[PATCH v3 1/7] dt-bindings: pincfg-node: Add input-voltage-microvolt property

[Conor Dooley]

On Thu, Mar 12, 2026 at 07:30:34PM +0800, Yu-Chun Lin wrote:
> From: Tzuyi Chang <tychang at realtek.com>
> 
> Add a generic pin configuration property "input-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 at realtek.com>
> Co-developed-by: Yu-Chun Lin <eleanor.lin at realtek.com>
> Signed-off-by: Yu-Chun Lin <eleanor.lin at realtek.com>
> ---
> Changes in v3:
> - Rebased onto the devel branch of the pinctrl tree.
> - Improved commit message and description.
> ---
>  Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> index fe936ab09104..fd49a0d53bf0 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
> @@ -162,6 +162,11 @@ properties:
>        this affects the expected delay in ps before latching a value to
>        an output pin.
>  
> +  input-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.

Should this be added here:
  - if:
      required:
        - input-disable
    then:
      properties:
        input-enable: false

and made mutually exclusive with input-disable?

> +
>  allOf:
>    - if:
>        required:
> -- 
> 2.34.1
> 
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