linux-kernel - Re: [PATCH v2 2/7] thermal/core: Encapsulate tz->device field

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Message-ID: <c2581726-3e02-104c-f2ac-55268470d2c8@linaro.org>
Date:   Tue, 11 Apr 2023 22:20:07 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     rui.zhang@...el.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH v2 2/7] thermal/core: Encapsulate tz->device field

On 11/04/2023 20:19, Rafael J. Wysocki wrote:
> On Mon, Apr 10, 2023 at 10:53 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
>>
>> There are still some drivers needing to play with the thermal zone
>> device internals. That is not the best but until we can figure out if
>> the information is really needed, let's encapsulate the field used in
>> the thermal zone device structure, so we can move forward relocating
>> the thermal zone device structure definition in the thermal framework
>> private headers.
> 
> I'm not really sure why this is needed, so please explain.

Some drivers are accessing tz->device, that implies they have the 
knowledge of the thermal_zone_device structure but we want to 
self-encapsulate this structure and reduce the scope of the structure to 
the thermal core only.

The ACPI and the Menlon drivers are the drivers accessing tz->device.

By adding this wrapper, these drivers do no longer need the thermal zone 
device structure definition.

>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>   drivers/thermal/thermal_core.c | 6 ++++++
>>   include/linux/thermal.h        | 1 +
>>   2 files changed, 7 insertions(+)
>>
>> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
>> index c5025aca22ee..842f678c1c3e 100644
>> --- a/drivers/thermal/thermal_core.c
>> +++ b/drivers/thermal/thermal_core.c
>> @@ -1398,6 +1398,12 @@ int thermal_zone_device_id(struct thermal_zone_device *tzd)
>>   }
>>   EXPORT_SYMBOL_GPL(thermal_zone_device_id);
>>
>> +struct device *thermal_zone_device(struct thermal_zone_device *tzd)
>> +{
>> +       return &tzd->device;
>> +}
>> +EXPORT_SYMBOL_GPL(thermal_zone_device);
>> +
>>   /**
>>    * thermal_zone_device_unregister - removes the registered thermal zone device
>>    * @tz: the thermal zone device to remove
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index 82ddb32f9876..87837094d549 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -313,6 +313,7 @@ thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int
>>   void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
>>   const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
>>   int thermal_zone_device_id(struct thermal_zone_device *tzd);
>> +struct device *thermal_zone_device(struct thermal_zone_device *tzd);
>>
>>   int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
>>                                       struct thermal_cooling_device *,
>> --
>> 2.34.1
>>

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