regulator: Add regulator-output binding

This describes a power output supplied by a regulator, such as a
power outlet on a power distribution unit (PDU).
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221031233704.22575-3-zev@bewilderbeest.netSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/regulator-output.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/regulator/regulator-output.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Regulator output connector
+
+maintainers:
+  - Zev Weiss <zev@bewilderbeest.net>
+
+description: |
+  This describes a power output connector supplied by a regulator,
+  such as a power outlet on a power distribution unit (PDU).  The
+  connector may be standalone or merely one channel or set of pins
+  within a ganged physical connector carrying multiple independent
+  power outputs.
+
+properties:
+  compatible:
+    const: regulator-output
+
+  vout-supply:
+    description:
+      Phandle of the regulator supplying the output.
+
+required:
+  - compatible
+  - vout-supply
+
+additionalProperties: false
+
+examples:
+  - |
+      output {
+          compatible = "regulator-output";
+          vout-supply = <&output_reg>;
+      };