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Message-ID: <20231116-spousal-mystify-dcd1d4fec7e6@squawk>
Date: Thu, 16 Nov 2023 17:54:13 +0000
From: Conor Dooley <conor@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: mitrutzceclan <mitrutzceclan@...il.com>, linus.walleij@...aro.org,
brgl@...ev.pl, andy@...nel.org, linux-gpio@...r.kernel.org,
Lars-Peter Clausen <lars@...afoo.de>,
Jonathan Cameron <jic23@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Michael Walle <michael@...le.cc>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Arnd Bergmann <arnd@...db.de>,
ChiaEn Wu <chiaen_wu@...htek.com>,
Niklas Schnelle <schnelle@...ux.ibm.com>,
Leonard Göhrs <l.goehrs@...gutronix.de>,
Mike Looijmans <mike.looijmans@...ic.nl>,
Haibo Chen <haibo.chen@....com>,
Hugo Villeneuve <hvilleneuve@...onoff.com>,
Ceclan Dumitru <dumitru.ceclan@...log.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: adc: add AD7173
On Thu, Nov 16, 2023 at 03:54:13PM +0100, Krzysztof Kozlowski wrote:
> On 16/11/2023 14:46, mitrutzceclan wrote:
> > From: Dumitru Ceclan <mitrutzceclan@...il.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@...rochip.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.
yeah, this is vastly different from what I reviewed. I suppose if
someone finds it necessary to add a "# except foo" to the end of a tag
it is very good signifier that the tag should in fact be removed.
>
> > Signed-off-by: Dumitru Ceclan <mitrutzceclan@...il.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@...log.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
I really don't like these properties where integers are mapped to
functionalities like this. I'd much rather see a enum of strings where
the meaning for these things can be put in & there's no need to look up
the binding to figure out what "adi,reference-select = <3>" means.
For example having "refin", "refin2", "refout-avss" & "avdd" as the
options and therefore "adi,reference-select = "avdd" in a devicetree is
a lot more understandable IMO.
Cheers,
Conor.
> > +
> > + 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
>
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