[PATCH v3] ASoC: dt-bindings: cdns,xtfpga-i2s: Convert to dt-schema

[Chaitanya Sabnis <chaitanya.msabnis@gmail.com>]

Convert the xtfpga I2S controller plain-text binding documentation
to standard dt-schema.

The hardware requires exactly one memory region, one interrupt line,
and one phandle to the master clock. Verified these constraints against
the driver source in sound/soc/xtensa/xtfpga-i2s.c.

Also explicitly define the '#sound-dai-cells' property, as it is
required for audio routing but was omitted from the original
text properties list.

Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chaitanya Sabnis <chaitanya.msabnis@gmail.com>
---
 .../bindings/sound/cdns,xtfpga-i2s.txt        | 18 -------
 .../bindings/sound/cdns,xtfpga-i2s.yaml       | 48 +++++++++++++++++++
 2 files changed, 48 insertions(+), 18 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.txt
 create mode 100644 Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.yaml

diff --git a/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.txt b/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.txt
deleted file mode 100644
index 860fc0da39c0..000000000000
--- a/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.txt
+++ /dev/null
@@ -1,18 +0,0 @@
-Bindings for I2S controller built into xtfpga Xtensa bitstreams.
-
-Required properties:
-- compatible: shall be "cdns,xtfpga-i2s".
-- reg: memory region (address and length) with device registers.
-- interrupts: interrupt for the device.
-- clocks: phandle to the clk used as master clock. I2S bus clock
-  is derived from it.
-
-Examples:
-
-	i2s0: xtfpga-i2s@d080000 {
-		#sound-dai-cells = <0>;
-		compatible = "cdns,xtfpga-i2s";
-		reg = <0x0d080000 0x40>;
-		interrupts = <2 1>;
-		clocks = <&cdce706 4>;
-	};
diff --git a/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.yaml b/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.yaml
new file mode 100644
index 000000000000..9617acef3f0c
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cdns,xtfpga-i2s.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/cdns,xtfpga-i2s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2S controller built into xtfpga Xtensa bitstreams
+
+maintainers:
+  - Max Filippov <jcmvbkbc@gmail.com>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: cdns,xtfpga-i2s
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description: phandle to the clk used as master clock. I2S bus clock is derived from it.
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2s@d080000 {
+        compatible = "cdns,xtfpga-i2s";
+        reg = <0x0d080000 0x40>;
+        interrupts = <2 1>;
+        clocks = <&cdce706 4>;
+        #sound-dai-cells = <0>;
+    };
-- 
2.43.0