ASoC: add DT bindings for Microchip S/PDIF TX Controller

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/sound/mchp,spdiftx.yaml#

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

title: Microchip S/PDIF Tx Controller Device Tree Bindings

maintainers:

  - Codrin Ciubotariu <codrin.ciubotariu@microchip.com>

description:

        The Microchip Sony/Philips Digital Interface Transmitter is a

        serial port compliant with the IEC-60958 standard.

properties:

  "#sound-dai-cells":

    const: 0

  compatible:

    const: microchip,sama7g5-spdiftx

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    items:

      - description: Peripheral Bus Clock

      - description: Generic Clock

  clock-names:

    items:

      - const: pclk

      - const: gclk

  dmas:

    description: TX DMA Channel

    maxItems: 1

  dma-names:

    const: tx

required:

  - "#sound-dai-cells"

  - compatible

  - reg

  - interrupts

  - clocks

  - clock-names

  - dmas

  - dma-names

additionalProperties: false

examples:

  - |

    #include <dt-bindings/clock/at91.h>

    #include <dt-bindings/dma/at91.h>

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

    spdiftx@e1618000 {

        #sound-dai-cells = <0>;

        compatible = "microchip,sama7g5-spdiftx";

        reg = <0xe1618000 0x4000>;

        interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;

        dmas = <&dma0 AT91_XDMAC_DT_PERID(50)>;

        dma-names = "tx";

        clocks = <&pmc PMC_TYPE_PERIPHERAL 85>, <&pmc PMC_TYPE_GCK 85>;

        clock-names = "pclk", "gclk";

        pinctrl-names = "default";

        pinctrl-0 = <&pinctrl_spdiftx_default>;

    };