dt-bindings: display: bridge: Repurpose lvds-encoder

In an effort to repurpose lvds-encoder.c to also serve the
function of LVDS decoders, we ended up defining a new "generic"
compatible string ("lvds-decoder"), therefore adapt the dt schema
to allow for the new compatible string.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[narmstrong: fixed port descriptions as acked with lpinchart]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1573660292-10629-9-git-send-email-fabrizio.castro@bp.renesas.com

Documentation/devicetree/bindings/display/bridge/lvds-transmitter.yaml → Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml

 # SPDX-License-Identifier: GPL-2.0
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/display/bridge/lvds-transmitter.yaml#
+$id: http://devicetree.org/schemas/display/bridge/lvds-codec.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Parallel to LVDS Encoder
+title: Transparent LVDS encoders and decoders
 
 maintainers:
   - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
 
 description: |
-  This binding supports the parallel to LVDS encoders that don't require any
-  configuration.
+  This binding supports transparent LVDS encoders and decoders that don't
+  require any configuration.
 
   LVDS is a physical layer specification defined in ANSI/TIA/EIA-644-A. Multiple
   incompatible data link layers have been used over time to transmit image data
@@ -33,12 +33,14 @@ properties:
     description: |
       Must list the device specific compatible string first, followed by the
       generic compatible string.
-    items:
-      - enum:
-        - ti,ds90c185       # For the TI DS90C185 FPD-Link Serializer
-        - ti,ds90c187       # For the TI DS90C187 FPD-Link Serializer
-        - ti,sn75lvds83     # For the TI SN75LVDS83 FlatLink transmitter
-      - const: lvds-encoder # Generic LVDS encoder compatible fallback
+    oneOf:
+      - items:
+        - enum:
+          - ti,ds90c185       # For the TI DS90C185 FPD-Link Serializer
+          - ti,ds90c187       # For the TI DS90C187 FPD-Link Serializer
+          - ti,sn75lvds83     # For the TI SN75LVDS83 FlatLink transmitter
+        - const: lvds-encoder # Generic LVDS encoder compatible fallback
+      - const: lvds-decoder   # Generic LVDS decoders compatible fallback
 
   ports:
     type: object
@@ -49,12 +51,14 @@ properties:
       port@0:
         type: object
         description: |
-          Port 0 is for parallel input
+          For LVDS encoders, port 0 is the parallel input
+          For LVDS decoders, port 0 is the LVDS input
 
       port@1:
         type: object
         description: |
-          Port 1 is for LVDS output
+          For LVDS encoders, port 1 is the LVDS output
+          For LVDS decoders, port 1 is the parallel output
 
     required:
       - port@0
@@ -96,4 +100,30 @@ examples:
       };
     };
 
+  - |
+    lvds-decoder {
+      compatible = "lvds-decoder";
+
+      ports {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        port@0 {
+          reg = <0>;
+
+          lvds_dec_in: endpoint {
+            remote-endpoint = <&display_out_lvds>;
+          };
+        };
+
+        port@1 {
+          reg = <1>;
+
+          lvds_dec_out: endpoint {
+            remote-endpoint = <&rgb_panel_in>;
+          };
+        };
+      };
+    };
+
 ...