Re: [PATCH] iio: adc: qcom-spmi-adc5-gen3: Allocate unique ADC_TM aux device IDs

[Shawn Guo <shengchao.guo@oss.qualcomm.com>]

On Thu, Oct 08, 2026 at 11:11:54AM +0800, Shawn Guo wrote:
> adc5_gen3_add_aux_tm_device() never sets the auxiliary device id, so
> every ADC5 Gen3 instance with at least one qcom,adc-tm channel tries
> to register the same device name. With ADC_TM channels on more than
> one PMIC, the second instance to probe fails:
> 
>   sysfs: cannot create duplicate filename '/bus/auxiliary/devices/qcom_spmi_adc5_gen3.adc5_tm_gen3.0'
>   ...
>   auxiliary qcom_spmi_adc5_gen3.adc5_tm_gen3.0: adding auxiliary device failed!: -17
>   qcom-spmi-adc5-gen3 c400000.spmi:pmic@8:adc@7200: error -EEXIST: Failed to add auxiliary TM device
> 
> The ADC probe then fails as a whole, so that PMIC loses both its IIO
> channels and its thermal zones. This shows up on Nord, which has
> thermistor channels on two PMAU0102 PMICs.
> 
> Allocate the id from a driver-wide IDA and release it from the
> auxiliary device release callback. The ADC_TM driver matches on the
> device name only, so the instance number does not affect binding.
> 

Fixes: baff45179e90 ("iio: adc: Add support for QCOM PMIC5 Gen3 ADC")

> Assisted-by: LLM
> Signed-off-by: Shawn Guo <shengchao.guo@oss.qualcomm.com>