dt-bindings: iio: dac: Migrate LTC1660 documentation to yaml

Rewrite bindings to use json-schema vocabulary.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/dac/lltc,ltc1660.yaml

+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+# Copyright 2019 Marcus Folkesson <marcus.folkesson@gmail.com>
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/bindings/iio/dac/lltc,ltc1660.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Linear Technology Micropower octal 8-Bit and 10-Bit DACs
+
+maintainers:
+  - Marcus Folkesson <marcus.folkesson@gmail.com>
+
+description: |
+  Bindings for the Linear Technology Micropower octal 8-Bit and 10-Bit DAC.
+  Datasheet can be found here: https://www.analog.com/media/en/technical-documentation/data-sheets/166560fa.pdf
+
+properties:
+  compatible:
+    enum:
+      - lltc,ltc1660
+      - lltc,ltc1665
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 5000000
+
+  vref-supply:
+    description: Phandle to the external reference voltage supply.
+
+required:
+  - compatible
+  - reg
+  - vref-supply
+
+examples:
+  - |
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+  
+      dac@0 {
+        compatible = "lltc,ltc1660";
+        reg = <0>;
+        spi-max-frequency = <5000000>;
+        vref-supply = <&vref_reg>;
+      };
+    };

Documentation/devicetree/bindings/iio/dac/ltc1660.txt

-* Linear Technology Micropower octal 8-Bit and 10-Bit DACs
-
-Required properties:
- - compatible: Must be one of the following:
-		"lltc,ltc1660"
-		"lltc,ltc1665"
- - reg: SPI chip select number for the device
- - vref-supply: Phandle to the voltage reference supply
-
-Recommended properties:
- - spi-max-frequency: Definition as per
-	 Documentation/devicetree/bindings/spi/spi-bus.txt.
-	 Max frequency for this chip is 5 MHz.
-
-Example:
-dac@0 {
-	compatible = "lltc,ltc1660";
-	reg = <0>;
-	spi-max-frequency = <5000000>;
-	vref-supply = <&vref_reg>;
-};

MAINTAINERS

@@ -9622,7 +9622,7 @@ LTC1660 DAC DRIVER
 M:	Marcus Folkesson <marcus.folkesson@gmail.com>
 L:	linux-iio@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/iio/dac/ltc1660.txt
+F:	Documentation/devicetree/bindings/iio/dac/lltc,ltc1660.yaml
 F:	drivers/iio/dac/ltc1660.c
 
 LTC2983 IIO TEMPERATURE DRIVER