dt-bindings: iio: adc: ti,adc128s052 yaml conversion.

Simple binding.  Only addition to txt version is
as a provider of channels to other devices using the consumer
binding.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Link: https://lore.kernel.org/r/20200809111753.156236-10-jic23@kernel.org

Documentation/devicetree/bindings/iio/adc/ti,adc128s052.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,adc128s052.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADC128S052 and similar ADCs
+
+maintainers:
+  - Angelo Compagnucci <angelo.compagnucci@gmail.com>
+
+description: |
+  Family of 12 bit SPI ADCs with 2 to 8 channels with a range of different
+  target sample rates.
+
+properties:
+  compatible:
+    enum:
+      - ti,adc122s021
+      - ti,adc122s051
+      - ti,adc122s101
+      - ti,adc124s021
+      - ti,adc124s051
+      - ti,adc124s101
+      - ti,adc128s052
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency: true
+
+  vref-supply: true
+
+  "#io-channel-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - vref-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "ti,adc128s052";
+            reg = <0>;
+            vref-supply = <&vdd_supply>;
+            spi-max-frequency = <1000000>;
+            #io-channel-cells = <1>;
+        };
+    };
+...

Documentation/devicetree/bindings/iio/adc/ti-adc128s052.txt

-* Texas Instruments' ADC128S052, ADC122S021 and ADC124S021 ADC chip
-
-Required properties:
- - compatible: Should be one of:
-   - "ti,adc128s052"
-   - "ti,adc122s021"
-   - "ti,adc122s051"
-   - "ti,adc122s101"
-   - "ti,adc124s021"
-   - "ti,adc124s051"
-   - "ti,adc124s101"
- - reg: spi chip select number for the device
- - vref-supply: The regulator supply for ADC reference voltage
-
-Recommended properties:
- - spi-max-frequency: Definition as per
-		Documentation/devicetree/bindings/spi/spi-bus.txt
-
-Example:
-adc@0 {
-	compatible = "ti,adc128s052";
-	reg = <0>;
-	vref-supply = <&vdd_supply>;
-	spi-max-frequency = <1000000>;
-};