linux-kernel - Re: [PATCH v3 1/1] dt-bindings: hwmon: Add maxim max31790

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Message-ID: <8e7f8ca4-4596-464a-a307-0f726863f776@amperemail.onmicrosoft.com>
Date: Wed, 14 Aug 2024 15:58:02 +0700
From: Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Conor Dooley <conor@...nel.org>, Guenter Roeck <linux@...ck-us.net>
Cc: Chanh Nguyen <chanh@...amperecomputing.com>,
 Jean Delvare <jdelvare@...e.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Justin Ledford
 <justinledford@...gle.com>, devicetree@...r.kernel.org,
 linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
 OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
 Open Source Submission <patches@...erecomputing.com>,
 Phong Vo <phong@...amperecomputing.com>,
 Thang Nguyen <thang@...amperecomputing.com>,
 Quan Nguyen <quan@...amperecomputing.com>
Subject: Re: [PATCH v3 1/1] dt-bindings: hwmon: Add maxim max31790



On 13/08/2024 23:21, Krzysztof Kozlowski wrote:
> On 13/08/2024 18:16, Conor Dooley wrote:
>>>>> +examples:
>>>>> +  - |
>>>>> +    i2c {
>>>>> +      #address-cells = <1>;
>>>>> +      #size-cells = <0>;
>>>>> +
>>>>> +      fan-controller@21 {
>>>>> +        compatible = "maxim,max31790";
>>>>> +        reg = <0x21>;
>>>>> +        clocks = <&sys_clk>;
>>>>> +        resets = <&reset 0>;
>>>>> +      };
>>>>> +    };
>>>>
>>>> What does this example demonstrate? The one below seems useful, this one
>>>> I don't quite understand - what's the point of a fan controller with no
>>>> fans connected to it? What am I missing?
>>>>
>>>
>>> Just guessing, but maybe this is supposed to reflect a system which only monitors fan
>>> speeds but does not implement fan control.
>>
>> Even without any control, I would expect to see fan-# child nodes, just
>> no pwms property in them. Without the child nodes, how does software
>> determine which fan is being monitored by which channel?
> 
> Yeah, to me this example is confusing. If device's purpose is to also
> monitor, then hardware description in "description:" field should be a
> bit extended.
> 
> Best regards,
> Krzysztof
> 

Thank all for your comments!

I'll keep only complete example. I'm going to push patch v4 in the 
coming days.

Regards!
Chanh