dt-bindings: arm: Add initial bindings for Nuvoton platform

Modify Nuvoton NPCM and MA35 platform board bindings
- Move 'nuvoton,npcm-gcr.yaml' from 'bindings/arm/npcm' to
'bindings/soc/nuvoton'.
- Rename the 'bindings/arm/npcm' directory to 'bindings/arm/nuvoton'.
- Add bindings for ARMv8-based Nuvoton SoCs and platform boards, and
include the initial bindings for ma35d1 series development boards.

Modify MAINTAINERS
- Remove the line for 'bindings/arm/npcm/' under ARM/NUVOTON NPCM, as it
has been renamed.
- Add ARM/NUVOTON MA35 for Nuvoton MA35 series SoCs maintainer and files.

Signed-off-by: Jacky Huang <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

Documentation/devicetree/bindings/arm/npcm/npcm.yaml Documentation/devicetree/bindings/arm/nuvoton/nuvoton,npcm.yaml

···
 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/arm/npcm/npcm.yaml#
+$id: http://devicetree.org/schemas/arm/nuvoton/nuvoton,npcm.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: NPCM Platforms

Documentation/devicetree/bindings/arm/npcm/nuvoton,gcr.yaml Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-gcr.yaml

···
 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/arm/npcm/nuvoton,gcr.yaml#
+$id: http://devicetree.org/schemas/soc/nuvoton/nuvoton,npcm-gcr.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Global Control Registers block in Nuvoton SoCs

Documentation/devicetree/bindings/arm/nuvoton/nuvoton,ma35d1.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/nuvoton/nuvoton,ma35d1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton MA35 series SoC based platforms
+
+maintainers:
+  - Jacky Huang <[e-mail]>
+
+description: |
+  Boards with an ARMv8 based Nuvoton MA35 series SoC shall have
+  the following properties.
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+
+      - description: MA35D1 based boards
+        items:
+          - enum:
+              - nuvoton,ma35d1-iot
+              - nuvoton,ma35d1-som
+          - const: nuvoton,ma35d1
+
+additionalProperties: true
+...

MAINTAINERS

···
 F:	drivers/rtc/rtc-pl031.c
 F:	drivers/soc/ux500/
 
+ARM/NUVOTON MA35 ARCHITECTURE
+M:	Jacky Huang <[e-mail]>
+M:	Shan-Chun Hung <[e-mail]>
+L:	[e-mail] (moderated for non-subscribers)
+S:	Supported
+F:	Documentation/devicetree/bindings/*/*/*ma35*
+F:	Documentation/devicetree/bindings/*/*ma35*
+F:	arch/arm64/boot/dts/nuvoton/*ma35*
+F:	drivers/*/*/*ma35*
+F:	drivers/*/*ma35*
+K:	ma35d1
+
 ARM/NUVOTON NPCM ARCHITECTURE
 M:	Avi Fishman <[e-mail]>
 M:	Tomer Maimon <[e-mail]>
···
 S:	Supported
 F:	Documentation/devicetree/bindings/*/*/*npcm*
 F:	Documentation/devicetree/bindings/*/*npcm*
-F:	Documentation/devicetree/bindings/arm/npcm/*
 F:	Documentation/devicetree/bindings/rtc/nuvoton,nct3018y.yaml
 F:	arch/arm/boot/dts/nuvoton-npcm*
 F:	arch/arm/mach-npcm/