dt-bindings:iio:dac:fsl,vf610-dac yaml conversion

Simple binding to convert.  Example expanded a little to include
an example bus.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Sanchayan Maity <maitysanchayan@gmail.com>
Link: https://lore.kernel.org/r/20201031134110.724233-20-jic23@kernel.org

Documentation/devicetree/bindings/iio/dac/fsl,vf610-dac.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/fsl,vf610-dac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale vf610 Digital to Analog Converter
+
+maintainers:
+  - Sanchayan Maity <maitysanchayan@gmail.com>
+
+properties:
+  compatible:
+    const: fsl,vf610-dac
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: dac
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/vf610-clock.h>
+    bus@40000000 {
+        compatible = "fsl,aips-bus", "simple-bus";
+        reg = <0x40000000 0x00070000>;
+        ranges;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        dac@400cc000 {
+            compatible = "fsl,vf610-dac";
+            reg = <0x400cc000 0x1000>;
+            interrupts = <55 IRQ_TYPE_LEVEL_HIGH>;
+            clock-names = "dac";
+            clocks = <&clks VF610_CLK_DAC0>;
+        };
+    };
+...

Documentation/devicetree/bindings/iio/dac/vf610-dac.txt

-Freescale vf610 Digital to Analog Converter bindings
-
-The devicetree bindings are for the new DAC driver written for
-vf610 SoCs from Freescale.
-
-Required properties:
-- compatible: Should contain "fsl,vf610-dac"
-- reg: Offset and length of the register set for the device
-- interrupts: Should contain the interrupt for the device
-- clocks: The clock is needed by the DAC controller
-- clock-names: Must contain "dac" matching entry in the clocks property.
-
-Example:
-dac0: dac@400cc000 {
-	compatible = "fsl,vf610-dac";
-	reg = <0x400cc000 0x1000>;
-	interrupts = <55 IRQ_TYPE_LEVEL_HIGH>;
-	clock-names = "dac";
-	clocks = <&clks VF610_CLK_DAC0>;
-};