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-rw-r--r--include/uapi/linux/media.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index c9314645d933..43109445d126 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -42,6 +42,14 @@ struct media_device_info {
#define MEDIA_ENT_ID_FLAG_NEXT (1 << 31)
+/* Used values for media_entity_desc::type */
+
+/*
+ * Initial value to be used when a new entity is created
+ * Drivers should change it to something useful
+ */
+#define MEDIA_ENT_T_UNKNOWN 0x00000000
+
/*
* Base numbers for entity types
*
@@ -76,6 +84,12 @@ struct media_device_info {
/* V4L2 Sub-device entities */
+/*
+ * Subdevs are initialized with MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN,
+ * in order to preserve backward compatibility.
+ * Drivers should change to the proper subdev type before
+ * registering the entity.
+ */
#define MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN MEDIA_ENT_T_V4L2_SUBDEV_BASE
#define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR (MEDIA_ENT_T_V4L2_SUBDEV_BASE + 1)
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