linux-kernel - Re: [PATCH 0/3] hwmon: Introduce and use hwmon_device_register_for

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Date:   Wed, 11 May 2022 12:21:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-hwmon@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 0/3] hwmon: Introduce and use
 hwmon_device_register_for_thermal

On 5/11/22 11:21, Rafael J. Wysocki wrote:
> On Wed, May 11, 2022 at 5:12 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> The thermal subsystem registers a hwmon driver without providing
>> chip information or sysfs group information. This is for legacy reasons
>> and would be difficult to change.
>>
>> At the same time, several attempts have been made to convert hwmon
>> drivers using the deprecated hwmon_device_register() to use
>> hwmon_device_register_with_info() by just providing NULL parameters.
>> This is an abuse of the hwmon API. To prevent this abuse, we want to
>> enforce that a parent device pointer as well as chip information is
>> provided when registering a hwmon device using
>> hwmon_device_register_with_info().
>>
>> To be able to do this, introduce and use a special API for use only by
>> the thermal subsystem (patches 1 and 2). Patch 3 makes the 'dev' and 'chip'
>> parameters of hwmon_device_register_with_info() mandatory.
>>
>> ----------------------------------------------------------------
>> Guenter Roeck (3):
>>        hwmon: Introduce hwmon_device_register_for_thermal
>>        thermal/drivers/thermal_hwmon: Use hwmon_device_register_for_thermal()
>>        hwmon: Make chip parameter for with_info API mandatory
>>
>>   Documentation/hwmon/hwmon-kernel-api.rst |  2 +-
>>   drivers/hwmon/hwmon.c                    | 41 ++++++++++++++++++++++++++++++++---------
>>   drivers/thermal/thermal_hwmon.c          |  6 ++++--
>>   include/linux/hwmon.h                    |  3 +++
>>   4 files changed, 40 insertions(+), 12 deletions(-)
> 
> This looks good to me from the thermal perspective, so please feel
> free to add my ACKs to the first two patches.
> 

Thanks!

Guenter