dt-bindings: arm: sunplus: Add bindings for Sunplus SP7021 SoC boards

This introduces bindings for boards based Sunplus SP7021 SoC.

Signed-off-by: Qin Jian <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

Documentation/devicetree/bindings/arm/sunplus,sp7021.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) Sunplus Co., Ltd. 2021
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/sunplus,sp7021.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sunplus SP7021 Boards
+
+maintainers:
+  - qinjian <[e-mail]>
+
+description: |
+  ARM platforms using Sunplus SP7021, an ARM Cortex A7 (4-cores) based SoC.
+  Wiki: https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    items:
+      - enum:
+          - sunplus,sp7021-achip
+          - sunplus,sp7021-demo-v3
+      - const: sunplus,sp7021
+
+additionalProperties: true
+
+...

MAINTAINERS

···
 N:	stm32
 N:	stm
 
+ARM/SUNPLUS SP7021 SOC SUPPORT
+M:	Qin Jian <[e-mail]>
+L:	[e-mail] (moderated for mon-subscribers)
+S:	Maintained
+W:	https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview
+F:	Documentation/devicetree/bindings/arm/sunplus,sp7021.yaml
+
 ARM/Synaptics SoC support
 M:	Jisheng Zhang <[e-mail]>
 M:	Sebastian Hesselbarth <[e-mail]>