Re: [PATCH 2/4] dt-bindings: iio: adc: Add adi,ad4052

[Conor Dooley <conor@kernel.org>]

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On Thu, Mar 06, 2025 at 03:03:15PM +0100, Jorge Marques wrote:
> Add dt-bindings for AD4052 family, devices AD4050/AD4052/AD4056/AD4058,
> low-power with monitor capabilities SAR ADCs.
> Contain selectable oversampling and sample rate, the latter for both
> oversampling and monitor mode.
> The monitor capability is exposed as an IIO threshold either direction
> event.
> 
> Signed-off-by: Jorge Marques <jorge.marques@analog.com>
> ---
>  .../devicetree/bindings/iio/adc/adi,ad4052.yaml    | 80 ++++++++++++++++++++++
>  MAINTAINERS                                        |  6 ++
>  2 files changed, 86 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..4602f1f0184d58f33883852ff6d76933758825f1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2025 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad4052.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD4052 ADC family device driver
> +
> +maintainers:
> +  - Jorge Marques <jorge.marques@analog.com>
> +
> +description: |
> +  Analog Devices AD4052 Single Channel Precision SAR ADC family
> +
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4050.pdf
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ad4052.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad4050
> +      - adi,ad4052
> +      - adi,ad4056
> +      - adi,ad4058

Can you mention in your commit message what differs between these
devices that makes picking one as the "base"/fallback compatible
unsuitable please?

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      Reference clock
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: threshold events.
> +      - description: device ready and data ready.
> +
> +  cnv-gpios:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 62500000
> +
> +  vdd-supply: true
> +  vdd_1_8-supply: true

You're allowed to use . in property names, and the _s should be -s.
That said, vdd and vdd 1.8? Shouldn't both have the voltage in them in
that case?

> +  vio-supply: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@0 {
> +            compatible = "adi,ad4052";
> +            reg = <0>;
> +            spi-max-frequency = <25000000>;
> +
> +            interrupt-parent = <&gpio>;
> +            interrupts = <0 0 IRQ_TYPE_EDGE_RISING>,
> +                         <0 1 IRQ_TYPE_EDGE_RISING>;
> +            cnv-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
> +        };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 06f122cb8bbd15a0076c229dfc89be0b5126f237..fef8adaee888d59e1aa3b3592dda5a8bea0b7677 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1317,6 +1317,12 @@ F:	Documentation/devicetree/bindings/iio/adc/adi,ad4030.yaml
>  F:	Documentation/iio/ad4030.rst
>  F:	drivers/iio/adc/ad4030.c
>  
> +ANALOG DEVICES INC AD4052 DRIVER
> +M:	Jorge Marques <jorge.marques@analog.com>
> +S:	Supported
> +W:	https://ez.analog.com/linux-software-drivers
> +F:	Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml
> +
>  ANALOG DEVICES INC AD4130 DRIVER
>  M:	Cosmin Tanislav <cosmin.tanislav@analog.com>
>  L:	linux-iio@vger.kernel.org
> 
> -- 
> 2.48.1
> 

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