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

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Message-ID: <1c027a2a-1572-2968-4fbe-3be6c2f966a9@amazon.com>
Date:   Sat, 3 Sep 2022 22:16:06 +0300
From:   "Farber, Eliav" <farbere@...zon.com>
To:     Rob Herring <robh@...nel.org>
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>, <andriy.shevchenko@...el.com>,
        "Farber, Eliav" <farbere@...zon.com>
Subject: Re: [PATCH v3 16/19] dt-bindings: hwmon: (mr75203) add coefficient
 properties for the thermal equation

On 9/2/2022 11:03 PM, Rob Herring wrote:
> 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'
>
Fixed in v4.

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

g and h can't be 0, and since they must be multiple of 1000 I added:
minimum: 1000
j is negative or 0, so I added:
maximum: 0

>
>> +      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 
Fixed in v4.