[media] v4l: Add V4L2_SEL_TGT_NATIVE_SIZE selection target

The V4L2_SEL_TGT_NATIVE_SIZE target is used to denote e.g. the size of a
sensor's pixel array.
Signed-off-by: NSakari Ailus <sakari.ailus@iki.fi>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/DocBook/media/v4l/selections-common.xml

@@ -62,6 +62,22 @@
 	    <entry>Yes</entry>
 	    <entry>Yes</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_SEL_TGT_NATIVE_SIZE</constant></entry>
+	    <entry>0x0003</entry>
+	    <entry>The native size of the device, e.g. a sensor's
+	    pixel array. <structfield>left</structfield> and
+	    <structfield>top</structfield> fields are zero for this
+	    target. Setting the native size will generally only make
+	    sense for memory to memory devices where the software can
+	    create a canvas of a given size in which for example a
+	    video frame can be composed. In that case
+	    V4L2_SEL_TGT_NATIVE_SIZE can be used to configure the size
+	    of that canvas.
+	    </entry>
+	    <entry>Yes</entry>
+	    <entry>Yes</entry>
+	  </row>
 	  <row>
 	    <entry><constant>V4L2_SEL_TGT_COMPOSE</constant></entry>
 	    <entry>0x0100</entry>

include/uapi/linux/v4l2-common.h

@@ -43,6 +43,8 @@
 #define V4L2_SEL_TGT_CROP_DEFAULT	0x0001
 /* Cropping bounds */
 #define V4L2_SEL_TGT_CROP_BOUNDS	0x0002
+/* Native frame size */
+#define V4L2_SEL_TGT_NATIVE_SIZE	0x0003
 /* Current composing area */
 #define V4L2_SEL_TGT_COMPOSE		0x0100
 /* Default composing area */