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Date: Mon, 18 Mar 2024 11:00:39 +0100
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Subject: Re: [PATCH 1/3] dt-bindings: hwmon: Add maxim max31790 driver
 bindings
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To: Chanh Nguyen <chanh@amperemail.onmicrosoft.com>,
 Chanh Nguyen <chanh@os.amperecomputing.com>, Jean Delvare
 <jdelvare@suse.com>, Guenter Roeck <linux@roeck-us.net>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Justin Ledford
 <justinledford@google.com>, devicetree@vger.kernel.org,
 linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
 OpenBMC Maillist <openbmc@lists.ozlabs.org>,
 Open Source Submission <patches@amperecomputing.com>
Cc: Phong Vo <phong@os.amperecomputing.com>,
 Thang Nguyen <thang@os.amperecomputing.com>,
 Quan Nguyen <quan@os.amperecomputing.com>
References: <20240311111347.23067-1-chanh@os.amperecomputing.com>
 <20240311111347.23067-2-chanh@os.amperecomputing.com>
 <6fb70adb-aa85-4b9c-b093-afa4ec7ed056@linaro.org>
 <ab8b45c5-2ef0-4a87-87bf-f797954b4574@amperemail.onmicrosoft.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <ab8b45c5-2ef0-4a87-87bf-f797954b4574@amperemail.onmicrosoft.com>
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On 18/03/2024 10:51, Chanh Nguyen wrote:
> 
>> It does not look like you tested the bindings, at least after quick
>> look. Please run `make dt_binding_check` (see
>> Documentation/devicetree/bindings/writing-schema.rst for instructions).
>> Maybe you need to update your dtschema and yamllint.
>>
> 
> 
> I tested the binding, I didn't see any warning/error log. Please review 
> my logs as below

Hm, I don't remember what brought my attention to possible error. Maybe
I mistyped my template.

> 
> => make dt_binding_check DT_SCHEMA_FILES=/hwmon/max31790.yaml
> make[1]: Entering directory '/DISK4T/work/community/linux/out'
>    DTEX    Documentation/devicetree/bindings/hwmon/max31790.example.dts
>    DTC_CHK Documentation/devicetree/bindings/hwmon/max31790.example.dtb
> make[1]: Leaving directory '/DISK4T/work/community/linux/out'
> 
>>>
>>> Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
>>> ---
>>>   .../devicetree/bindings/hwmon/max31790.yaml   | 44 +++++++++++++++++++
>>>   1 file changed, 44 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/hwmon/max31790.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/hwmon/max31790.yaml b/Documentation/devicetree/bindings/hwmon/max31790.yaml
>>> new file mode 100644
>>> index 000000000000..5a93e6bdebda
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/hwmon/max31790.yaml
>>
>> Filename like compatible.
> 
> Yes, I'll update that in v2
> 
>>
>>> @@ -0,0 +1,44 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/hwmon/max31790.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: The Maxim MAX31790 Fan Controller
>>> +
>>> +maintainers:
>>> +  - Jean Delvare <jdelvare@suse.com>
>>> +  - Guenter Roeck <linux@roeck-us.net>
>>
>> You should have here someone responsible for hardware, not subsystem
>> maintainers.
>>
> 
> Hi Krzysztof,
> I checked the history of the drivers/hwmon/max31790.c and see Guenter 
> Roeck <linux@roeck-us.net> as an important maintainer. I saw many 
> commits from him. So, I add him to maintainer list.

OK

> 
>>> +
>>> +description: >
>>> +  The MAX31790 controls the speeds of up to six fans using six
>>> +  independent PWM outputs. The desired fan speeds (or PWM duty cycles)
>>> +  are written through the I2C interface.
>>> +
>>> +  Datasheets:
>>> +    https://datasheets.maximintegrated.com/en/ds/MAX31790.pdf
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: maxim,max31790
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>
>> That's weirdly empty.
>>
> 
> Hi Krzysztof,
> I have not yet understood your comment here. Please help give more 
> details for my missing! Thank Krzysztof!

I expect many more properties of a fan controller. Resources (clocks,
PWMs, supplies) and FAN specific properties.


>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +
>>
>> You miss allOf: with $ref to fan controller schema.
>>
> 
> Thank Krzysztof,
> I'll add the allOf at v2.
> 
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    i2c {
>>> +      #address-cells = <1>;
>>> +      #size-cells = <0>;
>>> +
>>> +      max31790@20 {
>>
>> Node names should be generic. See also an explanation and list of
>> examples (not exhaustive) in DT specification:
>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>>
> 
> I suggest some node names, such as "i2c-fan" or "fan-controller" . Can 
> you please share your ideas with me!

Look at recent commits and patches for similar type of a device.

Best regards,
Krzysztof