linux-kernel - Re: [PATCH 2/7] dt-bindings: iio: amplifiers: Add AD8366 support

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Message-ID: <20260121-merciful-exotic-panther-eca1b0@quoll>
Date: Wed, 21 Jan 2026 09:10:40 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Rodrigo Alencar <rodrigo.alencar@...log.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
	devicetree@...r.kernel.org, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron <jic23@...nel.org>, 
	David Lechner <dlechner@...libre.com>, Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH 2/7] dt-bindings: iio: amplifiers: Add AD8366 support

On Mon, Jan 19, 2026 at 02:36:56PM +0000, Rodrigo Alencar wrote:
> Add device tree binding documentation for amplifiers and digital
> attenuators. This covers different device variants with similar
> SPI control.
> 
> Signed-off-by: Rodrigo Alencar <rodrigo.alencar@...log.com>
> ---
>  .../bindings/iio/amplifiers/adi,ad8366.yaml        | 85 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 86 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml b/Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml
> new file mode 100644
> index 000000000000..7477bb9b5071
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml
> @@ -0,0 +1,85 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/amplifiers/adi,ad8366.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: AD8366, similar Gain Amplifiers and Digital Attenuators

s/,/and/

> +
> +maintainers:
> +  - Michael Hennerich <michael.hennerich@...log.com>
> +  - Rodrigo Alencar <rodrigo.alencar@...log.com>
> +
> +description: |

Do not need '|' unless you need to preserve formatting.

> +  Digital Variable Gain Amplifiers (VGAs) and Digital Attenuators with
> +  SPI interface.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad8366
> +      - adi,ada4961
> +      - adi,adl5240
> +      - adi,adrf5720
> +      - adi,adrf5730
> +      - adi,adrf5731
> +      - adi,hmc271a
> +      - adi,hmc792a
> +      - adi,hmc1018a
> +      - adi,hmc1019a
> +      - adi,hmc1119
> +
> +  reg:
> +    maxItems: 1
> +
> +  vcc-supply:
> +    description: Regulator that provides power to the device.
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO pin used to reset the device.

Drop description, redundant, said nothing more other than what property
already said. This cannot be a something else than GPIO and cannot be
used for something else than resetting device.

> +
> +  enable-gpios:
> +    maxItems: 1
> +    description:
> +      GPIO pin used to enable the device.

Drop description.

> +
> +required:
> +  - compatible
> +  - reg
> +  - vcc-supply
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      amplifier@0 {
> +        compatible = "adi,ad8366";
> +        reg = <0>;
> +        spi-max-frequency = <1000000>;
> +        vcc-supply = <&vcc_3v3>;
> +      };
> +    };
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {

Drop second example. It's the same as first.

Best regards,
Krzysztof