linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: max31827: use supply pin name

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Date:   Fri, 22 Sep 2023 16:12:01 -0500
From:   Rob Herring <robh@...nel.org>
To:     Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc:     Daniel Matyas <daniel.matyas@...log.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: max31827: use supply pin name

On Thu, Sep 21, 2023 at 05:20:03PM +0300, Antoniu Miclaus wrote:
> The actual hardware pin name for the supply of max31827 is vdd.
> Update the dt-binding to reflect the hardware properties accordingly.

Changing this breaks the ABI. I see the old one wasn't used by the 
driver, but that's just one driver potentially. You need some 
justification here why it's okay to break the ABI.

> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
>  Documentation/devicetree/bindings/hwmon/adi,max31827.yaml | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> index 2dc8b07b4d3b..21f2d350373b 100644
> --- a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> @@ -27,7 +27,7 @@ properties:
>    reg:
>      maxItems: 1
>  
> -  vref-supply:
> +  vdd-supply:
>      description:
>        Must have values in the interval (1.6V; 3.6V) in order for the device to
>        function correctly.
> @@ -35,7 +35,7 @@ properties:
>  required:
>    - compatible
>    - reg
> -  - vref-supply
> +  - vdd-supply
>  
>  additionalProperties: false
>  
> @@ -48,7 +48,7 @@ examples:
>          temperature-sensor@42 {
>              compatible = "adi,max31827";
>              reg = <0x42>;
> -            vref-supply = <&reg_vdd>;
> +            vdd-supply = <&reg_vdd>;
>          };
>      };
>  ...
> -- 
> 2.42.0
>