +127,7 @@ struct media_device_info {
 #define MEDIA_ENT_F_PROC_VIDEO_STATISTICS	(MEDIA_ENT_F_BASE + 0x4006)
 #define MEDIA_ENT_F_PROC_VIDEO_ENCODER		(MEDIA_ENT_F_BASE + 0x4007)
 #define MEDIA_ENT_F_PROC_VIDEO_DECODER		(MEDIA_ENT_F_BASE + 0x4008)
+#define MEDIA_ENT_F_PROC_VIDEO_ISP		(MEDIA_ENT_F_BASE + 0x4009)
 
 /*
  * Switch and bridge entity functions