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

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Date:   Thu, 14 Sep 2023 15:42:01 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Daniel Matyas <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,
        devicetree@...r.kernel.org, linux-kernel@...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 Thu, Sep 14, 2023 at 10:59:45AM +0300, Daniel Matyas wrote:
> These modify the corresponding bits in the configuration register.
> 
> adi,comp-int is a hardware property, because it affects the behavior
> of the interrupt signal and whatever it is connected to.
> 
> adi,timeout-enable is a hardware property, because it affects i2c
> bus operation.
> 
> Signed-off-by: Daniel Matyas <daniel.matyas@...log.com>
> ---
> 
> v2 -> v3: Changed commit subject and message
> 
> v1 -> v2: Added adi,timeout-enable property to binding. Fixed
> dt_binding_check errors.
> 
>  .../bindings/hwmon/adi,max31827.yaml          | 35 +++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> index 2dc8b07b4d3b..6bde71bdb8dd 100644
> --- a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> @@ -32,6 +32,37 @@ properties:
>        Must have values in the interval (1.6V; 3.6V) in order for the device to
>        function correctly.
>  
> +  adi,comp-int:
> +    description:
> +      If present interrupt mode is used. If not present comparator mode is used
> +      (default).
> +    type: boolean
> +
> +  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.

Thanks,
Conor.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1]
> +
> +  adi,flt-q:
> +    description:
> +      Select how many consecutive temperature faults must occur before
> +      overtemperature or undertemperature faults are indicated in the
> +      corresponding status bits.
> +      For max31827 default fault queue is 1. For max31828 and max31829 it is 4.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [1, 2, 4, 8]
> +
> +  adi,timeout-enable:
> +    description:
> +      Enables timeout. Bus timeout resets the I2C-compatible interface when SCL
> +      is low for more than 30ms (nominal).
> +    type: boolean
> +
>  required:
>    - compatible
>    - reg
> @@ -49,6 +80,10 @@ examples:
>              compatible = "adi,max31827";
>              reg = <0x42>;
>              vref-supply = <&reg_vdd>;
> +            adi,comp-int;
> +            adi,alrm-pol = <0>;
> +            adi,flt-q = <1>;
> +            adi,timeout-enable;
>          };
>      };
>  ...
> -- 
> 2.34.1
> 

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