dt_bindings: regulator: Add ROHM BD9576MUF and BD9573MUF PMICs

    Add bindings for regulators on ROHM BD9576MUF and BD9573MUF PMICs.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/91f6bcbcfce7de3d92c40a6b3a9e4bd84420deee.1600329307.git.matti.vaittinen@fi.rohmeurope.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/rohm,bd9576-regulator.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/rohm,bd9576-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD9576 and BD9573 Power Management Integrated Circuit regulators
+
+maintainers:
+  - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
+
+description: |
+  This module is part of the ROHM BD9576 MFD device. For more details
+  see Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml.
+
+  The regulator controller is represented as a sub-node of the PMIC node
+  on the device tree.
+
+  The valid names for BD9576 regulator nodes are
+  vd50, vd18, vdddr, vd10, voutl1, vouts1
+
+patternProperties:
+  "regulator-.+":
+    type: object
+    description:
+      Properties for single regulator.
+    $ref: "regulator.yaml#"
+
+    required:
+      - regulator-name
+
+    unevaluatedProperties: false
+additionalProperties: false