media: dt-bindings: media: rcar_vin: fix style for ports and endpoints

The style for referring to ports and endpoint are wrong. Refer to them
using lowercase and a unit address, port@x and endpoint@x.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/devicetree/bindings/media/rcar_vin.txt

@@ -45,23 +45,23 @@ The per-board settings Gen2 platforms:
 The per-board settings Gen3 platforms:
 
 Gen3 platforms can support both a single connected parallel input source
-from external SoC pins (port0) and/or multiple parallel input sources
-from local SoC CSI-2 receivers (port1) depending on SoC.
+from external SoC pins (port@0) and/or multiple parallel input sources
+from local SoC CSI-2 receivers (port@1) depending on SoC.
 
 - renesas,id - ID number of the VIN, VINx in the documentation.
 - ports
-    - port 0 - sub-node describing a single endpoint connected to the VIN
+    - port@0 - sub-node describing a single endpoint connected to the VIN
       from external SoC pins described in video-interfaces.txt[1].
-      Describing more then one endpoint in port 0 is invalid. Only VIN
-      instances that are connected to external pins should have port 0.
-    - port 1 - sub-nodes describing one or more endpoints connected to
+      Describing more than one endpoint in port@0 is invalid. Only VIN
+      instances that are connected to external pins should have port@0.
+    - port@1 - sub-nodes describing one or more endpoints connected to
       the VIN from local SoC CSI-2 receivers. The endpoint numbers must
       use the following schema.
 
-        - Endpoint 0 - sub-node describing the endpoint connected to CSI20
-        - Endpoint 1 - sub-node describing the endpoint connected to CSI21
-        - Endpoint 2 - sub-node describing the endpoint connected to CSI40
-        - Endpoint 3 - sub-node describing the endpoint connected to CSI41
+        - endpoint@0 - sub-node describing the endpoint connected to CSI20
+        - endpoint@1 - sub-node describing the endpoint connected to CSI21
+        - endpoint@2 - sub-node describing the endpoint connected to CSI40
+        - endpoint@3 - sub-node describing the endpoint connected to CSI41
 
 Device node example for Gen2 platforms
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