linux-kernel - Re: [PATCH v2 3/4] dt-bindings: iio: adc: add ad7405

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Message-ID: <20250508-brethren-rants-a3c80c091b45@spud>
Date: Thu, 8 May 2025 15:41:52 +0100
From: Conor Dooley <conor@...nel.org>
To: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Sergiu Cuciurean <sergiu.cuciurean@...log.com>,
	Dragos Bogdan <dragos.bogdan@...log.com>,
	Antoniu Miclaus <antoniu.miclaus@...log.com>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Tobias Sperling <tobias.sperling@...ting.com>,
	Alisa-Dariana Roman <alisadariana@...il.com>,
	Marcelo Schmitt <marcelo.schmitt@...log.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Ramona Alexandra Nechita <ramona.nechita@...log.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] dt-bindings: iio: adc: add ad7405

On Thu, May 08, 2025 at 03:30:56PM +0300, Pop Ioan Daniel wrote:
> Add devicetree bindings for ad7405/adum770x family.
> 
> Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
> ---
> changes in v2:
>  - remove  #address-cells and #size-cells
>  - add additionalProperties: false instead of unevaluatedProperties: false
>  - remove #include <dt-bindings/interrupt-controller/irq.h>
>    because it's not used
>  - add new line at the end of the file
>  - add mantainer
>  .../bindings/iio/adc/adi,ad7405.yaml          | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7405.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7405.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7405.yaml
> new file mode 100644
> index 000000000000..8c30a712968d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7405.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2025 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad7405.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD7405 family
> +
> +maintainers:
> +  - Dragos Bogdan <dragos.bogdan@...log.com>
> +  - Pop Ioan Daniel <pop.ioan-daniel@...log.com>
> +
> +description: |
> +  Analog Devices AD7405 is a high performance isolated ADC, 1-channel,
> +  16-bit with a second-order Σ-Δ modulator that converts an analog input signal
> +  into a high speed, single-bit data stream.
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad7405.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/adum7701.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/adum7702.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM7703.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad7405
> +      - adi,adum7701
> +      - adi,adum7702
> +      - adi,adum7703

These last three devices have the same match data, why is a fallback
compatible not appropriate? (Please list the reason in your commit
message).

> +
> +  vdd1-supply: true
> +
> +  vdd2-supply: true
> +
> +  clocks:
> +    maxitems: 1
> +
> +  io-backends:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - vdd1-supply
> +  - vdd2-supply
> +  - clocks
> +  - io-backends
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    adc {
> +        compatible = "adi,ad7405";
> +        clocks = <&axi_clk_gen 0>;
> +        vdd1-supply = <&vdd1>;
> +        vdd2-supply = <&vdd2>;
> +        io-backends = <&iio_backend>;
> +    };
> +...
> -- 
> 2.34.1
> 

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