Re: [PATCH v2 06/16] thermal: Don't use 'device' internal thermal zone structure field

Daniel Lezcano
2023-02-23T09:56:48Z

On 22/02/2023 21:06, Rafael J. Wysocki wrote:
> On Wed, Feb 22, 2023 at 9:00 PM Daniel Lezcano
> <daniel.lezcano@linaro.org> wrote:
>>
>> On 22/02/2023 20:43, Rafael J. Wysocki wrote:
>>> On Tue, Feb 21, 2023 at 7:07 PM Daniel Lezcano
>>> <daniel.lezcano@linaro.org> wrote:
>>>>
>>>> Some drivers are directly using the thermal zone's 'device' structure
>>>> field.
>>>>
>>>> Use the driver device pointer instead of the thermal zone device when
>>>> it is available.
>>>>
>>>> Remove the traces when they are duplicate with the traces in the core
>>>> code.
>>>>
>>>> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
>>>> Reviewed-by: Balsam CHIHI <bchihi@baylibre.com> #Mediatek LVTS
>>>> ---
>>
>> [ ... ]
>>
>>>> thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
>>>>
>>>> - dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
>>>> + dev_dbg(data->bgp->dev, "updated thermal zone %s\n",
>>>> data->ti_thermal->type);
>>>
>>> The code before the change is more consistent, because it refers to
>>> the same object in both instances.
>>>
>>> It looks like a type field accessor is needed, eg. thermal_zone_device_type()?
>>>
>>> Or move the debug message to thermal_zone_device_update()?
>>
>> Actually it is done on purpose because the patch 9 replaces the accesses
>> to 'type' by 'id', the thermal_zone_device_type() accessor won't be needed.
>
> Cool.
>
> However, this is a change in behavior (albeit small) which doesn't
> appear to be necessary.
>
> What would be wrong with having a tz->type accessor too?

I can add the 'type' accessor but from my point of view it is not
correct because the information belongs to the thermal framework and it
is used to export the information in the sysfs which is along with the
directory name giving the id of the thermal zone.

Actually, the useful information is the id of the thermal zone, not the
type. This one can be duplicate, for instance:

cat /sys/class/thermal/thermal_zone*/type
acpitz
acpitz

Given there are few places where 'type' is used in the drivers, I prefer
to directly change that to 'id' in the next patch instead of creating
the accessor for 'type', then send another series removing it.

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