linux-kernel - Re: [PATCH v4 5/8] dt-bindings: iio: add backend support to sd modulator

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Message-ID: <20240704-semifinal-lining-8ed34ec648ce@spud>
Date: Thu, 4 Jul 2024 17:36:07 +0100
From: Conor Dooley <conor@...nel.org>
To: Olivier Moysan <olivier.moysan@...s.st.com>
Cc: fabrice.gasnier@...s.st.com, 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>,
	Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/8] dt-bindings: iio: add backend support to sd
 modulator

On Thu, Jul 04, 2024 at 05:53:33PM +0200, Olivier Moysan wrote:
> The legacy sd modulator driver registers the sigma delta modulator as
> an IIO channel provider. This implementation is not convenient when the
> SD modulator has to be cascaded with another IIO device. The scaling
> information is distributed across devices, which makes it difficult to
> report consistent scaling data on IIO devices.
> 
> The solution is to expose these cascaded IIO devices as an aggregate
> device, which report global scaling information.
> Add IIO backend support to SD modulator to allow scaling information
> management.
> 
> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com

The backend portion of this looks fine to me, thanks.

>
> ---
>  .../iio/adc/sigma-delta-modulator.yaml        | 23 +++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> index cab0d425eaa4..3f682d95d807 100644
> --- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
> @@ -18,18 +18,37 @@ properties:
>        - sd-modulator
>        - ads1201
>  
> +  '#io-backend-cells':
> +    const: 0
> +
>    '#io-channel-cells':
>      const: 0
>  
> +  reg:
> +    maxItems: 1
> +
> +  vref-supply:
> +    description: Phandle to the vref input analog reference voltage.

These two look like unrelated changes that should be done in their own
patch. They certainly deserve a justification.

Cheers,
Conor.

> +
>  required:
>    - compatible
> -  - '#io-channel-cells'
> +
> +anyOf:
> +  - required: ['#io-backend-cells']
> +  - required: ['#io-channel-cells']
>  
>  additionalProperties: false
>  
>  examples:
>    - |
> -    ads1202: adc {
> +    // Backend binding example. SD modulator configured as an IIO backend device
> +    ads1201_0 {
> +      compatible = "sd-modulator";
> +      #io-backend-cells = <0>;
> +    };
> +
> +    // Legacy binding example. SD modulator configured as an IIO channel provider
> +    ads1201_1 {
>        compatible = "sd-modulator";
>        #io-channel-cells = <0>;
>      };
> -- 
> 2.25.1
> 

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