linux-kernel - Re: [PATCH v3 2/2] dt-bindings: iio: adc: add Texas Instruments ADS7924

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Message-Id: <20230115112205.e46ab8d017b99dd987d003e4@hugovil.com>
Date:   Sun, 15 Jan 2023 11:22:05 -0500
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     hvilleneuve@...onoff.com, jic23@...nel.org, lars@...afoo.de,
        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 v3 2/2] dt-bindings: iio: adc: add Texas Instruments
 ADS7924

On Sun, 15 Jan 2023 15:57:21 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 13/01/2023 20:49, Hugo Villeneuve wrote:
> > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > 
> > Add device tree bindings document for the Texas Instruments ADS7924
> > ADC.
> > 
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > ---
> >  .../bindings/iio/adc/ti,ads7924.yaml          | 112 ++++++++++++++++++
> >  1 file changed, 112 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> > new file mode 100644
> > index 000000000000..24bbf95383b4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7924.yaml
> > @@ -0,0 +1,112 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/adc/ti,ads7924.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: TI ADS7924 4 channels 12 bits I2C analog to digital converter
> > +
> > +maintainers:
> > +  - Hugo Villeneuve <hvilleneuve@...onoff.com>
> > +
> > +description: |
> > +  Texas Instruments ADS7924 4 channels 12 bits I2C analog to digital converter
> > +
> > +  Specifications:
> > +    https://www.ti.com/lit/gpn/ads7924
> > +
> > +properties:
> > +  compatible:
> > +    const: ti,ads7924
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  vref-supply:
> > +    description:
> > +      The regulator supply for the ADC reference voltage (AVDD)
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  "#address-cells":
> > +    const: 1
> > +
> > +  "#size-cells":
> > +    const: 0
> > +
> > +  "#io-channel-cells":
> > +    const: 1
> > +
> > +patternProperties:
> > +  "^channel@[0-3]+$":
> > +    $ref: adc.yaml
> > +
> > +    description: |
> > +      Represents the external channels which are connected to the ADC.
> > +
> > +    properties:
> > +      reg:
> > +        description: |
> > +          The channel number. It can have up to 4 channels numbered from 0 to 3.
> > +        items:
> > +          - minimum: 0
> > +            maximum: 3
> > +
> > +      label:
> > +        description: |
> > +          Unique name to identify the channel.
> 
> Drop description, it's coming from adc.yaml. Just "label: true"

Done.

> > +
> > +    required:
> > +      - reg
> > +
> > +    additionalProperties: false
> 
> You are not allowing anything else from adc.yaml. Is it on purpose?

I am really not an expert with this Yaml stuff, and reading the documentation makes me probably more confused than before reading it :)

But one thing that is for sure is that these other properties in adc.yaml are not used in my driver:

  bipolar
  diff-channels
  settling-time-us
  oversampling-ratio

So is it Ok then to use "additionalProperties: false"? I think so, but what is your recommandation?

Thank you,
Hugo.


> > +
> > +additionalProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - vref-supply
> > +  - "#address-cells"
> > +  - "#size-cells"
> > +
> 
> Best regards,
> Krzysztof
> 
> 


-- 
Hugo Villeneuve <hugo@...ovil.com>