dt-bindings: arm: mediatek: move ethsys controller & convert to DT schema

DT schema helps validating DTS files. Binding was moved to clock/ as
this hardware is a clock provider. Example required a small fix for
"reg" value (1 address cell + 1 size cell).
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231119212416.2682-1-zajec5@gmail.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/arm/mediatek/mediatek,ethsys.txt

-Mediatek ethsys controller
-============================
-
-The Mediatek ethsys controller provides various clocks to the system.
-
-Required Properties:
-
-- compatible: Should be:
-	- "mediatek,mt2701-ethsys", "syscon"
-	- "mediatek,mt7622-ethsys", "syscon"
-	- "mediatek,mt7623-ethsys", "mediatek,mt2701-ethsys", "syscon"
-	- "mediatek,mt7629-ethsys", "syscon"
-	- "mediatek,mt7981-ethsys", "syscon"
-	- "mediatek,mt7986-ethsys", "syscon"
-- #clock-cells: Must be 1
-- #reset-cells: Must be 1
-
-The ethsys controller uses the common clk binding from
-Documentation/devicetree/bindings/clock/clock-bindings.txt
-The available clocks are defined in dt-bindings/clock/mt*-clk.h.
-
-Example:
-
-ethsys: clock-controller@1b000000 {
-	compatible = "mediatek,mt2701-ethsys", "syscon";
-	reg = <0 0x1b000000 0 0x1000>;
-	#clock-cells = <1>;
-	#reset-cells = <1>;
-};

Documentation/devicetree/bindings/clock/mediatek,ethsys.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,ethsys.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek ethsys controller
+
+description:
+  The available clocks are defined in dt-bindings/clock/mt*-clk.h.
+
+maintainers:
+  - James Liao <jamesjj.liao@mediatek.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - mediatek,mt2701-ethsys
+              - mediatek,mt7622-ethsys
+              - mediatek,mt7629-ethsys
+              - mediatek,mt7981-ethsys
+              - mediatek,mt7986-ethsys
+          - const: syscon
+      - items:
+          - const: mediatek,mt7623-ethsys
+          - const: mediatek,mt2701-ethsys
+          - const: syscon
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - reg
+  - "#clock-cells"
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@1b000000 {
+        compatible = "mediatek,mt2701-ethsys", "syscon";
+        reg = <0x1b000000 0x1000>;
+        #clock-cells = <1>;
+        #reset-cells = <1>;
+    };