linux-kernel - Re: [PATCH v5 1/2] dt-bindings: adc: provide max34408/9 device tree binding document

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Message-ID: <e7b74daa9d0131246fd10f47aa4128bc8f8f3177.camel@gmail.com>
Date:   Thu, 12 Oct 2023 19:27:33 +0300
From:   Ivan Mikhaylov <fr0st61te@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/2] dt-bindings: adc: provide max34408/9 device tree
 binding document

On Thu, 2023-10-12 at 08:40 +0100, Jonathan Cameron wrote:
> On Tue, 10 Oct 2023 23:22:48 +0300
> Ivan Mikhaylov <fr0st61te@...il.com> wrote:
> 
> > On Tue, 2023-10-10 at 15:40 +0100, Jonathan Cameron wrote:
> > > On Sun,  8 Oct 2023 02:48:37 +0300
> > > Ivan Mikhaylov <fr0st61te@...il.com> wrote:
> > >   
> > > > The hardware binding for i2c current monitoring device with
> > > > overcurrent
> > > > control.
> > > > 
> > > > Signed-off-by: Ivan Mikhaylov <fr0st61te@...il.com>
> > > > ---
> > > >  .../bindings/iio/adc/maxim,max34408.yaml      | 141
> > > > ++++++++++++++++++
> > > >  1 file changed, 141 insertions(+)
> > > >  create mode 100644
> > > > Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml
> > > > b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml
> > > > new file mode 100644
> > > > index 000000000000..9749f1fd1802
> > > > --- /dev/null
> > > > +++
> > > > b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml
> > > > @@ -0,0 +1,141 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > > +%YAML 1.2
> > > > +---
> > > > +$id:
> > > > http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Two- and four-channel current monitors with overcurrent
> > > > control
> > > > +
> > > > +maintainers:
> > > > +  - Ivan Mikhaylov <fr0st61te@...il.com>
> > > > +
> > > > +description: |
> > > > +  The MAX34408/MAX34409 are two- and four-channel current
> > > > monitors
> > > > that are
> > > > +  configured and monitored with a standard I2C/SMBus serial
> > > > interface. Each
> > > > +  unidirectional current sensor offers precision high-side
> > > > operation with a
> > > > +  low full-scale sense voltage. The devices automatically
> > > > sequence
> > > > through
> > > > +  two or four channels and collect the current-sense samples
> > > > and
> > > > average them
> > > > +  to reduce the effect of impulse noise. The raw ADC samples
> > > > are
> > > > compared to
> > > > +  user-programmable digital thresholds to indicate overcurrent
> > > > conditions.
> > > > +  Overcurrent conditions trigger a hardware output to provide
> > > > an
> > > > immediate
> > > > +  indication to shut down any necessary external circuitry.
> > > > +
> > > > +  Specifications about the devices can be found at:
> > > > + 
> > > > https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    enum:
> > > > +      - maxim,max34408
> > > > +      - maxim,max34409
> > > > +
> > > > +  "#address-cells":
> > > > +    const: 1
> > > > +
> > > > +  "#size-cells":
> > > > +    const: 0
> > > > +
> > > > +  reg:
> > > > +    maxItems: 1
> > > > +
> > > > +  interrupts:
> > > > +    maxItems: 1
> > > > +
> > > > +  powerdown-gpios:
> > > > +    description:
> > > > +      Shutdown Output. Open-drain output. This output
> > > > transitions
> > > > to high impedance
> > > > +      when any of the digital comparator thresholds are
> > > > exceeded
> > > > as long as the ENA
> > > > +      pin is high.
> > > > +    maxItems: 1
> > > > +
> > > > +  shtdn-enable-gpios:  
> > > 
> > > I guess the review crossed with you sending v5.  There is some
> > > feedback on v4 you need
> > > to address here.  
> > 
> > Jonathan, I thought I did, I've changed ena to powerdown-gpios from
> > Krzysztof's comments but about this one pin I'm still not sure, it
> > looks like *-enable-gpios (like in *-enable-gpios pins in
> > iio/frequency/adi,adf4377.yaml) pin or is it not? Or maybe any
> > other
> > suggestions about naming of this one?
> > 
> > Thanks.
> 
> shutdown-gpios and make the sense (active high / low) such that
> setting
> it results in teh device being shut down.
> Or treat it as an enable and enable-gpios
> 
> Something that indicates both shutdown and enable is confusing ;)
> 
> Jonathan


Jonathan, then I make these changes:

powerdown-gpios: -> output-enable:
shtdn-enable-gpios: -> enable-gpios:

Is it ok?

Thanks.