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

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";

		};

	};

# 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 <animeshagarwal28@gmail.com>

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";

    };