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dt-bindings: pincfg-node: Add input-threshold-voltage-microvolt property

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Add a generic pin configuration property
"input-threshold-voltage-microvolt" to support hardware designs where the
input logic threshold is decoupled from the power supply voltage.

This property allows the pinctrl driver to configure the correct internal
reference voltage for pins that need to accept input signals at a different
voltage level than their power supply. For example, a pin powered by 3.3V
may need to accept 1.8V logic signals.

This defines the reference for VIH (Input High Voltage) and VIL (Input Low
Voltage) thresholds, enabling proper signal detection across different
voltage domains.

Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Co-developed-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>
This commit is contained in:
Tzuyi Chang 2026-03-17 19:54:04 +08:00 committed by Linus Walleij
parent 1f54518447
commit 7b9fe771dc
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
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@ -162,6 +162,11 @@ properties:
this affects the expected delay in ps before latching a value to
an output pin.
input-threshold-voltage-microvolt:
description: Specifies the input voltage level of the pin in microvolts.
This defines the reference for VIH (Input High Voltage) and VIL
(Input Low Voltage) thresholds for proper signal detection.
allOf:
- if:
required:
@ -177,6 +182,7 @@ allOf:
then:
properties:
input-enable: false
input-threshold-voltage-microvolt: false
- if:
required: