dt-bindings: regulator: ROHM BD72720

The ROHM BD72720 is a new PMIC with 10 BUCk and 11 LDO regulators.

The BD72720 is designed to support using the BUCK10 as a supply for
the LDOs 1 to 4. When the BUCK10 is used for this, it can be set to a
LDON_HEAD mode. In this mode, the BUCK10 voltage can't be controlled by
software, but the voltage is adjusted by PMIC to match the LDO1 .. LDO4
voltages with a given offset. Offset can be 50mV .. 300mV and is
changeable at 50mV steps.

Add 'ldon-head-microvolt' property to denote a board which is designed
to utilize the LDON_HEAD mode.

All other properties are already existing.

Add dt-binding doc for ROHM BD72720 regulators to make it usable.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/81cb38d0ae1b3fa426e40d5b0a93f69a0f374657.1765804226.git.mazziesaccount@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: M-Vaittinen

Documentation/devicetree/bindings/regulator/rohm,bd72720-regulator.yaml

@@ -0,0 +1,148 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/rohm,bd72720-regulator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BD72720 Power Management Integrated Circuit regulators
+
+maintainers:
+  - Matti Vaittinen <mazziesaccount@gmail.com>
+
+description: |
+  This module is part of the ROHM BD72720 MFD device. For more details
+  see Documentation/devicetree/bindings/mfd/rohm,bd72720-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 BUCK_<number> and LDO_<number>.
+  The valid names for BD72720 regulator nodes are
+  buck1, buck2, buck3, buck4, buck5, buck6, buck7, buck8, buck9, buck10
+  ldo1, ldo2, ldo3, ldo4, ldo5, ldo6, ldo7, ldo8, ldo9, ldo10, ldo11
+
+patternProperties:
+  "^ldo([1-9]|1[0-1])$":
+    type: object
+    description:
+      Properties for single LDO regulator.
+    $ref: regulator.yaml#
+
+    properties:
+      regulator-name:
+        pattern: "^ldo([1-9]|1[0-1])$"
+
+      rohm,dvs-run-voltage:
+        description:
+          PMIC default "RUN" state voltage in uV. See below table for
+          LDOs which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-idle-voltage:
+        description:
+          PMIC default "IDLE" state voltage in uV. See below table for
+          LDOs which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-suspend-voltage:
+        description:
+          PMIC default "SUSPEND" state voltage in uV. See below table for
+          LDOs which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-lpsr-voltage:
+        description:
+          PMIC default "deep-idle" state voltage in uV. See below table for
+          LDOs which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+        # Supported default DVS states:
+        #     ldo        |    run     |   idle    | suspend   | lpsr
+        # --------------------------------------------------------------
+        # 1, 2, 3, and 4 | supported  | supported | supported | supported
+        # --------------------------------------------------------------
+        # 5 - 11         |                    supported (*)
+        # --------------------------------------------------------------
+        #
+        # (*) All states use same voltage but have own enable / disable
+        #      settings. Voltage 0 can be specified for a state to make
+        #      regulator disabled on that state.
+
+    unevaluatedProperties: false
+
+  "^buck([1-9]|10)$":
+    type: object
+    description:
+      Properties for single BUCK regulator.
+    $ref: regulator.yaml#
+
+    properties:
+      regulator-name:
+        pattern: "^buck([1-9]|10)$"
+
+      rohm,ldon-head-microvolt:
+        description:
+          Set this on boards where BUCK10 is used to supply LDOs 1-4. The bucki
+          voltage will be changed by the PMIC to follow the LDO output voltages
+          with the offset voltage given here. This will improve the LDO efficiency.
+        minimum: 50000
+        maximum: 300000
+
+      rohm,dvs-run-voltage:
+        description:
+          PMIC default "RUN" state voltage in uV. See below table for
+          bucks which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-idle-voltage:
+        description:
+          PMIC default "IDLE" state voltage in uV. See below table for
+          bucks which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-suspend-voltage:
+        description:
+          PMIC default "SUSPEND" state voltage in uV. See below table for
+          bucks which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+      rohm,dvs-lpsr-voltage:
+        description:
+          PMIC default "deep-idle" state voltage in uV. See below table for
+          bucks which support this. 0 means disabled.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 3300000
+
+        # Supported default DVS states:
+        #     buck       |    run     |   idle    | suspend   | lpsr
+        # --------------------------------------------------------------
+        # 1, 2, 3, and 4 | supported  | supported | supported | supported
+        # --------------------------------------------------------------
+        # 5 - 10    |                    supported (*)
+        # --------------------------------------------------------------
+        #
+        # (*) All states use same voltage but have own enable / disable
+        #      settings. Voltage 0 can be specified for a state to make
+        #      regulator disabled on that state.
+
+    required:
+      - regulator-name
+
+    unevaluatedProperties: false
+
+additionalProperties: false