linux-kernel - Re: [PATCH v3 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Date: Thu, 8 Feb 2024 18:03:15 +0000
From: Conor Dooley <conor@...nel.org>
To: Alisa-Dariana Roman <alisadariana@...il.com>
Cc: alexandru.tachici@...log.com, alisa.roman@...log.com,
	conor+dt@...nel.org, devicetree@...r.kernel.org,
	dlechner@...libre.com, jic23@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, krzysztof.kozlowski@...aro.org,
	lars@...afoo.de, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.hennerich@...log.com,
	robh+dt@...nel.org
Subject: Re: [PATCH v3 4/5] dt-bindings: iio: adc: ad7192: Add AD7194 support

Hey,

On Thu, Feb 08, 2024 at 07:24:58PM +0200, Alisa-Dariana Roman wrote:

> +patternProperties:
> +  "^channel@([0-7a-f])$":
> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        description: The channel index.
> +        minimum: 0
> +        maximum: 7

There are only 8 possible channels, at indices 0 to 7, so why is the
pattern property more permissive than that? Shouldn't "^channel@[0-7]$"
suffice?

> +
> +       diff-channels:

> +        description: |
> +          The differential channel pair for Ad7194 configurable channels. The
> +          first channel is the positive input, the second channel is the
> +          negative input.

This duplicates the description in adc.yaml

> +        items:
> +          minimum: 1
> +          maximum: 16

Hmm, this makes me wonder: why doesn't this match the number of channels
available and why is 0 not a valid channel for differential measurements?

Thanks,
Conor.

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