linux-kernel - Re: [PATCH 1/2] dt-bindings: hwmon: Describe changes to the device tree

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Message-ID: <55b4b084-5b92-9e0d-9fa8-28a4062fb249@roeck-us.net>
Date:   Mon, 11 Sep 2023 06:38:27 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Daniel Matyas <daniel.matyas@...log.com>
Cc:     Jean Delvare <jdelvare@...e.com>, Rob Herring <robh+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: hwmon: Describe changes to the device
 tree

On 9/11/23 01:37, Daniel Matyas wrote:
> Added new attributes to the device tree:
> 	- adi,comp-int
> 	- adi,alrm-pol
> 	- adi,flt-q
> 
> These modify the corresponding bits in the configuration register.
> 
> Signed-off-by: Daniel Matyas <daniel.matyas@...log.com>
> ---
>   .../bindings/hwmon/adi,max31827.yaml          | 21 +++++++++++++++++++
>   1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> index 2dc8b07b4d3b..b10878c4a05d 100644
> --- a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> @@ -32,10 +32,28 @@ properties:
>         Must have values in the interval (1.6V; 3.6V) in order for the device to
>         function correctly.
>   
> +  adi,comp-int:
> +    description:
> +      A boolean property. If present interrupt mode is used. If not present
> +      comparator mode is used (default).
> +
> +  adi,alrm-pol:
> +    description:
> +      A boolean propert. If present, alarm is active on high. If not present,

property

> +      alarm is active on low.

Is this the chip default ? That might be worth mentioning.

> +
> +  adi,flt-q:
> +    description:
> +      Select how many consecutive temperature faults must occur before
> +      overtemperature or undertemperature faults are indicated in the
> +      corresponding status bits.
> +            - can be 1, 2, 4 or 8
> +
>   required:
>     - compatible
>     - reg
>     - vref-supply
> +  - adi,flt-q

I do not see a need to make this mandatory. Default can and should be the chip
default.

>   
>   additionalProperties: false
>   
> @@ -49,6 +67,9 @@ examples:
>               compatible = "adi,max31827";
>               reg = <0x42>;
>               vref-supply = <&reg_vdd>;
> +            adi,comp-int;
> +            adi,alrm-pol;
> +            adi,flt-q = <1>;
>           };
>       };
>   ...