linux-kernel - Re: [PATCH v4 3/4] dt-bindings: iio: adc: ad7192: Add AD7194 support

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Date: Wed, 28 Feb 2024 13:31:41 -0600
From: David Lechner <dlechner@...libre.com>
To: Alisa-Dariana Roman <alisadariana@...il.com>
Cc: michael.hennerich@...log.com, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, lars@...afoo.de, 
	jic23@...nel.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, 
	conor+dt@...nel.org, andriy.shevchenko@...ux.intel.com, nuno.sa@...log.com, 
	alisa.roman@...log.com
Subject: Re: [PATCH v4 3/4] dt-bindings: iio: adc: ad7192: Add AD7194 support

On Wed, Feb 28, 2024 at 6:26 AM Alisa-Dariana Roman
<alisadariana@...il.com> wrote:
>
> Unlike the other AD719Xs, AD7194 has configurable differential
> channels. The default configuration for these channels can be changed
> from the devicetree.
>
> Also add an example for AD7194 devicetree.
>
> Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
> Signed-off-by: romandariana <alisa.roman@...log.com>

Why two SOBs with the same email?

> ---
>  .../bindings/iio/adc/adi,ad7192.yaml          | 75 +++++++++++++++++++
>  1 file changed, 75 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> index 16def2985ab4..c62862760311 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> @@ -21,8 +21,15 @@ properties:
>        - adi,ad7190
>        - adi,ad7192
>        - adi,ad7193
> +      - adi,ad7194
>        - adi,ad7195
>
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
>    reg:
>      maxItems: 1
>

Based on the discussion in v3, I was expecting to see an aincom-supply
property added. (Although that probably belongs in a separate patch
since it applies to all existing chips, not just the one being added
here.)


> @@ -96,8 +103,44 @@ required:
>    - spi-cpol
>    - spi-cpha
>
> +patternProperties:
> +  "^channel@([0-9]+)$":
> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        description: The channel index.
> +        minimum: 1
> +        maximum: 16

I guess this is OK, but max of 16 is a bit artificial since there
could be unusual use cases where inputs are reused on multiple
channels. Technically, there are 16 * 17 = 272 possible combinations
that could appear.