linux-kernel - Re: [PATCH v2 4/5] dt-bindings: iio: adc: adi,ad7606: add gain calibration support

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Message-ID: <8ff3f1da-f868-4c7e-9123-00a3c54904d5@baylibre.com>
Date: Fri, 2 May 2025 13:54:37 -0500
From: David Lechner <dlechner@...libre.com>
To: Angelo Dureghello <adureghello@...libre.com>,
 Jonathan Cameron <jic23@...nel.org>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>,
 Lars-Peter Clausen <lars@...afoo.de>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/5] dt-bindings: iio: adc: adi,ad7606: add gain
 calibration support

On 5/2/25 8:27 AM, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Add gain calibration support by a per-channel resistor value.
> 
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
>  .../devicetree/bindings/iio/adc/adi,ad7606.yaml    | 29 ++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> index 29f12d650442b8ff2eb455306ce59a0e87867ddd..d4b8ea51f60be367e79a4db18d932cbca9c7dc91 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> @@ -204,6 +204,15 @@ patternProperties:
>            considered a bipolar differential channel. Otherwise it is bipolar
>            single-ended.
>  
> +      adi,rfilter-ohms:
> +        description:
> +          For ADCs that supports gain calibration, this property must be set to
> +          the value of the external RFilter resistor. Proper gain error
> +          correction is applied based on this value.
> +        default: 0
> +        minimum: 0
> +        maximum: 65536
> +
Max should be 64512.