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1e908b2419
The BD71837 buck output voltages are in a few cases scaled using external connection which adds a pull-up to regulator feedback pin. This connection will adjust output voltage from regulator in a deterministic way. Add support for describing this HW connection so that driver can adjust voltage ranges accordingly. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Link: https://lore.kernel.org/r/9959924313db7c7165598604f9a07bf227f471a8.1604994184.git.matti.vaittinen@fi.rohmeurope.com Signed-off-by: Mark Brown <broonie@kernel.org>
162 lines
6.0 KiB
YAML
162 lines
6.0 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/regulator/rohm,bd71837-regulator.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: ROHM BD71837 Power Management Integrated Circuit regulators
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maintainers:
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- Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
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description: |
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List of regulators provided by this controller. BD71837 regulators node
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should be sub node of the BD71837 MFD node. See BD71837 MFD bindings at
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Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.yaml
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Regulator nodes should be named to BUCK_<number> and LDO_<number>. The
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definition for each of these nodes is defined using the standard
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binding for regulators at
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Documentation/devicetree/bindings/regulator/regulator.txt.
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Note that if BD71837 starts at RUN state you probably want to use
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regulator-boot-on at least for BUCK6 and BUCK7 so that those are not
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disabled by driver at startup. LDO5 and LDO6 are supplied by those and
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if they are disabled at startup the voltage monitoring for LDO5/LDO6 will
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cause PMIC to reset.
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#The valid names for BD71837 regulator nodes are:
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#BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6, BUCK7, BUCK8
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#LDO1, LDO2, LDO3, LDO4, LDO5, LDO6, LDO7
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patternProperties:
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"^LDO[1-7]$":
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type: object
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$ref: regulator.yaml#
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description:
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Properties for single LDO regulator.
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properties:
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regulator-name:
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pattern: "^ldo[1-7]$"
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description:
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should be "ldo1", ..., "ldo7"
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unevaluatedProperties: false
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"^BUCK[1-8]$":
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type: object
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$ref: regulator.yaml#
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description:
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Properties for single BUCK regulator.
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properties:
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regulator-name:
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pattern: "^buck[1-8]$"
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description:
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should be "buck1", ..., "buck8"
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rohm,dvs-run-voltage:
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$ref: "/schemas/types.yaml#/definitions/uint32"
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minimum: 0
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maximum: 1300000
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description:
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PMIC default "RUN" state voltage in uV. See below table for
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bucks which support this. 0 means disabled.
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rohm,dvs-idle-voltage:
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$ref: "/schemas/types.yaml#/definitions/uint32"
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minimum: 0
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maximum: 1300000
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description:
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PMIC default "IDLE" state voltage in uV. See below table for
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bucks which support this. 0 means disabled.
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rohm,dvs-suspend-voltage:
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$ref: "/schemas/types.yaml#/definitions/uint32"
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minimum: 0
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maximum: 1300000
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description:
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PMIC default "SUSPEND" state voltage in uV. See below table for
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bucks which support this. 0 means disabled.
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# Supported default DVS states:
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#
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# BD71837:
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# buck | dvs-run-voltage | dvs-idle-voltage | dvs-suspend-voltage
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# ----------------------------------------------------------------
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# 1 | supported | supported | supported
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# ----------------------------------------------------------------
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# 2 | supported | supported | not supported
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# ----------------------------------------------------------------
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# 3 | supported | not supported | not supported
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# ----------------------------------------------------------------
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# 4 | supported | not supported | not supported
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# ----------------------------------------------------------------
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# rest | not supported | not supported | not supported
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# BD71837 power outputs can either be controlled by the PMIC internal
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# hardware state machine or by software. If you need regulators to be
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# turned ON/OFF for example based on PMIC_STBY_REQ line (which toggles
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# PMIC HW state machine) - then you should set this property.
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# Tradeoff is that then SW can't control the ON/OFF state for this
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# regulator (other than invoking a PMIC state change).
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rohm,no-regulator-enable-control:
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description: |
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Enable/Disable control of this regulator must be left to the
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PMIC hardware state machine.
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type: boolean
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# Setups where regulator (especially the buck8) output voltage is scaled
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# by adding external connection where some other regulator output is
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# connected to feedback-pin (over suitable resistors) is getting popular
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# amongst users of BD71837. (This allows for example scaling down the
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# buck8 voltages to suit lover GPU voltages for projects where buck8 is
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# (ab)used to supply power for GPU.
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#
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# So we allow describing this external connection from DT and scale the
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# voltages accordingly. This is what the connection should look like:
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#
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# |---------------|
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# | buck 8 |-------+----->Vout
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# | | |
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# |---------------| |
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# | |
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# | |
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# +-------+--R2----+
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# |
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# R1
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# |
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# V FB-pull-up
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#
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# Here the buck output is sifted according to formula:
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#
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# Vout_o = Vo - (Vpu - Vo)*R2/R1
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# Linear_step = step_orig*(R1+R2)/R1
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#
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# where:
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# Vout_o is adjusted voltage output at vsel reg value 0
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# Vo is original voltage output at vsel reg value 0
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# Vpu is the pull-up voltage V FB-pull-up in the picture
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# R1 and R2 are resistor values.
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rohm,fb-pull-up-microvolt:
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description:
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Feedback-pin has pull-up connection to adjust voltage range. This is
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the used pull-up voltage before R1.
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rohm,feedback-pull-up-r1-ohms:
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description:
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Feedback-pin has pull-up connection to adjust voltage range. This is
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the used R1 resistor.
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rohm,feedback-pull-up-r2-ohms:
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description:
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Feedback-pin has pull-up connection to adjust voltage range. This is
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the used R2 resistor.
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required:
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- regulator-name
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unevaluatedProperties: false
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additionalProperties: false
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