dt-bindings: serial: Add renesas,em-uart bindings

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

%YAML 1.2

---

$id: "http://devicetree.org/schemas/serial/renesas,em-uart.yaml#"

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

title: Renesas EMMA Mobile UART Interface

maintainers:

  - Magnus Damm <magnus.damm@gmail.com>

allOf:

  - $ref: serial.yaml#

properties:

  compatible:

    const: renesas,em-uart

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

  clock-names:

    const: sclk

required:

  - compatible

  - reg

  - interrupts

  - clocks

  - clock-names

additionalProperties: false

examples:

  - |

    #include <dt-bindings/interrupt-controller/arm-gic.h>

    uart0: serial@e1020000 {

            compatible = "renesas,em-uart";

            reg = <0xe1020000 0x38>;

            interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;

            clocks = <&usia_u0_sclk>;

            clock-names = "sclk";

    };