Re: [PATCH] platform: arm64: qcom-hamoa-ec: Register cooling devices with their name

[Anvesh Jain P <anvesh.p@oss.qualcomm.com>]

On 6/29/2026 6:03 PM, Ilpo Järvinen wrote:
> On Mon, 29 Jun 2026, Anvesh Jain P wrote:
> 
>> Each fan is registered as a thermal cooling device using
>> devm_thermal_of_cooling_device_register(). When the thermal core gained
>> cooling device ID support, the helper's prototype changed: its second
>> argument became a 'u32 cdev_id' and its third a 'const char *type',
>> replacing the previous 'struct device_node *np'.
>>
>> The resulting semantic conflict between the EC driver and the reworked
>> thermal helper was resolved while merging the drivers-x86 tree into
>> linux-next by passing NULL as the 'type' argument, dropping the per-fan
>> 'name' string. As a result every fan is registered as a cooling device
>> with an empty name.
>>
>> Pass 'name' as the 'type' argument so the cooling devices are registered
>> with their intended "qcom_ec_fan_<n>" names.
>>
>> Fixes: 5c44f48e91de ("platform: arm64: Add driver for EC found on Qualcomm reference devices")
>> Signed-off-by: Anvesh Jain P <anvesh.p@oss.qualcomm.com>
>> ---
>>  drivers/platform/arm64/qcom-hamoa-ec.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/arm64/qcom-hamoa-ec.c b/drivers/platform/arm64/qcom-hamoa-ec.c
>> index 45829f2786b7..12196d56b60e 100644
>> --- a/drivers/platform/arm64/qcom-hamoa-ec.c
>> +++ b/drivers/platform/arm64/qcom-hamoa-ec.c
>> @@ -391,7 +391,7 @@ static int qcom_ec_probe(struct i2c_client *client)
>>  		ec_cdev->fan_id = i + 1;
>>  		ec_cdev->parent_dev = dev;
>>  
>> -		ec_cdev->cdev = devm_thermal_of_cooling_device_register(dev, 0, NULL, ec_cdev,
>> +		ec_cdev->cdev = devm_thermal_of_cooling_device_register(dev, 0, name, ec_cdev,
>>  									&qcom_ec_thermal_ops);
>>  		if (IS_ERR(ec_cdev->cdev)) {
>>  			return dev_err_probe(dev, PTR_ERR(ec_cdev->cdev),
>>
>> ---
>> base-commit: 948efecf22e49aa4bf55bb73ec79a0ddcfd38571
> 
> $ git log 948efecf22e49aa4bf55bb73ec79a0ddcfd38571
> fatal: bad object 948efecf22e49aa4bf55bb73ec79a0ddcfd38571
> 
> Please don't base your submissions on some random commits. There has never 
> been code with (dev, 0, NULL, ...) in platforms drivers tree (and neither 
> in Linus' tree).
> 

You're right. I based this on a linux-next snapshot; the (dev, 0, NULL,
...) form only existed transiently as a merge-conflict fixup there and
never in the platform-drivers or Linus' tree. Current linux-next already
registers the fans with 'name' via
devm_thermal_of_child_cooling_device_register(), so the issue is gone.

I'll drop this patch.

-- 
Best Regards,
Anvesh