dt-bindings: soc: sophgo: add TOP syscon for CV18XX/SG200X series SoC

The Sophgo CV18XX/SG200X SoC top misc system controller provides register
access to configure related modules. It includes a usb2 phy and a dma
multiplexer.

Co-developed-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Longbin Li <looong.bin@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20251101014329.18439-2-looong.bin@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>

Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml

@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/sophgo/sophgo,cv1800b-top-syscon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV18XX/SG200X SoC top system controller
+
+maintainers:
+  - Inochi Amaoto <inochiama@outlook.com>
+
+description:
+  The Sophgo CV18XX/SG200X SoC top misc system controller provides
+  register access to configure related modules.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: sophgo,cv1800b-top-syscon
+          - const: syscon
+          - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+  dma-router@154:
+    $ref: /schemas/dma/sophgo,cv1800b-dmamux.yaml#
+    unevaluatedProperties: false
+
+  phy@48:
+    $ref: /schemas/phy/sophgo,cv1800b-usb2-phy.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/sophgo,cv1800.h>
+
+    syscon@3000000 {
+      compatible = "sophgo,cv1800b-top-syscon", "syscon", "simple-mfd";
+      reg = <0x03000000 0x1000>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      phy@48 {
+        compatible = "sophgo,cv1800b-usb2-phy";
+        reg = <0x48 0x4>;
+        #phy-cells = <0>;
+        clocks = <&clk CLK_USB_125M>,
+                 <&clk CLK_USB_33K>,
+                 <&clk CLK_USB_12M>;
+        clock-names = "app", "stb", "lpm";
+        resets = <&rst 58>;
+      };
+
+      dma-router@154 {
+        compatible = "sophgo,cv1800b-dmamux";
+        reg = <0x154 0x8>, <0x298 0x4>;
+        #dma-cells = <2>;
+        dma-masters = <&dmac>;
+      };
+    };
+
+...