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 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?

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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