linux-kernel - Re: [PATCH v3 10/13] dt-bindings: iio: Add AD7091R-8

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Message-ID: <CAMknhBHxmWTAR-F-92kFW8wbKPn2qnr7v2Sk2xUwA9AmONo+3w@mail.gmail.com>
Date:   Fri, 8 Dec 2023 08:50:17 -0600
From:   David Lechner <dlechner@...libre.com>
To:     Marcelo Schmitt <marcelo.schmitt1@...il.com>
Cc:     Marcelo Schmitt <marcelo.schmitt@...log.com>, apw@...onical.com,
        joe@...ches.com, dwaipayanray1@...il.com, lukas.bulwahn@...il.com,
        paul.cercueil@...log.com, Michael.Hennerich@...log.com,
        lars@...afoo.de, jic23@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        dan.carpenter@...aro.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 10/13] dt-bindings: iio: Add AD7091R-8

On Fri, Dec 8, 2023 at 7:28 AM Marcelo Schmitt
<marcelo.schmitt1@...il.com> wrote:
>
> Hi David, thank you for your suggestions.
> Comments inline.
>
> On 12/07, David Lechner wrote:
> > On Thu, Dec 7, 2023 at 12:42 PM Marcelo Schmitt
> > <marcelo.schmitt@...log.com> wrote:
> > >
> > > Add device tree documentation for AD7091R-8.
> > >
> > > Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
> > > ---
> > >  .../bindings/iio/adc/adi,ad7091r8.yaml        | 99 +++++++++++++++++++
> > >  1 file changed, 99 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
> > > new file mode 100644
> > > index 000000000000..02320778f225
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7091r8.yaml
> > > @@ -0,0 +1,99 @@
> > > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/iio/adc/adi,ad7091r8.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Analog Devices AD7091R8 8-Channel 12-Bit ADC
> > > +
> > > +maintainers:
> > > +  - Marcelo Schmitt <marcelo.schmitt@...log.com>
> > > +
> > > +description: |
> > > +  Analog Devices AD7091R-8 8-Channel 12-Bit ADC
> > > +  https://www.analog.com/media/en/technical-documentation/data-sheets/AD7091R-2_7091R-4_7091R-8.pdf
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - adi,ad7091r2
> > > +      - adi,ad7091r4
> > > +      - adi,ad7091r8
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> >
> > Missing other supplies? Like vdd-supply and vdrive-supply?
> >
>
> I used the name that would work with ad7091r-base.c.
> If I'm not misinterpreting the datasheet, vdd-supply and vdrive-supply are
> for powering the ADC and setting SPI lanes logic level, respectively.
> They don't have any impact on ADC readings.

The guidelines [1] say that bindings should be complete even if the
feature is not used. In the most recent bindings I have submitted,
Jonathan specifically called out making sure all supplies were
included in the bindings. So I would assume the same applies here.

[1]: https://www.kernel.org/doc/html/latest/devicetree/bindings/writing-bindings.html

> By the way, should maybe I extend ad7091r5 dt doc instead of creating this
> new one?

If it is pin-compatible or 90% the same, then perhaps.