Re: [PATCH v2 1/2] dt-bindings: hwmon: national,lm90: Fix channel constraints for temperature offset

[Conor Dooley <conor@kernel.org>]

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On Thu, Aug 27, 2026 at 06:01:28PM +0100, Conor Dooley wrote:
> On Wed, Aug 26, 2026 at 09:47:48PM +0300, Flaviu Nistor wrote:
> > Limit temperature-offset-millicelsius to remote channels only, since
> > channel 0 is local and this property does not apply to it.
> > Channel 2 is only valid on devices with two remote sensors, so reject
> > channel 2 for compatibles that do not support a second remote channel.
> > 
> > Signed-off-by: Flaviu Nistor <flaviu.nistor@gmail.com>
> > ---
> > Changes in v2:
> > - Use else statement in if/then block as suggested by Conor Dooley. 
> > - Link to v1: https://lore.kernel.org/all/20260824183900.8983-2-flaviu.nistor@gmail.com/
> > 
> >  .../bindings/hwmon/national,lm90.yaml         | 28 +++++++++++++++++--
> >  1 file changed, 25 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/hwmon/national,lm90.yaml b/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
> > index 164068ba069d..a8b2a24501b3 100644
> > --- a/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
> > +++ b/Documentation/devicetree/bindings/hwmon/national,lm90.yaml
> > @@ -113,6 +113,23 @@ allOf:
> >        properties:
> >          ti,extended-range-enable: false
> >  
> > +  - if:
> > +      not:
> > +        properties:
> > +          compatible:
> > +            contains:
> > +              enum:
> > +                - adi,adt7481
> > +                - dallas,max6695
> > +                - dallas,max6696
> > +    then:
> 
> > +      patternProperties:
> > +        "^channel@[0-1]$":
> > +          properties:
> > +            reg:
> > +              enum: [0, 1]
> 
> Is this needed? If channel@2 is false, then you won't be able to get to
> this point to begin with, right?

Hmm, actually keep it. It'd fail dtbs_check but I don't think
dt_binding_check fails for channel@0 + reg = <2>

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

> 
> Conor.
> 
> > +        "channel@2": false
> > +
> >    - if:
> >        properties:
> >          compatible:
> > @@ -134,6 +151,11 @@ allOf:
> >          "^channel@([0-2])$":
> >            properties:
> >              temperature-offset-millicelsius: false
> > +    else:
> > +      patternProperties:
> > +        "channel@0":
> > +          properties:
> > +            temperature-offset-millicelsius: false
> >  
> >    - if:
> >        properties:
> > @@ -149,7 +171,7 @@ allOf:
> >                - onnn,nct1008
> >      then:
> >        patternProperties:
> > -        "^channel@([0-2])$":
> > +        "^channel@([1-2])$":
> >            properties:
> >              temperature-offset-millicelsius:
> >                maximum: 127750
> > @@ -172,7 +194,7 @@ allOf:
> >                - winbond,w83l771
> >      then:
> >        patternProperties:
> > -        "^channel@([0-2])$":
> > +        "^channel@([1-2])$":
> >            properties:
> >              temperature-offset-millicelsius:
> >                maximum: 127875
> > @@ -186,7 +208,7 @@ allOf:
> >                - ti,tmp461
> >      then:
> >        patternProperties:
> > -        "^channel@([0-2])$":
> > +        "^channel@([1-2])$":
> >            properties:
> >              temperature-offset-millicelsius:
> >                maximum: 127937
> > -- 
> > 2.34.1
> > 



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