linux-kernel - Re: [PATCH 5/8] dt-bindings: iio: add sigma delta modulator backend

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Date: Tue, 18 Jun 2024 19:13:42 +0100
From: Conor Dooley <conor@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] dt-bindings: iio: add sigma delta modulator backend

On Tue, Jun 18, 2024 at 06:08:31PM +0200, Olivier Moysan wrote:
> Add documentation of device tree bindings to support
> sigma delta modulator backend in IIO framework.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> ---
>  .../iio/adc/sd-modulator-backend.yaml         | 43 +++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml b/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml
> new file mode 100644
> index 000000000000..b0fa71b75cd0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/sd-modulator-backend.yaml
> @@ -0,0 +1,43 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/sd-modulator-backend.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sigma delta modulator backend
> +
> +maintainers:
> +  - Olivier Moysan <olivier.moysan@...s.st.com>
> +
> +properties:
> +  compatible:
> +    description: |
> +      "sd-backend" can be used as a generic SD modulator backend,
> +      if the modulator is not specified in the compatible list.
> +    enum:
> +      - sd-backend

I'd rather not have a generic compatible like this. Something generic as
a fallback for the driver to binding against I would be fine with, but
not something that avoids people documenting their devices.

Also, I think "backend" should be dropped from the
filename/title/descriptions, the ads1201 is "just" an delta-sigma
modulator.:wq

> +      - ads1201

Missing vendor prefix.

Thanks,
Conor.


> +
> +  '#io-backend-cells':
> +    const: 0
> +
> +  reg:
> +    maxItems: 1
> +
> +  vref-supply:
> +    description: Phandle to the vref input analog reference voltage.
> +
> +required:
> +  - compatible
> +  - '#io-backend-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    ads1201: adc {
> +      compatible = "sd-backend";
> +      #io-backend-cells = <0>;
> +    };
> +
> +...
> -- 
> 2.25.1
> 

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