dt-bindings: arm: Convert Axis board/soc bindings to json-schema

Convert Axis SoC bindings to DT schema format using json-schema.
Existing bindings supports ARTPEC-6 SoC and board.

Signed-off-by: SungMin Park <smn1196@coasia.com>
Signed-off-by: SeonGu Kang <ksk4725@coasia.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Ravi Patel <ravi.patel@samsung.com>
Link: https://lore.kernel.org/r/20250825114436.46882-7-ravi.patel@samsung.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/arm/axis.txt

@@ -1,13 +0,0 @@
-Axis Communications AB
-ARTPEC series SoC Device Tree Bindings
-
-ARTPEC-6 ARM SoC
-================
-
-Required root node properties:
-- compatible = "axis,artpec6";
-
-ARTPEC-6 Development board:
----------------------------
-Required root node properties:
-- compatible = "axis,artpec6-dev-board", "axis,artpec6";

Documentation/devicetree/bindings/arm/axis.yaml

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/axis.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Axis ARTPEC platforms
+
+maintainers:
+  - Jesper Nilsson <jesper.nilsson@axis.com>
+  - linux-arm-kernel@axis.com
+
+description: |
+  ARM platforms using SoCs designed by Axis branded as "ARTPEC".
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+      - description: Axis ARTPEC-6 SoC board
+        items:
+          - enum:
+              - axis,artpec6-dev-board
+          - const: axis,artpec6
+
+additionalProperties: true
+
+...