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SubjectRe: [PATCH 2/4] thermal/of: Return -ENODEV instead of -EINVAL if registration fails
Am 2022-08-08 20:35, schrieb Guenter Roeck:
> On 8/8/22 11:09, Daniel Lezcano wrote:
>> The previous version of the OF code was returning -ENODEV if no
>> thermal zones description was found or if the lookup of the sensor in
>> the thermal zones was not found.
>>
>> The backend drivers are expecting this return value as an information
>> about skipping the sensor initialization and considered as normal.
>>
>> Fix the return value by replacing -EINVAL by -ENODEV
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
>> ---
>> drivers/thermal/thermal_of.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/thermal/thermal_of.c
>> b/drivers/thermal/thermal_of.c
>> index 368eb58e97cf..4210c18ef7b2 100644
>> --- a/drivers/thermal/thermal_of.c
>> +++ b/drivers/thermal/thermal_of.c
>> @@ -329,7 +329,7 @@ static struct device_node
>> *of_thermal_zone_find(struct device_node *sensor, int
>> np = of_find_node_by_name(NULL, "thermal-zones");
>> if (!np) {
>> pr_err("Unable to find thermal zones description\n");
>
> I really don't like that error message: People will see it (and
> complain)
> whenever a sensor registers and there is no thermal zone, even though
> that
> is perfectly normal (see description above).

I can second that, and there actually two error messages:

[ 6.156983] thermal_sys: Unable to find thermal zones description
[ 6.163125] thermal_sys: Failed to find thermal zone for hwmon id=0

On the sl28 board with the qoriq_thermal driver:
[ 1.917940] thermal_sys: Failed to find thermal zone for tmu id=2
[ 1.929231] thermal_sys: Failed to find thermal zone for tmu id=3
[ 1.940519] thermal_sys: Failed to find thermal zone for tmu id=4
[ 1.951814] thermal_sys: Failed to find thermal zone for tmu id=5
[ 1.963109] thermal_sys: Failed to find thermal zone for tmu id=6
[ 1.974399] thermal_sys: Failed to find thermal zone for tmu id=7
[ 1.985690] thermal_sys: Failed to find thermal zone for tmu id=8
[ 1.996980] thermal_sys: Failed to find thermal zone for tmu id=9
[ 2.008274] thermal_sys: Failed to find thermal zone for tmu id=10
[ 2.019656] thermal_sys: Failed to find thermal zone for tmu id=11
[ 2.031037] thermal_sys: Failed to find thermal zone for tmu id=12
[ 2.048942] thermal_sys: Failed to find thermal zone for tmu id=13
[ 2.060320] thermal_sys: Failed to find thermal zone for tmu id=14
[ 2.071700] thermal_sys: Failed to find thermal zone for tmu id=15

Btw. the driver seems to always register 16 sensors regardless how
many the actual hardware has (or rather: are described in the DT).

-michael

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