Re: [PATCH v4 1/2] dt-bindings: adc: add AD7173

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: mitrutzceclan <mitrutzceclan@gmail.com>
Cc: linus.walleij@linaro.org, brgl@bgdev.pl, andy@kernel.org,
	linux-gpio@vger.kernel.org,
	"Lars-Peter Clausen" <lars@metafoo.de>,
	"Jonathan Cameron" <jic23@kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	"Conor Dooley" <conor+dt@kernel.org>,
	"Michael Walle" <michael@walle.cc>,
	"Andy Shevchenko" <andy.shevchenko@gmail.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"ChiaEn Wu" <chiaen_wu@richtek.com>,
	"Niklas Schnelle" <schnelle@linux.ibm.com>,
	"Leonard Göhrs" <l.goehrs@pengutronix.de>,
	"Mike Looijmans" <mike.looijmans@topic.nl>,
	"Haibo Chen" <haibo.chen@nxp.com>,
	"Hugo Villeneuve" <hvilleneuve@dimonoff.com>,
	"Ceclan Dumitru" <dumitru.ceclan@analog.com>,
	linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Conor Dooley" <conor.dooley@microchip.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: adc: add AD7173
Date: Thu, 16 Nov 2023 15:54:13 +0100	[thread overview]
Message-ID: <44cfcd9a-f139-479b-85ff-5fd23c9714b2@linaro.org> (raw)
In-Reply-To: <20231116134655.21052-1-user@HYB-hhAwRlzzMZb>

On 16/11/2023 14:46, mitrutzceclan wrote:
> From: Dumitru Ceclan <mitrutzceclan@gmail.com>
> 
> The AD7173 family offer a complete integrated Sigma-Delta ADC solution
> which can be used in high precision, low noise single channel applications
> or higher speed multiplexed applications. The Sigma-Delta ADC is intended
> primarily for measurement of signals close to DC but also delivers
> outstanding performance with input bandwidths out to ~10kHz.
> 
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> # except reference_select

Please drop the tag. You clearly did not test it, so it must be
re-reviewed. Do not send code which was not tested.

> Signed-off-by: Dumitru Ceclan <mitrutzceclan@gmail.com>
> ---
> V3 -> V4
>  - include supply attributes
>  - add channel attribute for selecting conversion reference
> 
>  .../bindings/iio/adc/adi,ad7173.yaml          | 166 ++++++++++++++++++
>  1 file changed, 166 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> new file mode 100644
> index 000000000000..92aa352b6653
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7173.yaml
> @@ -0,0 +1,166 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/adi,ad7173.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices AD7173 ADC device driver

Drop: device driver

Bindings are for hardware.

> +
> +maintainers:
> +  - Ceclan Dumitru <dumitru.ceclan@analog.com>
> +
> +description: |
> +  Bindings for the Analog Devices AD717X ADC's. Datasheets for supported chips:
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7172-2.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7173-8.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7175-2.pdf
> +    https://www.analog.com/media/en/technical-documentation/data-sheets/AD7176-2.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,ad7172-2
> +      - adi,ad7173-8
> +      - adi,ad7175-2
> +      - adi,ad7176-2
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  spi-max-frequency:
> +    maximum: 20000000
> +
> +  refin-supply:
> +    description: external reference supply, can be used as reference for conversion.
> +
> +  refin2-supply:
> +    description: external reference supply, can be used as reference for conversion.
> +
> +  avdd-supply:
> +    description: avdd supply, can be used as reference for conversion.
> +
> +  dependencies:

Nope, needs testing... See also example-schema.

> +    refin2-supply:
> +      properties:
> +        compatible:
> +          adi,ad7173-8
> +
> +  required:

Please open example schema and put it in similar place.

> +    - compatible
> +    - reg
> +    - interrupts
> +
> +patternProperties:
> +  "^channel@[0-9a-f]$":
> +    type: object
> +    $ref: adc.yaml
> +    unevaluatedProperties: false
> +
> +    properties:
> +      reg:
> +        minimum: 0
> +        maximum: 15
> +
> +      diff-channels:
> +        items:
> +          minimum: 0
> +          maximum: 31
> +
> +      adi,reference-select:
> +        description: |
> +          Select the reference source to use when converting on
> +          the specific channel. Valid values are:
> +          0: REFIN(+)/REFIN(−).
> +          1: REFIN2(+)/REFIN2(−)
> +          2: REFOUT/AVSS (Internal reference)
> +          3: AVDD
> +
> +          External reference 2 only available on ad7173-8.
> +          If not specified, internal reference used.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        enum: [0, 1, 2, 3]
> +        default: 2
> +
> +      bipolar:
> +        type: boolean
> +
> +    required:
> +      - reg
> +      - diff-channels
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: adi,ad7173-8
> +    then:

??? Maybe you want to use "not"?

> +    else:

> +      patternProperties:
> +        "^channel@[0-9a-f]$":
> +          properties:
> +            enum: [0, 2, 3]
> +
> +unevaluatedProperties: false
> +

Best regards,
Krzysztof