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

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Message-ID: <20230930170404.515395b1@jic23-huawei>
Date:   Sat, 30 Sep 2023 17:04:04 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Ivan Mikhaylov <fr0st61te@...il.com>
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 1/2] dt-bindings: adc: provide max34408/9 device tree
 binding document

On Mon, 25 Sep 2023 19:48:39 +0300
Ivan Mikhaylov <fr0st61te@...il.com> wrote:

> On Sun, 2023-09-24 at 13:53 +0100, Jonathan Cameron wrote:
> > On Mon, 18 Sep 2023 00:11:42 +0300
> > Ivan Mikhaylov <fr0st61te@...il.com> wrote:
> >   
> > > The i2c driver with Rsense option for current monitoring.
> > > 
> > > Signed-off-by: Ivan Mikhaylov <fr0st61te@...il.com>  
> > 
> > Hi Ivan,
> > 
> > Welcome to IIO!
> > 
> > Looks good, but there are a few things I'd add to make this describe
> > the device
> > a little more fully and flexibly.  Ideally we want a binding to fully
> > describe
> > a device, even if the particular driver for Linux doesn't use all the
> > features.
> > Some are easy though such as enabling regulators (that are probably
> > turned on
> > already on your board)
> > 
> > Thanks,
> > 
> > Jonathan
> >   
> > > ---
> > >  .../bindings/iio/adc/maxim,max34408.yaml      | 63
> > > +++++++++++++++++++
> > >  1 file changed, 63 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..ae7c6ddb13d8
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml
> > > @@ -0,0 +1,63 @@
> > > +# 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
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  maxim,rsense-val-micro-ohms:  
> > From the datasheet you link, it looks like this could be different
> > for
> > the inputs?  
> 
> Hi Jonathan, "maxim,input1-rsense-val-micro-ohms", "maxim,input2-
> rsense-val-micro-ohms" and etc would be better?

Sorry, missed this during the week (too many emails at work!)

Anyhow, I'd have suggested an array, but a better suggestion was
made anyway in reply to your v2.