linux-kernel - Re: [PATCH v3 16/19] dt-bindings: hwmon: (mr75203) add coefficient properties for the thermal equation

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Message-ID: <20220902200353.GA318894-robh@kernel.org>
Date:   Fri, 2 Sep 2022 15:03:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     Eliav Farber <farbere@...zon.com>
Cc:     jdelvare@...e.com, linux@...ck-us.net, p.zabel@...gutronix.de,
        rtanwar@...linear.com, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        talel@...zon.com, hhhawa@...zon.com, jonnyc@...zon.com,
        hanochu@...zon.com, ronenk@...zon.com, itamark@...zon.com,
        shellykz@...zon.com, shorer@...zon.com, amitlavi@...zon.com,
        almogbs@...zon.com, dkl@...zon.com, rahul.tanwar@...ux.intel.com,
        andriy.shevchenko@...el.com
Subject: Re: [PATCH v3 16/19] dt-bindings: hwmon: (mr75203) add coefficient
 properties for the thermal equation

On Tue, Aug 30, 2022 at 07:22:09PM +0000, Eliav Farber wrote:
> Add optional temperature coefficient properties:
>  *) moortec,ts-coeff-g
>  *) moortec,ts-coeff-h
>  *) moortec,ts-coeff-cal5
>  *) moortec,ts-coeff-j
> If defined they shall be used instead of defaults.
> 
> The coefficients were added to device tree on top of the series property
> (which can be used to select between series 5 and series 6), because
> coefficients can vary between product and product, and code defaults might
> not be accurate enough.
> 
> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
> V3 -> V2:
> - Add "moortec" prefix to property name.
> 
>  .../bindings/hwmon/moortec,mr75203.yaml       | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> index ec2dbe7da9c2..a92da6064285 100644
> --- a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
> @@ -74,6 +74,37 @@ properties:
>      default: 5
>      $ref: /schemas/types.yaml#definitions/uint32
>  
> +  moortec,ts-coeff-g:
> +    description:
> +      G coefficient for temperature equation.
> +      Value should be multiplied by factor 1000.

If you just multiply the values here, you can specify 'multipleOf: 1000'

Either way, some constraints would be nice. Or is 0 - 2^32 valid?


> +      Default for series 5 = 60000
> +      Default for series 6 = 57400
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  moortec,ts-coeff-h:
> +    description:
> +      H coefficient for temperature equation.
> +      Value should be multiplied by factor 1000.
> +      Default for series 5 = 200000
> +      Default for series 6 = 249400
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  moortec,ts-coeff-cal5:
> +    description:
> +      cal5 coefficient for temperature equation (can't be 0).

minimum: 1

> +      Default for series 5 = 4094
> +      Default for series 6 = 4096
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +  moortec,ts-coeff-j:
> +    description:
> +      J coefficient for temperature equation.
> +      Value should be multiplied by factor 1000.
> +      Default for series 5 = -100
> +      Default for series 6 = 0
> +    $ref: /schemas/types.yaml#/definitions/int32
> +
>  required:
>    - compatible
>    - reg
> @@ -97,5 +128,7 @@ examples:
>          resets = <&rcu0 0x40 7>;
>          moortec,vm-active-channels = <0x10 0x05>;
>          moortec,vm-pre-scaler = <5 6>;
> +        moortec,ts-coeff-g = <61400>;
> +        moortec,ts-coeff-h = <253700>;
>          #thermal-sensor-cells = <1>;
>      };
> -- 
> 2.37.1
> 
>