linux-kernel - Re: [PATCH 1/2] bindings: iio: adc: Add max11205 documentation file

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Message-ID: <33eb031c-f1b5-b80d-52b0-48bcab02d697@linaro.org>
Date:   Wed, 24 Aug 2022 16:07:41 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ramona Bolboaca <ramona.bolboaca@...log.com>, jic23@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] bindings: iio: adc: Add max11205 documentation file

On 24/08/2022 15:52, Ramona Bolboaca wrote:
> Add bindings documentation file and MAINTAINERS entry for MAX11205.
> 
> Signed-off-by: Ramona Bolboaca <ramona.bolboaca@...log.com>
> ---
>  .../bindings/iio/adc/maxim,max11205.yaml      | 65 +++++++++++++++++++
>  MAINTAINERS                                   |  8 +++
>  2 files changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/maxim,max11205.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/maxim,max11205.yaml b/Documentation/devicetree/bindings/iio/adc/maxim,max11205.yaml
> new file mode 100644
> index 000000000000..bddd18a44969
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/maxim,max11205.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/maxim,max11205.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim MAX11205 ADC
> +
> +maintainers:
> +  - Ramona Bolboaca <ramona.bolboaca@...log.com>
> +
> +description: |
> +  The MAX11205 is an ultra-low-power (< 300FA max
> +  active current), high-resolution, serial-output ADC.
> +
> +  https://datasheets.maximintegrated.com/en/ds/MAX11205.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - maxim,max11205a
> +      - maxim,max11205b
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 5000000
> +
> +  spi-cpha: true

Both properties are good, but still you should reference
/schemas/spi/spi-peripheral-props.yaml in allOf and use
unevaluatedProperties:false. See other bindings for SPI devices.

> +
> +  vref-supply:
> +    description:
> +      The regulator supply for the ADC reference voltage.
> +
> +required:
> +  - compatible
> +  - reg
> +  - spi-max-frequency
> +  - spi-cpha
> +  - interrupts
> +  - vref-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        max11205@0 {

adc
Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +                      compatible = "maxim,max11205a";

Messed up indentation. Use 4 spaces.

> +                      reg = <0>;
> +                      spi-max-frequency = <5000000>;
> +                      spi-cpha;

Best regards,
Krzysztof