ASoC: dt-bindings: stm32: convert spdfirx to json-schema

STMicroelectronics STM32 S/PDIF receiver (SPDIFRX).

The SPDIFRX peripheral, is designed to receive an S/PDIF flow compliant with

IEC-60958 and IEC-61937.

Required properties:

  - compatible: should be "st,stm32h7-spdifrx"

  - reg: cpu DAI IP base address and size

  - clocks: must contain an entry for kclk (used as S/PDIF signal reference)

  - clock-names: must contain "kclk"

  - interrupts: cpu DAI interrupt line

  - dmas: DMA specifiers for audio data DMA and iec control flow DMA

    See STM32 DMA bindings, Documentation/devicetree/bindings/dma/stm32-dma.txt

  - dma-names: two dmas have to be defined, "rx" and "rx-ctrl"

Optional properties:

  - resets: Reference to a reset controller asserting the SPDIFRX

The device node should contain one 'port' child node with one child 'endpoint'

node, according to the bindings defined in Documentation/devicetree/bindings/

graph.txt.

Example:

spdifrx: spdifrx@40004000 {

	compatible = "st,stm32h7-spdifrx";

	reg = <0x40004000 0x400>;

	clocks = <&rcc SPDIFRX_CK>;

	clock-names = "kclk";

	interrupts = <97>;

	dmas = <&dmamux1 2 93 0x400 0x0>,

	       <&dmamux1 3 94 0x400 0x0>;

	dma-names = "rx", "rx-ctrl";

	pinctrl-0 = <&spdifrx_pins>;

	pinctrl-names = "default";

	spdifrx_port: port {

		cpu_endpoint: endpoint {

			remote-endpoint = <&codec_endpoint>;

		};

	};

};

spdif_in: spdif-in {

	compatible = "linux,spdif-dir";

	codec_port: port {

		codec_endpoint: endpoint {

			remote-endpoint = <&cpu_endpoint>;

		};

	};

};

soundcard {

	compatible = "audio-graph-card";

	dais = <&spdifrx_port>;

};

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

%YAML 1.2

---

$id: http://devicetree.org/schemas/sound/st,stm32-spdifrx.yaml#

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

title: STMicroelectronics STM32 S/PDIF receiver (SPDIFRX)

maintainers:

  - Olivier Moysan <olivier.moysan@st.com>

description: |

  The SPDIFRX peripheral, is designed to receive an S/PDIF flow compliant with

  IEC-60958 and IEC-61937.

properties:

  compatible:

    enum:

      - st,stm32h7-spdifrx

  "#sound-dai-cells":

    const: 0

  reg:

    maxItems: 1

  clocks:

    maxItems: 1

  clock-names:

    items:

      - const: kclk

  interrupts:

    maxItems: 1

  dmas:

    items:

      - description: audio data capture DMA

      - description: IEC status bits capture DMA

  dma-names:

    items:

      - const: rx

      - const: rx-ctrl

  resets:

    maxItems: 1

required:

  - compatible

  - "#sound-dai-cells"

  - reg

  - clocks

  - clock-names

  - interrupts

  - dmas

  - dma-names

additionalProperties: false

examples:

  - |

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

    #include <dt-bindings/clock/stm32mp1-clks.h>

    spdifrx: spdifrx@40004000 {

        compatible = "st,stm32h7-spdifrx";

        #sound-dai-cells = <0>;

        reg = <0x40004000 0x400>;

        clocks = <&rcc SPDIF_K>;

        clock-names = "kclk";

        interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;

        dmas = <&dmamux1 2 93 0x400 0x0>,

               <&dmamux1 3 94 0x400 0x0>;

        dma-names = "rx", "rx-ctrl";

        pinctrl-0 = <&spdifrx_pins>;

        pinctrl-names = "default";

    };

...