linux-kernel - Re: [PATCH v5 16/21] dt-bindings: hwmon: (mr75203) add "moortec, ts-series" property

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Message-ID: <475eb313-53f5-49e6-a6a6-00eb41c5ce57@roeck-us.net>
Date:   Thu, 8 Sep 2022 13:22:21 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Farber, Eliav" <farbere@...zon.com>
Cc:     jdelvare@...e.com, robh+dt@...nel.org, p.zabel@...gutronix.de,
        rtanwar@...linear.com, andriy.shevchenko@...el.com,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, hhhawa@...zon.com, jonnyc@...zon.com
Subject: Re: [PATCH v5 16/21] dt-bindings: hwmon: (mr75203) add "moortec,
 ts-series" property

On 9/8/22 13:18, Farber, Eliav wrote:
> On 9/8/2022 10:02 PM, Guenter Roeck wrote:
>> On Thu, Sep 08, 2022 at 03:24:44PM +0000, Eliav Farber wrote:
>>> Add optional "moortec,ts-series" property to define the temperature
>>> equation and coefficients that shall be used to convert the digital
>>> output to value in milli-Celsius.
>>> Supported series: 5 (default) and 6.
>>>
>>> Series 5:
>>>   T = G + H * (n / cal5 - 0.5) + J * F
>>> Where: G = 60, H = 200, cal5 = 4094, J = -0.1, F = frequency clock in MHz
>>>
>>> Series 6:
>>>    T = G + H * (n / cal5 - 0.5)
>>> Where: G = 57.4, H = 249.4, cal5 = 4096
>>>
>>> Signed-off-by: Eliav Farber <farbere@...zon.com>
>>> ---
>>> V4 -> V3:
>>> - Remove constraints in free-form text descriptions.
>>>
>>> V3 -> V2:
>>> - New patch to introduce "moortec,ts-series" property.
>>>
>>>  .../devicetree/bindings/hwmon/moortec,mr75203.yaml       | 9 +++++++++
>>>  1 file changed, 9 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
>>> index d6b03a6d7043..df849517464e 100644
>>> --- a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
>>> +++ b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
>>> @@ -91,6 +91,15 @@ properties:
>>>        Each channel should not appear more than once.
>>>      $ref: /schemas/types.yaml#/definitions/uint8-array
>>>
>>> +  moortec,ts-series:
>>> +    description:
>>> +      Definition of the temperature equation and coefficients that shall be
>>> +      used to convert the digital output to value in milli-Celsius.
>>> +    minimum: 5
>>> +    maximum: 6
>>> +    default: 5
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>> +
>>
>> I am not a dt expert, but I wonder if this should be handled
>> with different "compatible" properties. Sorry if this was already
>> addressed and I missed it.
> 
> It was already addressed in [PATCH v3 14/19] by Philipp.
> It is indeed confusing which is why I added a detailed description
> to moortec,mr75203.yaml in [PATCH v5 07/21].
> Shortly, the driver is for the controller unit (mr75203), while the
> "series" is a parameter of the temperature unit (mr74137).
> Therefore I added a new TS property and not a different compatible.
> 

Thanks a lot for the clarification.

Guenter