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Message-ID: <5d387011-7560-48ac-8f92-bfe0fda7e71e@baylibre.com>
Date: Fri, 5 Sep 2025 12:06:36 -0500
From: David Lechner <dlechner@...libre.com>
To: Jonathan Santos <Jonathan.Santos@...log.com>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: lars@...afoo.de, jic23@...nel.org, nuno.sa@...log.com, andy@...nel.org,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
marcelo.schmitt1@...il.com, jonath4nns@...il.com
Subject: Re: [PATCH v3 1/4] dt-bindings: iio: adc: ad7768-1: add new supported
parts
On 9/5/25 4:49 AM, Jonathan Santos wrote:
> Add compatibles for supported parts in the ad7768-1 family:
> ADAQ7767-1, ADAQ7768-1 and ADAQ7769-1
>
> Add property and checks for AFF gain, supported by ADAQ7767-1
> and ADAQ7769-1 parts:
> adi,aaf-gain-bp
>
> Signed-off-by: Jonathan Santos <Jonathan.Santos@...log.com>
> ---
> v3 Changes:
> * Renamed adi,gain-milli to adi,aaf-gain-bp. Now it represents basis points
> (one hundredth of a percent) as suggested by Krzysztof. Description was
> adjusted.
> Note: permille (1/1000) was also suggested as unit for this property.
>
> v2 Changes:
> * adi,aaf-gain property renamed to adi,gain-milli. Description was
> simplified.
> * default value add to adi,gain-milli.
> ---
> .../bindings/iio/adc/adi,ad7768-1.yaml | 44 +++++++++++++++++--
> 1 file changed, 40 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
> index c06d0fc791d3..c2ad8e585586 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
> @@ -4,18 +4,26 @@
> $id: http://devicetree.org/schemas/iio/adc/adi,ad7768-1.yaml#
> $schema: http://devicetree.org/meta-schemas/core.yaml#
>
> -title: Analog Devices AD7768-1 ADC device driver
> +title: Analog Devices AD7768-1 ADC family
>
> maintainers:
> - Michael Hennerich <michael.hennerich@...log.com>
>
> description: |
> - Datasheet at:
> - https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
> + Analog Devices AD7768-1 24-Bit Single Channel Low Power sigma-delta ADC family
> +
> + https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
> + https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7767-1.pdf
> + https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7768-1.pdf
> + https://www.analog.com/media/en/technical-documentation/data-sheets/adaq7769-1.pdf
Only adding one property seems a bit incomplete give that the ADAQs have
significantly more pins that the regular ADC.
E.g different/more power supplies; gain-gpios, fda-gpios (or don't allow
gpio-controller if we can assume GAINx and FAx are always wired to back to the
ADC and not coming from somewhere else).
>
> properties:
> compatible:
> - const: adi,ad7768-1
> + enum:
> + - adi,ad7768-1
> + - adi,adaq7767-1
> + - adi,adaq7768-1
> + - adi,adaq7769-1
>
> reg:
> maxItems: 1
> @@ -58,6 +66,19 @@ properties:
> description:
> ADC reference voltage supply
>
> + adi,aaf-gain-bp:
> + description: |
> + Specifies the gain applied by the Analog Anti-Aliasing Filter (AAF)
> + to the ADC input in basis points (one hundredth of a percent).
> + The hardware gain is determined by which input pin(s) the signal goes
> + through into the AAF. The possible connections are:
> + * For the ADAQ7767-1: Input connected to IN1±, IN2± or IN3±.
> + * For the ADAQ7769-1: OUT_PGA pin connected to IN1_AAF+, IN2_AAF+,
> + or IN3_AAF+.
> + $ref: /schemas/types.yaml#/definitions/uint16
> + enum: [1430, 3640, 10000]
> + default: 10000
> +
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