linux-kernel - Re: [PATCH v2 2/4] dt-bindings: hwmon/pmbus: Add mps,mpq7932 power-management IC

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Date:   Thu, 1 Dec 2022 17:38:54 +0100
From:   Saravanan Sekar <saravanan@...umiz.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, marten.lindahl@...s.com,
        jdelvare@...e.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Subject: Re: [PATCH v2 2/4] dt-bindings: hwmon/pmbus: Add mps,mpq7932
 power-management IC

On 01/12/22 17:15, Krzysztof Kozlowski wrote:
> On 01/12/2022 16:37, Guenter Roeck wrote:
>> On 12/1/22 03:38, Krzysztof Kozlowski wrote:
>>> On 01/12/2022 12:29, Saravanan Sekar wrote:
>>>> On 01/12/22 11:26, Krzysztof Kozlowski wrote:
>>>>> On 01/12/2022 05:46, Saravanan Sekar wrote:
>>>>>> Document mpq7932 power-management IC
>>>>>>
>>>>>> Signed-off-by: Saravanan Sekar <saravanan@...umiz.com>
>>>>>> ---
>>>>>
>>>>> This is a friendly reminder during the review process.
>>>>>
>>>>> It seems my previous comments were not fully addressed. Maybe my
>>>>> feedback got lost between the quotes, maybe you just forgot to apply it.
>>>>> Please go back to the previous discussion and either implement all
>>>>> requested changes or keep discussing them.
>>>>>
>>>> Hi Krzysztof,
>>>>
>>>> Thanks for your time to review and feedback.
>>>>
>>>> Here are the summary of comments on V1, I have fixed all according to my
>>>> understanding.
>>>>
>>>>
>>>> 1. Use subject prefixes matching the subsystem (git log --oneline -- ...).
>>>>
>>>> git log --oneline -- Documentation/devicetree/bindings/hwmon/pmbus/
>>>> 1ccca53618c4 dt-bindings: hwmon/pmbus: Add mps,mpq7932 power-management IC
>>>> 373c0a77934c dt-bindings: hwmon/pmbus: Add ti,lm25066 power-management IC
>>>> 7f464532b05d dt-bindings: Add missing 'additionalProperties: false'
>>>> 8a36e38d8b0f dt-bindings: hwmon/pmbus: Add ti,ucd90320 power sequencer
>>>>
>>>> I have used the same format of 373c0a77934c.
>>>>
>>>> 2. Does not look like you tested the bindings. Please run `make
>>>> dt_binding_check` (see
>>>> Documentation/devicetree/bindings/writing-schema.rst for instructions).
>>>>
>>>> I did run dt_binding_check on V1 but failed to notice warnings. Fixed
>>>> warning on V2 and didn't observed any warnings.
>>>>
>>>> 3. Why requiring nodename? Device schemas usually don't do that.
>>>> dropped "pattern: "pmic@[0-9a-f]{1,2}""
>>>>
>>>> 4. regulators node is a regulator with one more regulator? Drop.
>>>> dropped "$ref: regulator.yaml# "
>>>
>>> The comment was - drop entire regulators node.
>>>
>>> Plus additional comment for the driver (and related to bindings) was
>>> that this is not hwmon but a regulator driver. Why putting regulator
>>> driver in hwmon?
>>>
>>
>> Turns out this is primarily a hardware monitoring driver, like the drivers
>> for all other PMBus chips. Regulator support is actually optional; the driver
>> works perfectly well with CONFIG_REGULATOR=n (except that it needs some
>> #ifdefs to address that situation).
> 
> OK, this would explain location  of the driver. However the bindings are
> saying:
> "Monolithic Power System MPQ7932 PMIC"
> and PMIC is not mainly a hwmon device, even if it has such capabilities.
> It might be missing description and proper title... or might be misplaced.
> 

Indeed it is PMIC chip. I think this is not the first and not sure title 
has to be changed for hwmon subsystem.

bindings/hwmon/pmbus/ti,lm25066.yaml
title: National Semiconductor/Texas Instruments LM250x6/LM506x 
power-management ICs

Thanks,
Saravanan