dt-bindings: net: dsa: mediatek,mt7530: make trivial changes

Make trivial changes on the binding.

- Update title to include MT7531 switch.
- Add me as a maintainer. List maintainers in alphabetical order by first
name.
- Add description to compatible strings.
- Stretch descriptions up to the 80 character limit.
- Remove lists for single items.
- Remove requiring reg as it's already required by dsa-port.yaml.
- Define acceptable reg values for the CPU ports.
- Remove quotes from $ref: "dsa.yaml#".

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml

@@ -4,12 +4,13 @@
 $id: http://devicetree.org/schemas/net/dsa/mediatek,mt7530.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Mediatek MT7530 Ethernet switch
+title: Mediatek MT7530 and MT7531 Ethernet Switches
 
 maintainers:
-  - Sean Wang <sean.wang@mediatek.com>
+  - Arınç ÜNAL <arinc.unal@arinc9.com>
   - Landen Chao <Landen.Chao@mediatek.com>
   - DENG Qingfang <dqfext@gmail.com>
+  - Sean Wang <sean.wang@mediatek.com>
 
 description: |
   Port 5 of mt7530 and mt7621 switch is muxed between:
@@ -61,10 +62,18 @@ description: |
 
 properties:
   compatible:
-    enum:
-      - mediatek,mt7530
-      - mediatek,mt7531
-      - mediatek,mt7621
+    oneOf:
+      - description:
+          Standalone MT7530 and multi-chip module MT7530 in MT7623AI SoC
+        const: mediatek,mt7530
+
+      - description:
+          Standalone MT7531
+        const: mediatek,mt7531
+
+      - description:
+          Multi-chip module MT7530 in MT7621AT, MT7621DAT and MT7621ST SoCs
+        const: mediatek,mt7621
 
   reg:
     maxItems: 1
@@ -79,7 +88,7 @@ properties:
   gpio-controller:
     type: boolean
     description:
-      if defined, MT7530's LED controller will run on GPIO mode.
+      If defined, MT7530's LED controller will run on GPIO mode.
 
   "#interrupt-cells":
     const: 1
@@ -92,8 +101,8 @@ properties:
   io-supply:
     description:
       Phandle to the regulator node necessary for the I/O power.
-      See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt
-      for details for the regulator setup on these boards.
+      See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt for
+      details for the regulator setup on these boards.
 
   mediatek,mcm:
     type: boolean
@@ -110,8 +119,8 @@ properties:
 
   resets:
     description:
-      Phandle pointing to the system reset controller with line index for
-      the ethsys.
+      Phandle pointing to the system reset controller with line index for the
+      ethsys.
     maxItems: 1
 
 patternProperties:
@@ -128,27 +137,31 @@ patternProperties:
         properties:
           reg:
             description:
-              Port address described must be 5 or 6 for CPU port and from 0
-              to 5 for user ports.
+              Port address described must be 5 or 6 for CPU port and from 0 to 5
+              for user ports.
 
         allOf:
           - $ref: dsa-port.yaml#
           - if:
               properties:
                 label:
-                  items:
-                    - const: cpu
+                  const: cpu
             then:
               required:
-                - reg
                 - phy-mode
 
+              properties:
+                reg:
+                  enum:
+                    - 5
+                    - 6
+
 required:
   - compatible
   - reg
 
 allOf:
-  - $ref: "dsa.yaml#"
+  - $ref: dsa.yaml#
   - if:
       required:
         - mediatek,mcm
@@ -163,8 +176,7 @@ allOf:
   - if:
       properties:
         compatible:
-          items:
-            - const: mediatek,mt7530
+          const: mediatek,mt7530
     then:
       required:
         - core-supply