drivers: video: allow to specify individual ep with ID >= 0

This define the enum values so that they never clash with custom
endpoint IDs passed numerically, for devices that supports more
than one IN or OUT enpoint.

This also documents semantics for VIDEO_EP_IN/OUT/ALL/NONE,
while renaming VIDEO_EP_ANY to VIDEO_EP_ALL to remove the
ambiguity when there are several IN and/or OUT endpoints.

Signed-off-by: Josuah Demangeon <[email protected]>

Author: josuah

include/zephyr/drivers/video.h

@@ -124,10 +124,14 @@ struct video_buffer {
  * Identify the video device endpoint.
  */
 enum video_endpoint_id {
-	VIDEO_EP_NONE,
-	VIDEO_EP_ANY,
-	VIDEO_EP_IN,
-	VIDEO_EP_OUT,
+	/** Targets some part of the video device not bound to an endpoint */
+	VIDEO_EP_NONE = -1,
+	/** Targets all input or output endpoints of the device */
+	VIDEO_EP_ALL = -2,
+	/** Targets all input endpoints of the device: those consuming data */
+	VIDEO_EP_IN = -3,
+	/** Targets all output endpoints of the device: those producing data */
+	VIDEO_EP_OUT = -4,
 };
 
 /**
@@ -449,7 +453,7 @@ static inline int video_stream_stop(const struct device *dev)
 	}
 
 	ret = api->stream_stop(dev);
-	video_flush(dev, VIDEO_EP_ANY, true);
+	video_flush(dev, VIDEO_EP_ALL, true);
 
 	return ret;
 }