linux-kernel - Re: [PATCH v3 2/5] dt-bindings: hwmon: Add possible new properties to max31827 bindings

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Message-ID: <20230915-battle-shrouded-9d7e9e3cd6c0@spud>
Date:   Fri, 15 Sep 2023 16:58:12 +0100
From:   Conor Dooley <conor@...nel.org>
To:     "Matyas, Daniel" <Daniel.Matyas@...log.com>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] dt-bindings: hwmon: Add possible new properties
 to max31827 bindings

On Fri, Sep 15, 2023 at 03:31:13PM +0000, Matyas, Daniel wrote:
> > -----Original Message-----
> > From: Conor Dooley <conor@...nel.org>
> > On Thu, Sep 14, 2023 at 10:59:45AM +0300, Daniel Matyas wrote:

> > > +  adi,alrm-pol:
> > 
> > Characters are not at a premium, is there a reason not to use the full
> > words? "flt-q" in particular would be quite cryptic if I saw it in a dts.
> > 
> > > +    description:
> > > +      Sets the alarms active state.
> > > +            - 0 = active low
> > > +            - 1 = active high
> > > +      For max31827 and max31828 the default alarm polarity is low. For
> > max31829
> > > +      it is high.
> > 
> > This constraint can be expressed in the binding, rather than in free form
> > text like done here. Ditto below.

> Ok, but how? The default values are different depending on the compatible string. I searched for similar examples, but I found nothing...
> 
> Some bindings use 'default: ' to declare the default values, but this is the default for every chip.

Something like
allOf:
  - if:
      properties:
        compatible:
          contains:
            const: adi,max31829
    then:
      properties:
        adi,alrm-pol:
          default: 1
    else:
      properties:
        adi,alrm-pol:
          default: 0

Cheers,
Conor.

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