166 lines
4.5 KiB
YAML
166 lines
4.5 KiB
YAML
# Copyright (c) 2020, Linaro Limited
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Generic pin configuration schema.
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This file is equivalent to pincfg-node.yaml but inserts properties at a
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grandchildren level, useful for group based representation.
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child-binding:
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child-binding:
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description: |
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Many data items that are represented in a pin configuration node are
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common and generic. Pin control bindings should use the properties
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defined below where they are applicable; not all of these properties are
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relevant or useful for all hardware or binding structures. Each
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individual binding document should state which of these generic
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properties, if any, are used, and the structure of the DT nodes that
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contain these properties.
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This is based on Linux, documentation:
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https://www.kernel.org/doc/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
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properties:
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bias-disable:
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required: false
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type: boolean
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description: disable any pin bias
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bias-high-impedance:
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required: false
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type: boolean
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description: high impedance mode ("third-state", "floating")
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bias-bus-hold:
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required: false
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type: boolean
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description: latch weakly
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bias-pull-up:
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required: false
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type: boolean
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description: enable pull-up resistor
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bias-pull-down:
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required: false
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type: boolean
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description: enable pull-down resistor
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bias-pull-pin-default:
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required: false
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type: boolean
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description: use pin's default pull state
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drive-push-pull:
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required: false
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type: boolean
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description: drive actively high and low
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drive-open-drain:
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required: false
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type: boolean
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description: drive with open drain (hardware AND)
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drive-open-source:
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required: false
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type: boolean
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description: drive with open source (hardware OR)
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drive-strength:
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required: false
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type: int
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description: maximum sink or source current in mA
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drive-strength-microamp:
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required: false
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type: int
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description: maximum sink or source current in μA
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input-enable:
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required: false
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type: boolean
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description: |
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enable input on pin (no effect on output, such as enabling an input
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buffer)
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input-disable:
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required: false
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type: boolean
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description: |
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disable input on pin (no effect on output, such as disabling an input
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buffer)
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input-schmitt-enable:
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required: false
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type: boolean
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description: enable schmitt-trigger mode
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input-schmitt-disable:
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required: false
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type: boolean
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description: disable schmitt-trigger mode
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input-debounce:
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required: false
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type: int
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description: |
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Takes the debounce time in μsec, as argument or 0 to disable debouncing
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power-source:
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required: false
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type: int
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description: select between different power supplies
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low-power-enable:
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required: false
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type: boolean
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description: enable low power mode
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low-power-disable:
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required: false
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type: boolean
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description: disable low power mode
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output-disable:
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required: false
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type: boolean
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description: disable output on a pin (such as disable an output buffer)
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output-enable:
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required: false
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type: boolean
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description: |
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enable output on a pin without actively driving it (such as enabling
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an output buffer)
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output-low:
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required: false
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type: boolean
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description: set the pin to output mode with low level
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output-high:
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required: false
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type: boolean
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description: set the pin to output mode with high level
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sleep-hardware-state:
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required: false
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type: boolean
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description: |
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indicate this is sleep related state which will be programmed into
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the registers for the sleep state
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slew-rate:
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required: false
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type: int
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description: set the slew rate
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skew-delay:
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required: false
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type: int
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description: |
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This affects the expected clock skew on input pins and the delay
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before latching a value to an output pin. Typically indicates how
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many double-inverters are used to delay the signal.
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