ASoC: dt-bindings: xlnx,spdif: Convert to json-schema

Convert the Xilinx SPDIF 2.0 device tree binding documentation to
json-schema.

Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Vincenzo Frascino <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/xlnx,spdif.txt

···
-Device-Tree bindings for Xilinx SPDIF IP
-
-The IP supports playback and capture of SPDIF audio
-
-Required properties:
- - compatible: "xlnx,spdif-2.0"
- - clock-names: List of input clocks.
-   Required elements: "s_axi_aclk", "aud_clk_i"
- - clocks: Input clock specifier. Refer to common clock bindings.
- - reg: Base address and address length of the IP core instance.
- - interrupts-parent: Phandle for interrupt controller.
- - interrupts: List of Interrupt numbers.
- - xlnx,spdif-mode: 0 :- receiver mode
-		    1 :- transmitter mode
- - xlnx,aud_clk_i: input audio clock value.
-
-Example:
-	spdif_0: spdif@80010000 {
-		clock-names = "aud_clk_i", "s_axi_aclk";
-		clocks = <&misc_clk_0>, <&clk 71>;
-		compatible = "xlnx,spdif-2.0";
-		interrupt-names = "spdif_interrupt";
-		interrupt-parent = <&gic>;
-		interrupts = <0 91 4>;
-		reg = <0x0 0x80010000 0x0 0x10000>;
-		xlnx,spdif-mode = <1>;
-		xlnx,aud_clk_i = <49152913>;
-	};

Documentation/devicetree/bindings/sound/xlnx,spdif.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/xlnx,spdif.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx SPDIF IP
+
+description:
+  The IP supports playback and capture of SPDIF audio.
+
+maintainers:
+  - Vincenzo Frascino <[e-mail]>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - xlnx,spdif-2.0
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: SPDIF audio interrupt
+
+  clock-names:
+    items:
+      - const: aud_clk_i
+      - const: s_axi_aclk
+
+  clocks:
+    minItems: 1
+    items:
+      - description: input audio clock
+      - description: clock for the AXI data stream
+
+  xlnx,spdif-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum:
+      - 0
+      - 1
+    description: |
+      0 - receiver
+      1 - transmitter
+
+  xlnx,aud_clk_i:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Input audio clock frequency. It affects the sampling rate.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clock-names
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    spdif@80010000 {
+      compatible = "xlnx,spdif-2.0";
+      reg = <0x80010000 0x10000>;
+      clock-names = "aud_clk_i", "s_axi_aclk";
+      clocks = <&misc_clk_0>, <&clk 71>;
+      interrupt-parent = <&gic>;
+      interrupts = <0 91 4>;
+      xlnx,spdif-mode = <1>;
+      xlnx,aud_clk_i = <49152913>;
+    };
+
+...