dt-bindings: regulator: Add ROHM BD96802 PMIC

BD96802Qxx-C is an automotive grade configurable Power Management
Integrated Circuit supporting Functional Safety features for application
processors, SoCs and FPGAs. BD96802 is controlled via I2C, provides two
interrupt lines and has two controllable buck regulators.

The BD96802 belongs to the family of ROHM Scalable PMICs and is intended
to be used as a companion PMIC for the BD96801.

Signed-off-by: Matti Vaittinen <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/df7983[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

Documentation/devicetree/bindings/regulator/rohm,bd96802-regulator.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/rohm,bd96802-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD96802 Power Management Integrated Circuit regulators
+
+maintainers:
+  - Matti Vaittinen <[e-mail]>
+
+description:
+  This module is part of the ROHM BD96802 MFD device. For more details
+  see Documentation/devicetree/bindings/mfd/rohm,bd96802-pmic.yaml.
+
+  The regulator controller is represented as a sub-node of the PMIC node
+  on the device tree.
+
+  Regulator nodes should be named to buck1 and buck2.
+
+patternProperties:
+  "^buck[1-2]$":
+    type: object
+    description:
+      Properties for single BUCK regulator.
+    $ref: regulator.yaml#
+
+    properties:
+      rohm,initial-voltage-microvolt:
+        description:
+          Initial voltage for regulator. Voltage can be tuned +/-150 mV from
+          this value. NOTE, This can be modified via I2C only when PMIC is in
+          STBY state.
+        minimum: 500000
+        maximum: 3300000
+
+      rohm,keep-on-stby:
+        description:
+          Keep the regulator powered when PMIC transitions to STBY state.
+        type: boolean
+
+    unevaluatedProperties: false
+
+additionalProperties: false