rohm,bd71847-regulator.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/regulator/rohm,bd71847-regulator.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: ROHM BD71847 and BD71850 Power Management Integrated Circuit regulators
    8 
    9 maintainers:
   10   - Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
   11 
   12 description: |
   13   List of regulators provided by this controller. BD71847 regulators node
   14   should be sub node of the BD71847 MFD node. See BD71847 MFD bindings at
   15   Documentation/devicetree/bindings/mfd/rohm,bd71847-pmic.yaml
   16   Regulator nodes should be named to BUCK_<number> and LDO_<number>. The
   17   definition for each of these nodes is defined using the standard
   18   binding for regulators at
   19   Documentation/devicetree/bindings/regulator/regulator.txt.
   20   Note that if BD71847 starts at RUN state you probably want to use
   21   regulator-boot-on at least for BUCK5. LDO6 is supplied by it and it must
   22   not be disabled by driver at startup. If BUCK5 is disabled at startup the
   23   voltage monitoring for LDO5/LDO6 can cause PMIC to reset.
   24 
   25 #The valid names for BD71847 regulator nodes are:
   26 #BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6
   27 #LDO1, LDO2, LDO3, LDO4, LDO5, LDO6
   28 
   29 patternProperties:
   30   "^LDO[1-6]$":
   31     type: object
   32     $ref: regulator.yaml#
   33     description:
   34       Properties for single LDO regulator.
   35 
   36     properties:
   37       regulator-name:
   38         pattern: "^ldo[1-6]$"
   39         description:
   40           should be "ldo1", ..., "ldo6"
   41 
   42     unevaluatedProperties: false
   43 
   44   "^BUCK[1-6]$":
   45     type: object
   46     $ref: regulator.yaml#
   47     description:
   48       Properties for single BUCK regulator.
   49 
   50     properties:
   51       regulator-name:
   52         pattern: "^buck[1-6]$"
   53         description:
   54           should be "buck1", ..., "buck6"
   55 
   56       rohm,dvs-run-voltage:
   57         $ref: "/schemas/types.yaml#/definitions/uint32"
   58         minimum: 0
   59         maximum: 1300000
   60         description:
   61           PMIC default "RUN" state voltage in uV. See below table for
   62           bucks which support this. 0 means disabled.
   63 
   64       rohm,dvs-idle-voltage:
   65         $ref: "/schemas/types.yaml#/definitions/uint32"
   66         minimum: 0
   67         maximum: 1300000
   68         description:
   69           PMIC default "IDLE" state voltage in uV. See below table for
   70           bucks which support this. 0 means disabled.
   71 
   72       rohm,dvs-suspend-voltage:
   73         $ref: "/schemas/types.yaml#/definitions/uint32"
   74         minimum: 0
   75         maximum: 1300000
   76         description:
   77           PMIC default "SUSPEND" state voltage in uV. See below table for
   78           bucks which support this. 0 means disabled.
   79 
   80         # Supported default DVS states:
   81         #
   82         # BD71847:
   83         # buck | dvs-run-voltage | dvs-idle-voltage | dvs-suspend-voltage
   84         # ----------------------------------------------------------------
   85         # 1    | supported       | supported        | supported
   86         # ----------------------------------------------------------------
   87         # 2    | supported       | supported        | not supported
   88         # ----------------------------------------------------------------
   89         # rest | not supported   | not supported    | not supported
   90 
   91       # BD718(47/50) power outputs can either be controlled by the PMIC internal
   92       # hardware state machine or by software. If you need regulators to be
   93       # turned ON/OFF for example based on PMIC_STBY_REQ line (which toggles
   94       # PMIC HW state machine) - then you should set this property.
   95       # Tradeoff is that then SW can't control the ON/OFF state for this
   96       # regulator (other than invoking a PMIC state change).
   97       rohm,no-regulator-enable-control:
   98         description: |
   99           Enable/Disable control of this regulator must be left to the
  100           PMIC hardware state machine.
  101         type: boolean
  102 
  103       # Setups where regulator (especially the buck8) output voltage is scaled
  104       # by adding external connection where some other regulator output is
  105       # connected to feedback-pin (over suitable resistors) is getting popular
  106       # amongst users of BD71837. (This allows for example scaling down the
  107       # buck8 voltages to suit lover GPU voltages for projects where buck8 is
  108       # (ab)used to supply power for GPU.
  109       #
  110       # So we allow describing this external connection from DT and scale the
  111       # voltages accordingly. This is what the connection should look like:
  112       #
  113       # |---------------|
  114       # |       buck 8  |-------+----->Vout
  115       # |               |       |
  116       # |---------------|       |
  117       #        |                |
  118       #        |                |
  119       #        +-------+--R2----+
  120       #                |
  121       #                R1
  122       #                |
  123       #        V FB-pull-up
  124       #
  125       # Here the buck output is sifted according to formula:
  126       #
  127       # Vout_o = Vo - (Vpu - Vo)*R2/R1
  128       # Linear_step = step_orig*(R1+R2)/R1
  129       #
  130       # where:
  131       # Vout_o is adjusted voltage output at vsel reg value 0
  132       # Vo is original voltage output at vsel reg value 0
  133       # Vpu is the pull-up voltage V FB-pull-up in the picture
  134       # R1 and R2 are resistor values.
  135 
  136       rohm,fb-pull-up-microvolt:
  137         description:
  138           Feedback-pin has pull-up connection to adjust voltage range. This is
  139           the used pull-up voltage before R1.
  140 
  141       rohm,feedback-pull-up-r1-ohms:
  142         description:
  143           Feedback-pin has pull-up connection to adjust voltage range. This is
  144           the used R1 resistor.
  145 
  146       rohm,feedback-pull-up-r2-ohms:
  147         description:
  148           Feedback-pin has pull-up connection to adjust voltage range. This is
  149           the used R2 resistor.
  150 
  151     required:
  152       - regulator-name
  153 
  154     unevaluatedProperties: false
  155 
  156 additionalProperties: false

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/regulator/rohm,bd71847-regulator.yaml

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sys/contrib/device-tree/Bindings/regulator/rohm,bd71847-regulator.yaml