[media] media-entity.h: get rid of revision and group_id fields

Both revision and group_id fields were never used and were always
initialized to zero. Remove them.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml

@@ -59,15 +59,6 @@
     <para>Entity IDs can be non-contiguous. Applications must
     <emphasis>not</emphasis> try to enumerate entities by calling
     MEDIA_IOC_ENUM_ENTITIES with increasing id's until they get an error.</para>
-    <para>Two or more entities that share a common non-zero
-    <structfield>group_id</structfield> value are considered as logically
-    grouped. Groups are used to report
-    <itemizedlist>
-      <listitem><para>ALSA, VBI and video nodes that carry the same media
-      stream</para></listitem>
-      <listitem><para>lens and flash controllers associated with a sensor</para></listitem>
-    </itemizedlist>
-    </para>
 
     <table pgwide="1" frame="none" id="media-entity-desc">
       <title>struct <structname>media_entity_desc</structname></title>
@@ -106,7 +97,7 @@
 	    <entry><structfield>revision</structfield></entry>
 	    <entry></entry>
 	    <entry></entry>
-	    <entry>Entity revision in a driver/hardware specific format.</entry>
+	    <entry>Entity revision. Always zero (obsolete)</entry>
 	  </row>
 	  <row>
 	    <entry>__u32</entry>
@@ -120,7 +111,7 @@
 	    <entry><structfield>group_id</structfield></entry>
 	    <entry></entry>
 	    <entry></entry>
-	    <entry>Entity group ID</entry>
+	    <entry>Entity group ID. Always zero (obsolete)</entry>
 	  </row>
 	  <row>
 	    <entry>__u16</entry>

Documentation/media-framework.txt

@@ -110,10 +110,10 @@ If no pads are needed, drivers could directly fill entity->num_pads
 with 0 and entity->pads with NULL or to call the above function that
 will do the same.
 
-The media_entity name, type, flags, revision and group_id fields should be
+The media_entity name, type and flags fields should be initialized before
-initialized before calling media_device_register_entity(). Entities embedded
+calling media_device_register_entity(). Entities embedded in higher-level
-in higher-level standard structures can have some of those fields set by the
+standard structures can have some of those fields set by the higher-level
-higher-level framework.
+framework.
 
 As the number of pads is known in advance, the pads array is not allocated
 dynamically but is managed by the entity driver. Most drivers will embed the
@@ -164,9 +164,7 @@ Entities have flags that describe the entity capabilities and state.
 
 Logical entity groups can be defined by setting the group ID of all member
 entities to the same non-zero value. An entity group serves no purpose in the
-kernel, but is reported to userspace during entities enumeration. The group_id
+kernel, but is reported to userspace during entities enumeration.
-field belongs to the media device driver and must not by touched by entity
-drivers.
 
 Media device drivers should define groups if several entities are logically
 bound together. Example usages include reporting

drivers/media/media-device.c

@@ -109,9 +109,9 @@ static long media_device_enum_entities(struct media_device *mdev,
 	if (ent->name)
 		strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
 	u_ent.type = ent->function;
-	u_ent.revision = ent->revision;
+	u_ent.revision = 0;		/* Unused */
 	u_ent.flags = ent->flags;
-	u_ent.group_id = ent->group_id;
+	u_ent.group_id = 0;		/* Unused */
 	u_ent.pads = ent->num_pads;
 	u_ent.links = ent->num_links - ent->num_backlinks;
 	memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));

include/media/media-entity.h

@@ -153,9 +153,7 @@ struct media_entity_operations {
  * @name:	Entity name.
  * @function:	Entity main function, as defined in uapi/media.h
  *		(MEDIA_ENT_F_*)
- * @revision:	Entity revision - OBSOLETE - should be removed soon.
  * @flags:	Entity flags, as defined in uapi/media.h (MEDIA_ENT_FL_*)
- * @group_id:	Entity group ID - OBSOLETE - should be removed soon.
  * @num_pads:	Number of sink and source pads.
  * @num_links:	Total number of links, forward and back, enabled and disabled.
  * @num_backlinks: Number of backlinks
@@ -180,9 +178,7 @@ struct media_entity {
 	struct media_gobj graph_obj;	/* must be first field in struct */
 	const char *name;
 	u32 function;
-	u32 revision;
 	unsigned long flags;
-	u32 group_id;
 
 	u16 num_pads;
 	u16 num_links;