linux-kernel - Re: [PATCH v2 2/8] dt-bindings: iio: adc: adi,ad4030: Reference spi-peripheral-props

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Message-ID: <f7d7f400-cc43-41d9-bc97-39d308363f14@baylibre.com>
Date: Thu, 18 Sep 2025 14:39:01 -0500
From: David Lechner <dlechner@...libre.com>
To: Marcelo Schmitt <marcelo.schmitt@...log.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: jic23@...nel.org, michael.hennerich@...log.com, nuno.sa@...log.com,
 eblanc@...libre.com, andy@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, corbet@....net, marcelo.schmitt1@...il.com
Subject: Re: [PATCH v2 2/8] dt-bindings: iio: adc: adi,ad4030: Reference
 spi-peripheral-props

On 9/18/25 12:38 PM, Marcelo Schmitt wrote:
> AD4030 and similar devices all connect to the system as SPI peripherals.
> Reference spi-peripheral-props so common SPI peripheral can be used from
> ad4030 dt-binding.
> 
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
> ---
>  Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> index 54e7349317b7..a8fee4062d0e 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
> @@ -20,6 +20,8 @@ description: |
>    * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-24_ad4632-24.pdf
>    * https://www.analog.com/media/en/technical-documentation/data-sheets/ad4630-16-4632-16.pdf
>  
> +$ref: /schemas/spi/spi-peripheral-props.yaml#

I think this is already referenced for all child nodes of a SPI
controller because of pattern matching of:

patternProperties:
  "^.*@[0-9a-f]+$":
    type: object
    $ref: spi-peripheral-props.yaml

in Documentation/devicetree/bindings/spi/spi-controller.yaml

So perhaps not strictly necessary?

Would be curious to know if there is some difference.

> +
>  properties:
>    compatible:
>      enum: