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# 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
...
|
