linux-kernel - Re: [PATCH v2 1/2] dt-bindings: hwmon: Add max6639

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Message-ID: <be129c4f-3ad7-c54b-936e-08b142608ebc@linaro.org>
Date:   Mon, 24 Apr 2023 11:42:57 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Naresh Solanki <naresh.solanki@...ements.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Marcello Sylvester Bauer <sylv@...v.io>,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: hwmon: Add max6639

On 24/04/2023 11:18, Naresh Solanki wrote:

>>> Changes in V2:
>>> - Update subject
>>> - Drop blank lines
>>> ---
>>>   .../bindings/hwmon/maxim,max6639.yaml         | 52 +++++++++++++++++++
>>>   1 file changed, 52 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
>>> new file mode 100644
>>> index 000000000000..1aaedfd7cee0
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/hwmon/maxim,max6639.yaml
>>> @@ -0,0 +1,52 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/hwmon/maxim,max6639.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Maxim max6639
>>
>> What is this device? fan controller?
> Yes Fan controller.
> Do you want me to update the title here as:
> "Maxim MAC6639 2 channel fan controller & temperature monitor" ?

Enough would be:
Maxim MAX6639 Fan Controller


> 
>>
>>> +
>>> +maintainers:
>>> +  - Naresh Solanki <Naresh.Solanki@...ements.com>
>>> +
>>> +description: |
>>> +  The MAX6639 is a 2-channel temperature monitor with dual, automatic, PWM
>>> +  fan-speed controller.  It monitors its own temperature and one external
>>> +  diode-connected transistor or the temperatures of two external diode-connected
>>> +  transistors, typically available in CPUs, FPGAs, or GPUs.
>>> +
>>> +  Datasheets:
>>> +    https://datasheets.maximintegrated.com/en/ds/MAX6639-MAX6639F.pdf
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - maxim,max6639
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  '#address-cells':
>>> +    const: 1
>>> +
>>> +  '#size-cells':
>>> +    const: 0
>>
>> Why do you need these two properties?
> Ack. Will remove them.
>>
>> Anyway, the binding looks incomplete. Where are the supplies? Interrupts?
> This patch just adds basic support to the existing platform driver.
> Intention is to be able to call the driver from DT with basic 
> initialization from driver the existing driver.

Bindings should be rather complete. Here the datasheet is accessible and
few properties quite obvious, so I don't see a reason to skip them.


Best regards,
Krzysztof