linux-kernel - Re: [PATCH v3 5/6] dt-bindings: iio: adc: Add AD4000

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Date: Fri, 7 Jun 2024 11:35:44 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: Marcelo Schmitt <marcelo.schmitt@...log.com>, broonie@...nel.org,
	lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, nuno.sa@...log.com, dlechner@...libre.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] dt-bindings: iio: adc: Add AD4000

On 06/05, Conor Dooley wrote:
> On Tue, Jun 04, 2024 at 07:43:53PM -0300, Marcelo Schmitt wrote:
> > Add device tree documentation for AD4000 series of ADC devices.
> > 
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4000-4004-4008.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4001-4005.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4002-4006-4010.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4003-4007-4011.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4020-4021-4022.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4001.pdf
> > Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4003.pdf
> > 
> > Suggested-by: David Lechner <dlechner@...libre.com>
> 
> A suggested-by on a binding? That's unusual...
> 
> > Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
> > ---
> > Even though didn't pick all suggestions to the dt-bindings, I did pick most them
> > so kept David's Suggested-by tag.
> > 
> >  .../bindings/iio/adc/adi,ad4000.yaml          | 207 ++++++++++++++++++
> >  MAINTAINERS                                   |   7 +
> >  2 files changed, 214 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml
> > new file mode 100644
> > index 000000000000..7470d386906b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4000.yaml
> > @@ -0,0 +1,207 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/adc/adi,ad4000.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analog Devices AD4000 and similar Analog to Digital Converters
> > +
> > +maintainers:
> > +  - Marcelo Schmitt <marcelo.schmitt@...log.com>
> > +
> > +description: |
> > +  Analog Devices AD4000 family of Analog to Digital Converters with SPI support.
> > +  Specifications can be found at:
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad4000-4004-4008.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad4001-4005.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad4002-4006-4010.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad4003-4007-4011.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/ad4020-4021-4022.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4001.pdf
> > +    https://www.analog.com/media/en/technical-documentation/data-sheets/adaq4003.pdf
> > +
> > +$ref: /schemas/spi/spi-peripheral-props.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - adi,ad4000
> > +      - adi,ad4001
> > +      - adi,ad4002
> > +      - adi,ad4003
> > +      - adi,ad4004
> > +      - adi,ad4005
> > +      - adi,ad4006
> > +      - adi,ad4007
> > +      - adi,ad4008
> > +      - adi,ad4010
> > +      - adi,ad4011
> > +      - adi,ad4020
> > +      - adi,ad4021
> > +      - adi,ad4022
> > +      - adi,adaq4001
> > +      - adi,adaq4003
> 
> Are all these actually incompatible? I'd like a note in the commit
> message as to why that's the case. A quick look at the driver showed
> that the differences in the driver between the ad402{0,1,2} are limited
> to the "dev_name". Same went for some other devices, like the
> ad40{02,06,10}.

Yes, that's correct. Some chips only vary by name and max sample rate which
boils down to only having a different dev_name in the driver.
Can those have grouped compatible strings?
dt_binding_check fails if curly brackets are used.
properties:
  compatible:
    enum:
      - adi,ad402{0,1,2}

The groups of similar chips are:
AD4020/AD4021/AD4022
AD4003/AD4007/AD4011
AD4002/AD4006/AD4010
AD4001/AD4005
AD4000/AD4004/AD4008

Thanks,
Marcelo

> 
> Thanks,
> Conor.