linux-kernel - What means "sysfs: cannot create duplicate filename '/devices/platform/ff000100.localbus/d0000044.gpio-controller'"

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Date:   Mon, 4 Apr 2022 08:16:48 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Rob Herring <robh+dt@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: What means "sysfs: cannot create duplicate filename
 '/devices/platform/ff000100.localbus/d0000044.gpio-controller'"

Hi,

During boot I'm getting "sysfs: cannot create duplicate filename 
'/devices/platform/ff000100.localbus/d0000044.gpio-controller'"

Below is a grep of "d0000044.gpio-controller" in the log.

Any of what the problem can be and what I have to look for and do to 
avoid it ?

[    2.150954] device: 'd0000044.gpio-controller': device_add
[    2.156358] bus: 'platform': add device d0000044.gpio-controller
[    2.162725] bus: 'platform': __driver_probe_device: matched device 
d0000044.gpio-controller with driver u16-gpio
[    2.172833] platform d0000044.gpio-controller: error -EPROBE_DEFER: 
wait for supplier pic@22
[    2.181019] platform d0000044.gpio-controller: Added to deferred list
[    2.471981] device: 
'platform:d0000000.pic--platform:d0000044.gpio-controller': device_add
[    2.480639] devices_kset: Moving d0000044.gpio-controller to end of list
[    2.487142] platform d0000044.gpio-controller: Linked as a consumer 
to d0000000.pic
[    2.575677] device: 
'platform:d0000044.gpio-controller--platform:ff000100.localbus:led_pwr': 
device_add
[    2.591964] platform ff000100.localbus:led_pwr: Linked as a consumer 
to d0000044.gpio-controller
[    2.648662] device: 
'platform:d0000044.gpio-controller--platform:d0000042.GPIO': device_add
[    2.662877] platform d0000042.GPIO: Linked as a consumer to 
d0000044.gpio-controller
[    2.785941] device: 'd0000044.gpio-controller': device_add
[    2.791614] sysfs: cannot create duplicate filename 
'/devices/platform/ff000100.localbus/d0000044.gpio-controller'
[    2.900228] kobject_add_internal failed for d0000044.gpio-controller 
with -EEXIST, don't try to register things with the same name in the 
same directory.
[    9.797402] platform ff000100.localbus:led_pwr: error -EPROBE_DEFER: 
supplier d0000044.gpio-controller not ready
[   11.229927] devices_kset: Moving d0000044.gpio-controller to end of list
[   11.248799] platform d0000044.gpio-controller: Retrying from deferred 
list
[   11.255806] bus: 'platform': __driver_probe_device: matched device 
d0000044.gpio-controller with driver u16-gpio
[   11.265862] bus: 'platform': really_probe: probing driver u16-gpio 
with device d0000044.gpio-controller
[   11.321422] driver: 'u16-gpio': driver_bound: bound to device 
'd0000044.gpio-controller'
[   11.331732] bus: 'platform': really_probe: bound device 
d0000044.gpio-controller to driver u16-gpio

Thanks
Christophe