dt-bindings: serial: qcom,msm-uart: Convert to DT schema

* MSM Serial UART

The MSM serial UART hardware is designed for low-speed use cases where a

dma-engine isn't needed. From a software perspective it's mostly compatible

with the MSM serial UARTDM except that it only supports reading and writing one

character at a time.

Required properties:

- compatible: Should contain "qcom,msm-uart"

- reg: Should contain UART register location and length.

- interrupts: Should contain UART interrupt.

- clocks: Should contain the core clock.

- clock-names: Should be "core".

Example:

A uart device at 0xa9c00000 with interrupt 11.

serial@a9c00000 {

	compatible = "qcom,msm-uart";

	reg = <0xa9c00000 0x1000>;

	interrupts = <11>;

	clocks = <&uart_cxc>;

	clock-names = "core";

};

# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause

%YAML 1.2

---

$id: http://devicetree.org/schemas/serial/qcom,msm-uart.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Qualcomm MSM SoC Serial UART

maintainers:

  - Bjorn Andersson <andersson@kernel.org>

  - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

description:

  The MSM serial UART hardware is designed for low-speed use cases where a

  dma-engine isn't needed. From a software perspective it's mostly compatible

  with the MSM serial UARTDM except that it only supports reading and writing

  one character at a time.

properties:

  compatible:

    const: qcom,msm-uart

  clocks:

    maxItems: 1

  clock-names:

    items:

      - const: core

  interrupts:

    maxItems: 1

  reg:

    maxItems: 1

required:

  - compatible

  - clock-names

  - clocks

  - interrupts

  - reg

unevaluatedProperties: false

allOf:

  - $ref: /schemas/serial/serial.yaml#

examples:

  - |

    serial@a9c00000 {

        compatible = "qcom,msm-uart";

        reg = <0xa9c00000 0x1000>;

        interrupts = <11>;

        clocks = <&uart_cxc>;

        clock-names = "core";

    };