linux-kernel - Re: [PATCH v1 08/18] thermal: intel: pch_thermal: Migrate to thermal_zone_device

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Date: Fri, 2 Feb 2024 11:10:51 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: daniel.lezcano@...aro.org, miquel.raynal@...tlin.com,
 rui.zhang@...el.com, lukasz.luba@....com, support.opensource@...semi.com,
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Subject: Re: [PATCH v1 08/18] thermal: intel: pch_thermal: Migrate to
 thermal_zone_device_register()

Il 01/02/24 20:51, Rafael J. Wysocki ha scritto:
> On Tue, Jan 30, 2024 at 12:13 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> The thermal API has a new thermal_zone_device_register() function which
>> is deprecating the older thermal_zone_device_register_with_trips() and
>> thermal_tripless_zone_device_register().
>>
>> Migrate to the new thermal zone device registration function.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>>   drivers/thermal/intel/intel_pch_thermal.c | 12 ++++++++----
>>   1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
>> index b3905e34c507..73d7c2ac7dbc 100644
>> --- a/drivers/thermal/intel/intel_pch_thermal.c
>> +++ b/drivers/thermal/intel/intel_pch_thermal.c
>> @@ -160,6 +160,7 @@ static int intel_pch_thermal_probe(struct pci_dev *pdev,
>>                                     const struct pci_device_id *id)
>>   {
>>          enum pch_board_ids board_id = id->driver_data;
>> +       struct thermal_zone_device_params tzdp;
>>          struct pch_thermal_device *ptd;
>>          int nr_trips = 0;
>>          u16 trip_temp;
>> @@ -233,10 +234,13 @@ static int intel_pch_thermal_probe(struct pci_dev *pdev,
>>
>>          nr_trips += pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
>>
>> -       ptd->tzd = thermal_zone_device_register_with_trips(board_names[board_id],
>> -                                                          ptd->trips, nr_trips,
>> -                                                          0, ptd, &tzd_ops,
>> -                                                          NULL, 0, 0);
>> +       tzdp.tzp.type = board_names[board_id];
>> +       tzdp.tzp.devdata = ptd;
>> +       tzdp.tzp.trips = ptd->trips;
>> +       tzdp.tzp.num_trips = nr_trips;
>> +       tzdp.tzp.ops = &tzd_ops;
>> +
>> +       ptd->tzd = thermal_zone_device_register(&tzdp);
> 
> IMV, this should be
> 
> ptd->tzd = thermal_zone_device_register(board_names[board_id],
> ptd->trips, nr_trips, &tzd_ops, ptd, NULL);
> 
> and the tzdp variable is not necessary even.
> 

The whole point of thermal_zone_device_register() taking just one parameter was
that those older functions were taking a bit too many params, and with the
introduction of Thermal Zone name we'd be adding even more.

For intel_pch_thermal, things are more or less the same, assignments are done there
line by line... but for most of the others, IMO it's easier and schematized as a
single stack-initialized structure that could even be constified in the future.

> Analogously in the rest of the series (ie. patches [4-18/18]).
> 
>>          if (IS_ERR(ptd->tzd)) {
>>                  dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
>>                          board_names[board_id]);
>> --