dt-bindings: arm: mediatek: topckgen: Convert to DT schema

Convert topckgen bindings to DT schema format. MT2701, MT7623 and
MT7629 device trees currently have the syscon compatible without
it being mentioned in the old DT bindings file which introduces
dtbs_check errors when converting to DT schema as-is, so
mediatek,mt2701-topckgen and mediatek,mt7629-topckgen are placed
in the last items list with the syscon compatible, and syscon is
added to the mediatek,mt7623-topckgen list.
Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220424084647.76577-2-y.oudjana@protonmail.com

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

-Mediatek topckgen controller
-============================
-
-The Mediatek topckgen controller provides various clocks to the system.
-
-Required Properties:
-
-- compatible: Should be one of:
-	- "mediatek,mt2701-topckgen"
-	- "mediatek,mt2712-topckgen", "syscon"
-	- "mediatek,mt6765-topckgen", "syscon"
-	- "mediatek,mt6779-topckgen", "syscon"
-	- "mediatek,mt6797-topckgen"
-	- "mediatek,mt7622-topckgen"
-	- "mediatek,mt7623-topckgen", "mediatek,mt2701-topckgen"
-	- "mediatek,mt7629-topckgen"
-	- "mediatek,mt7986-topckgen", "syscon"
-	- "mediatek,mt8135-topckgen"
-	- "mediatek,mt8167-topckgen", "syscon"
-	- "mediatek,mt8173-topckgen"
-	- "mediatek,mt8183-topckgen", "syscon"
-	- "mediatek,mt8516-topckgen"
-- #clock-cells: Must be 1
-
-The topckgen 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:
-
-topckgen: power-controller@10000000 {
-	compatible = "mediatek,mt8173-topckgen";
-	reg = <0 0x10000000 0 0x1000>;
-	#clock-cells = <1>;
-};

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

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/clock/mediatek,topckgen.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: MediaTek Top Clock Generator Controller
+
+maintainers:
+  - Michael Turquette <mturquette@baylibre.com>
+  - Stephen Boyd <sboyd@kernel.org>
+
+description:
+  The Mediatek topckgen controller provides various clocks to the system.
+  The clock values can be found in <dt-bindings/clock/mt*-clk.h>.
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - mediatek,mt6797-topckgen
+          - mediatek,mt7622-topckgen
+          - mediatek,mt8135-topckgen
+          - mediatek,mt8173-topckgen
+          - mediatek,mt8516-topckgen
+      - items:
+          - const: mediatek,mt7623-topckgen
+          - const: mediatek,mt2701-topckgen
+          - const: syscon
+      - items:
+          - enum:
+              - mediatek,mt2701-topckgen
+              - mediatek,mt2712-topckgen
+              - mediatek,mt6765-topckgen
+              - mediatek,mt6779-topckgen
+              - mediatek,mt7629-topckgen
+              - mediatek,mt7986-topckgen
+              - mediatek,mt8167-topckgen
+              - mediatek,mt8183-topckgen
+          - const: syscon
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    topckgen: clock-controller@10000000 {
+        compatible = "mediatek,mt8173-topckgen";
+        reg = <0x10000000 0x1000>;
+        #clock-cells = <1>;
+    };