dt-bindings: clock: nxp,lpc3220-clk: Convert bindings to DT schema

Convert the NXP LPC32xx Clock Controller bindings to yaml format.

Cc: Daniel Baluta <[e-mail]>
Signed-off-by: Animesh Agarwal <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/nxp,lpc3220-clk.txt

···
-NXP LPC32xx Clock Controller
-
-Required properties:
-- compatible: should be "nxp,lpc3220-clk"
-- reg:  should contain clock controller registers location and length
-- #clock-cells: must be 1, the cell holds id of a clock provided by the
-  clock controller
-- clocks: phandles of external oscillators, the list must contain one
-  32768 Hz oscillator and may have one optional high frequency oscillator
-- clock-names: list of external oscillator clock names, must contain
-  "xtal_32k" and may have optional "xtal"
-
-Examples:
-
-	/* System Control Block */
-	scb {
-		compatible = "simple-bus";
-		ranges = <0x0 0x040004000 0x00001000>;
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		clk: clock-controller@0 {
-			compatible = "nxp,lpc3220-clk";
-			reg = <0x00 0x114>;
-			#clock-cells = <1>;
-
-			clocks = <&xtal_32k>, <&xtal>;
-			clock-names = "xtal_32k", "xtal";
-		};
-	};

Documentation/devicetree/bindings/clock/nxp,lpc3220-clk.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/nxp,lpc3220-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC32xx Clock Controller
+
+maintainers:
+  - Animesh Agarwal <[e-mail]>
+
+properties:
+  compatible:
+    const: nxp,lpc3220-clk
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: External 32768 Hz oscillator.
+      - description: Optional high frequency oscillator.
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: xtal_32k
+      - const: xtal
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@0 {
+        compatible = "nxp,lpc3220-clk";
+        reg = <0x00 0x114>;
+        #clock-cells = <1>;
+        clocks = <&xtal_32k>, <&xtal>;
+        clock-names = "xtal_32k", "xtal";
+    };