linux-kernel - Re: [PATCH v2 2/6] dt-bindings: iio: amplifiers: Add AD8366 support

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Message-ID: <20260126-porous-hurdle-bfc510f113bb@spud>
Date: Mon, 26 Jan 2026 20:11:18 +0000
From: Conor Dooley <conor@...nel.org>
To: 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 v2 2/6] dt-bindings: iio: amplifiers: Add AD8366 support

On Mon, Jan 26, 2026 at 01:51:03PM +0000, Rodrigo Alencar via B4 Relay wrote:
> From: Rodrigo Alencar <rodrigo.alencar@...log.com>
> 
> 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        | 68 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 69 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..02f790fd73d7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml
> @@ -0,0 +1,68 @@
> +# 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 and similar Gain Amplifiers and Digital Attenuators
> +
> +maintainers:
> +  - Michael Hennerich <michael.hennerich@...log.com>
> +  - Rodrigo Alencar <rodrigo.alencar@...log.com>
> +
> +description:
> +  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

Why do none of these devices use fallback compatibles? Please put the
rationale in the commit message.

> +
> +  reg:
> +    maxItems: 1
> +
> +  vcc-supply:
> +    description: Regulator that provides power to the device.
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  enable-gpios:
> +    maxItems: 1

How come enable-gpios is optional? Is it optional on all devices?
Do all devices support enable-gpios and/or reset-gpios?

Cheers,
Conor.

> +
> +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>;
> +      };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8b5bb7030fa6..c3403ae478b7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1589,6 +1589,7 @@ M:	Rodrigo Alencar <rodrigo.alencar@...log.com>
>  L:	linux-iio@...r.kernel.org
>  S:	Supported
>  W:	https://ez.analog.com/linux-software-drivers
> +F:	Documentation/devicetree/bindings/iio/amplifiers/adi,ad8366.yaml
>  F:	drivers/iio/amplifiers/ad8366.c
>  
>  ANALOG DEVICES INC AD9467 DRIVER
> 
> -- 
> 2.43.0
> 
> 

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