dt-bindings: mfd: nxp: Add NXP LPC32xx System Control Block

NXP LPC32xx SoC series contains a System Control Block, which serves for
a multitude of purposes including clock and power management, DMA muxing,
storing SoC unique ID etc.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251231215754.2222308-2-vz@mleia.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/nxp,lpc3220-scb.yaml

@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/nxp,lpc3220-scb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC32xx System Control Block
+
+maintainers:
+  - Vladimir Zapolskiy <vz@mleia.com>
+
+description:
+  NXP LPC32xx SoC series have a System Control Block, which serves for
+  a multitude of purposes including clock management, DMA muxes, storing
+  SoC unique ID etc.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - nxp,lpc3220-scb
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  ranges: true
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+patternProperties:
+  "^clock-controller@[0-9a-f]+$":
+    $ref: /schemas/clock/nxp,lpc3220-clk.yaml#
+
+  "^dma-router@[0-9a-f]+$":
+    $ref: /schemas/dma/nxp,lpc3220-dmamux.yaml#
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    syscon@400040000 {
+        compatible = "nxp,lpc3220-scb", "syscon", "simple-mfd";
+        reg = <0x40004000 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0 0x40004000 0x1000>;
+
+        clock-controller@0 {
+            compatible = "nxp,lpc3220-clk";
+            reg = <0x0 0x114>;
+            clocks = <&xtal_32k>, <&xtal>;
+            clock-names = "xtal_32k", "xtal";
+            #clock-cells = <1>;
+        };
+
+        dma-router@78 {
+            compatible = "nxp,lpc3220-dmamux";
+            reg = <0x78 0x8>;
+            dma-masters = <&dma>;
+            #dma-cells = <3>;
+        };
+    };