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

Convert the STM32 SPDIFRX bindings to DT schema format using json-schema.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200117170352.16040-1-olivier.moysan@st.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/st,stm32-spdifrx.txt

-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>;
-};

Documentation/devicetree/bindings/sound/st,stm32-spdifrx.yaml

+# 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";
+    };
+
+...