Re: [PATCH v4 1/2] dt-bindings: iio: adc: ti,ads112c04: Add binding for ADS112C04

On Tue, Aug 11, 2026 at 10:48:37AM +0800, Kyle Hsieh wrote:
> Add device tree binding documentation for Texas Instruments ADS112C04
> I2C Analog-to-Digital Converters.
> 
> These devices provide 4-channel, 16-bit delta-sigma ADCs with an I2C
> interface, programmable gain amplifier (PGA), and data-ready (DRDY)
> interrupt output.
> 
> The binding uses child nodes to dynamically define the connected
> single-ended or differential channels.
> 
> Excitation current, burn-out current, and reference source properties
> are also included to fully describe the chip's hardware capabilities,
> aligned with the ti,ads112c14 binding conventions.
> 
> Signed-off-by: Kyle Hsieh <[email protected]>

> +patternProperties:
> +  "^channel@[0-9a-b]$":
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +    properties:
> +      reg:
> +        items:
> +          - maximum: 11
> +
> +      single-channel:
> +        maximum: 3

Can someone explain to me please why the maximum for this is 3 when reg
goes up to 11? What do the additional reg entries beyond 3 represent?

> +
> +      diff-channels:
> +        items:
> +          maximum: 3
> +
> +      excitation-channels:
> +        maxItems: 2
> +        items:
> +          maximum: 5
> +        description:
> +          Additionally to AIN0-AIN3, IDAC1/IDAC2 can also be routed to
> +          REFP0 (4) and REFN0 (5).

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