dt-bindings: iio: dac: Generalize DAC common properties

Introduce a generalized DAC binding that can be used by DACs that have
similar properties adding output-range-microamp and output-range-microvolt.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Kim Seer Paller <kimseer.paller@analog.com>
Link: https://patch.msgid.link/20240718051834.32270-4-kimseer.paller@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/dac/dac.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/dac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: IIO Common Properties for DAC Channels
+
+maintainers:
+  - Jonathan Cameron <jic23@kernel.org>
+
+description:
+  A few properties are defined in a common way for DAC channels.
+
+properties:
+  $nodename:
+    pattern: "^channel(@[0-9a-f]+)?$"
+    description:
+      A channel index should match reg.
+
+  reg:
+    maxItems: 1
+
+  label:
+    description: Unique name to identify which channel this is.
+
+  output-range-microamp:
+    maxItems: 2
+    minItems: 2
+    description:
+      Specify the channel output full scale range in microamperes.
+
+  output-range-microvolt:
+    maxItems: 2
+    minItems: 2
+    description:
+      Specify the channel output full scale range in microvolts.
+
+anyOf:
+  - oneOf:
+      - required:
+          - reg
+          - output-range-microamp
+      - required:
+          - reg
+          - output-range-microvolt
+  - required:
+      - reg
+
+additionalProperties: true