dt-bindings:iio:dac:maxim,max5821 yaml conversion

Simple txt to yaml conversion for this binding description.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Philippe Reynes <tremyfr@yahoo.fr>
Link: https://lore.kernel.org/r/20201031134110.724233-22-jic23@kernel.org

Documentation/devicetree/bindings/iio/dac/max5821.txt

-Maxim max5821 DAC device driver
-
-Required properties:
-	- compatible: Must be "maxim,max5821"
-	- reg: Should contain the DAC I2C address
-	- vref-supply: Phandle to the vref power supply
-
-Example:
-
-	max5821@38 {
-		compatible = "maxim,max5821";
-		reg = <0x38>;
-		vref-supply = <&reg_max5821>;
-	};

Documentation/devicetree/bindings/iio/dac/maxim,max5821.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/maxim,max5821.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim max5821 dual 10-bit DAC
+
+maintainers:
+  - Philippe Reynes <tremyfr@yahoo.fr>
+
+description: |
+  Datasheet publicly available at:
+  https://datasheets.maximintegrated.com/en/ds/MAX5821.pdf
+
+properties:
+  compatible:
+    const: maxim,max5821
+
+  reg:
+    maxItems: 1
+
+  vref-supply: true
+
+required:
+  - compatible
+  - reg
+  - vref-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@38 {
+            compatible = "maxim,max5821";
+            reg = <0x38>;
+            vref-supply = <&reg_max5821>;
+        };
+    };
+...