dt-bindings:iio:impedance-analyzer:adi,ad5933 yaml conversion.

The example in this one had a completely wrong compatible so I've
fixed that. Otherwise, a fairly simple conversion.

Note the driver itself is still in staging.  Looking back at the
last discussion around this, I think we were just waiting for some
test results on some refactors.  As such the binding should be stable
even if the driver might need a little more love and attention.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Cc: Gabriel Capella <gabriel@capella.pro>
Cc: Alexandru Ardelean <Alexandru.Ardelean@analog.com>
Link: https://lore.kernel.org/r/20201031184854.745828-6-jic23@kernel.org

Documentation/devicetree/bindings/iio/impedance-analyzer/ad5933.txt

-Analog Devices AD5933/AD5934 Impedance Converter, Network Analyzer
-
-https://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf
-https://www.analog.com/media/en/technical-documentation/data-sheets/AD5934.pdf
-
-Required properties:
- - compatible : should be one of
-		"adi,ad5933"
-		"adi,ad5934"
- - reg : the I2C address.
- - vdd-supply : The regulator supply for DVDD, AVDD1 and AVDD2 when they
-   are connected together.
-
-Optional properties:
-- clocks : external clock reference.
-- clock-names : must be "mclk" if clocks is set.
-
-Example for a I2C device node:
-
-	impedance-analyzer@0d {
-		compatible = "adi,adxl345";
-		reg = <0x0d>;
-		vdd-supply = <&vdd_supply>;
-		clocks = <&ref_clk>;
-		clock-names = "mclk";
-	};

Documentation/devicetree/bindings/iio/impedance-analyzer/adi,ad5933.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/impedance-analyzer/adi,ad5933.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD5933/AD5934 Impedance Converter, Network Analyzer
+
+maintainers:
+  - Marcelo Schmitt <marcelo.schmitt1@gmail.com>
+  - Gabriel Capella <gabriel@capella.pro>
+
+description: |
+  https://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf
+  https://www.analog.com/media/en/technical-documentation/data-sheets/AD5934.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad5933
+      - adi,ad5934
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: |
+      The regulator supply for DVDD, AVDD1 and AVDD2 when they
+      are connected together.  Used to calculate voltage scaling of measurement
+      channels.
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: mclk
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        impedance-analyzer@d {
+            compatible = "adi,ad5933";
+            reg = <0x0d>;
+            vdd-supply = <&vdd_supply>;
+            clocks = <&ref_clk>;
+            clock-names = "mclk";
+        };
+    };
+...