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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/regulator/rohm,bd71847-regulator.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ROHM BD71847 and BD71850 Power Management Integrated Circuit regulators
maintainers:
- Matti Vaittinen <mazziesaccount@gmail.com>
description: |
List of regulators provided by this controller. BD71847 regulators node
should be sub node of the BD71847 MFD node. See BD71847 MFD bindings at
Documentation/devicetree/bindings/mfd/rohm,bd71847-pmic.yaml
Regulator nodes should be named to BUCK_<number> and LDO_<number>. The
definition for each of these nodes is defined using the standard
binding for regulators at
Documentation/devicetree/bindings/regulator/regulator.txt.
Note that if BD71847 starts at RUN state you probably want to use
regulator-boot-on at least for BUCK5. LDO6 is supplied by it and it must
not be disabled by driver at startup. If BUCK5 is disabled at startup the
voltage monitoring for LDO5/LDO6 can cause PMIC to reset.
# The valid names for BD71847 regulator nodes are:
# BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6
# LDO1, LDO2, LDO3, LDO4, LDO5, LDO6
patternProperties:
"^LDO[1-6]$":
type: object
$ref: regulator.yaml#
description:
Properties for single LDO regulator.
properties:
regulator-name:
pattern: "^ldo[1-6]$"
description:
should be "ldo1", ..., "ldo6"
unevaluatedProperties: false
"^BUCK[1-6]$":
type: object
$ref: regulator.yaml#
description:
Properties for single BUCK regulator.
properties:
regulator-name:
pattern: "^buck[1-6]$"
description:
should be "buck1", ..., "buck6"
rohm,dvs-run-voltage:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 1300000
description:
PMIC default "RUN" state voltage in uV. See below table for
bucks which support this. 0 means disabled.
rohm,dvs-idle-voltage:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 1300000
description:
PMIC default "IDLE" state voltage in uV. See below table for
bucks which support this. 0 means disabled.
rohm,dvs-suspend-voltage:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 1300000
description:
PMIC default "SUSPEND" state voltage in uV. See below table for
bucks which support this. 0 means disabled.
# Supported default DVS states:
#
# BD71847:
# buck | dvs-run-voltage | dvs-idle-voltage | dvs-suspend-voltage
# ----------------------------------------------------------------
# 1 | supported | supported | supported
# ----------------------------------------------------------------
# 2 | supported | supported | not supported
# ----------------------------------------------------------------
# rest | not supported | not supported | not supported
# BD718(47/50) power outputs can either be controlled by the PMIC internal
# hardware state machine or by software. If you need regulators to be
# turned ON/OFF for example based on PMIC_STBY_REQ line (which toggles
# PMIC HW state machine) - then you should set this property.
# Tradeoff is that then SW can't control the ON/OFF state for this
# regulator (other than invoking a PMIC state change).
rohm,no-regulator-enable-control:
description: |
Enable/Disable control of this regulator must be left to the
PMIC hardware state machine.
type: boolean
# Setups where regulator (especially the buck8) output voltage is scaled
# by adding external connection where some other regulator output is
# connected to feedback-pin (over suitable resistors) is getting popular
# amongst users of BD71837. (This allows for example scaling down the
# buck8 voltages to suit lover GPU voltages for projects where buck8 is
# (ab)used to supply power for GPU.
#
# So we allow describing this external connection from DT and scale the
# voltages accordingly. This is what the connection should look like:
#
# |---------------|
# | buck 8 |-------+----->Vout
# | | |
# |---------------| |
# | |
# | |
# +-------+--R2----+
# |
# R1
# |
# V FB-pull-up
#
# Here the buck output is sifted according to formula:
#
# Vout_o = Vo - (Vpu - Vo)*R2/R1
# Linear_step = step_orig*(R1+R2)/R1
#
# where:
# Vout_o is adjusted voltage output at vsel reg value 0
# Vo is original voltage output at vsel reg value 0
# Vpu is the pull-up voltage V FB-pull-up in the picture
# R1 and R2 are resistor values.
rohm,fb-pull-up-microvolt:
description:
Feedback-pin has pull-up connection to adjust voltage range. This is
the used pull-up voltage before R1.
rohm,feedback-pull-up-r1-ohms:
description:
Feedback-pin has pull-up connection to adjust voltage range. This is
the used R1 resistor.
rohm,feedback-pull-up-r2-ohms:
description:
Feedback-pin has pull-up connection to adjust voltage range. This is
the used R2 resistor.
required:
- regulator-name
unevaluatedProperties: false
additionalProperties: false
|
