linux-kernel - Re: [PATCH 1/3] dt-bindings: hwmon: Add maxim max31790 driver bindings

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Message-ID: <ab8b45c5-2ef0-4a87-87bf-f797954b4574@amperemail.onmicrosoft.com>
Date: Mon, 18 Mar 2024 16:51:46 +0700
From: Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Chanh Nguyen <chanh@...amperecomputing.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>,
 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>
Cc: Phong Vo <phong@...amperecomputing.com>,
 Thang Nguyen <thang@...amperecomputing.com>,
 Quan Nguyen <quan@...amperecomputing.com>
Subject: Re: [PATCH 1/3] dt-bindings: hwmon: Add maxim max31790 driver
 bindings



On 11/03/2024 23:55, Krzysztof Kozlowski wrote:
> On 11/03/2024 12:13, Chanh Nguyen wrote:
>> Add a device tree bindings for max31790 device.
> 
> Subject: drop "driver", bindings are about hardware.
> 

Yes, I'll drop "driver" at v2 updating.

> 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

=> 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@...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@...e.com>
>> +  - Guenter Roeck <linux@...ck-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@...ck-us.net> as an important maintainer. I saw many 
commits from him. So, I add him to maintainer list.

>> +
>> +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!
>> +
>> +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!

> 
> Best regards,
> Krzysztof
>