xref: /openbmc/linux/Documentation/devicetree/bindings/pinctrl/nvidia,tegra-pinmux-common.yaml (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/pinctrl/nvidia,tegra-pinmux-common.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: NVIDIA Tegra Pinmux Controller

maintainers:
  - Thierry Reding <thierry.reding@gmail.com>
  - Jonathan Hunter <jonathanh@nvidia.com>

description: |
  Please refer to pinctrl-bindings.txt in this directory for details of the
  common pinctrl bindings used by client devices, including the meaning of
  the phrase "pin configuration node".

  Tegra's pin configuration nodes act as a container for an arbitrary number
  of subnodes. Each of these subnodes represents some desired configuration
  for a pin, a group, or a list of pins or groups. This configuration can
  include the mux function to select on those pin(s)/ group(s), and various
  pin configuration parameters, such as pull-up, tristate, drive strength,
  etc.

  The name of each subnode is not important; all subnodes should be
  enumerated and processed purely based on their content.

  Each subnode only affects those parameters that are explicitly listed. In
  other words, a subnode that lists a mux function but no pin configuration
  parameters implies no information about any pin configuration parameters.

  Similarly, a pin subnode that describes a pullup parameter implies no
  information about e.g.  the mux function or tristate parameter. For this
  reason, even seemingly boolean values are actually tristates in this
  binding: unspecified, off, or on. Unspecified is represented as an absent
  property, and off/on are represented as integer values 0 and 1.

  Note that many of these properties are only valid for certain specific pins
  or groups. See the Tegra TRM and various pinmux spreadsheets for complete
  details regarding which groups support which functionality. The Linux
  pinctrl driver may also be a useful reference, since it consolidates,
  disambiguates, and corrects data from all those sources.

properties:
  nvidia,pins:
    $ref: /schemas/types.yaml#/definitions/string-array
    description: An array of strings. Each string contains the name of a pin
      or group.  Valid values for these names are listed below.

  nvidia,function:
    $ref: /schemas/types.yaml#/definitions/string
    description: A string containing the name of the function to mux to the
      pin or group. Valid values for function names are listed below. See the
      Tegra TRM to determine which are valid for each pin or group.

  nvidia,pull:
    description: Pull-down/up setting to apply to the pin.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: none
        const: 0
      - description: down
        const: 1
      - description: up
        const: 2

  nvidia,tristate:
    description: Tristate setting to apply to the pin.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: drive
        const: 0
      - description: tristate
        const: 1

  nvidia,schmitt:
    description: Enable Schmitt trigger on the input.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: disable Schmitt trigger on the input
        const: 0
      - description: enable Schmitt trigger on the input
        const: 1

  nvidia,pull-down-strength:
    description: Controls drive strength. 0 is weakest. The range of valid
      values depends on the pingroup. See "CAL_DRVDN" in the Tegra TRM.
    $ref: /schemas/types.yaml#/definitions/uint32

  nvidia,pull-up-strength:
    description: Controls drive strength. 0 is weakest. The range of valid
      values depends on the pingroup. See "CAL_DRVUP" in the Tegra TRM.
    $ref: /schemas/types.yaml#/definitions/uint32

  nvidia,high-speed-mode:
    description: Enable high speed mode the pins.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: normal speed mode
        const: 0
      - description: high speed mode
        const: 1

  nvidia,low-power-mode:
    description: Controls the drive power or current. Valid values are from 0
      through 3, where 0 specifies the least power and 3 specifies the most
      power. See "Low Power Mode" or "LPMD1" and "LPMD0" in the Tegra TRM.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 0, 1, 2, 3 ]

  nvidia,enable-input:
    description: Enable the pin's input path.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: disable input (i.e. output only)
        const: 0
      - description: enable input
        const: 1

  nvidia,open-drain:
    description: Open-drain configuration for the pin.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: disable open-drain
        const: 0
      - description: enable open-drain
        const: 1

  nvidia,lock:
    description: Lock the pin configuration against further changes until
      reset.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: disable pin configuration lock
        const: 0
      - description: enable pin configuration lock
        const: 1

  nvidia,io-reset:
    description: reset the I/O path
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 0, 1 ]

  nvidia,rcv-sel:
    description: select VIL/VIH receivers
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: normal receivers
        const: 0
      - description: high-voltage receivers
        const: 1

  nvidia,drive-type:
    description: Drive type to configure for the pin.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 0, 1, 2, 3 ]

  nvidia,io-hv:
    description: Select high-voltage receivers.
    $ref: /schemas/types.yaml#/definitions/uint32
    oneOf:
      - description: Use normal receivers.
        const: 0
      - description: Use high-voltage receivers.
        const: 1

  nvidia,slew-rate-rising:
    description: Controls rising signal slew rate. 0 is fastest. The range of
      valid values depends on the pingroup. See "DRVDN_SLWR" in the Tegra TRM.
    $ref: /schemas/types.yaml#/definitions/uint32

  nvidia,slew-rate-falling:
    description: Controls falling signal slew rate. 0 is fastest. The range of
      valid values depends on the pingroup. See "DRVUP_SLWF" in the Tegra TRM.
    $ref: /schemas/types.yaml#/definitions/uint32

additionalProperties: true
...