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 <ychuang3@nuvoton.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 50 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-gcr.yaml b/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-gcr.yaml
new file mode 100644
index 000000000000..23e7e4ea01ff
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-gcr.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/nuvoton/nuvoton,npcm-gcr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Global Control Registers block in Nuvoton SoCs
+
+maintainers:
+  - Jonathan Neuschäfer <j.neuschaefer@gmx.net>
+  - Tomer Maimon <tmaimon77@gmail.com>
+
+description:
+  The Global Control Registers (GCR) are a block of registers in Nuvoton SoCs
+  that expose misc functionality such as chip model and version information or
+  pinmux settings.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - nuvoton,wpcm450-gcr
+          - nuvoton,npcm750-gcr
+          - nuvoton,npcm845-gcr
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties:
+  type: object
+
+examples:
+  - |
+    gcr: syscon@800000 {
+      compatible = "nuvoton,npcm750-gcr", "syscon", "simple-mfd";
+      reg = <0x800000 0x1000>;
+
+      mux-controller {
+        compatible = "mmio-mux";
+        #mux-control-cells = <1>;
+        mux-reg-masks = <0x38 0x07>;
+        idle-states = <2>;
+      };
+    };