linux-kernel - Re: regmap: Failed to create debugfs directory

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Date:   Thu, 1 Mar 2018 15:28:37 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     brgl@...ev.pl, david@...hnology.com,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: regmap: Failed to create debugfs directory

On Thu, Mar 1, 2018 at 3:19 PM, Fabio Estevam <festevam@...il.com> wrote:
> Hi,
>
> Running linux-next 20180301 on a imx6q-sabresd the following
> regmap-debugfs warnings are seen:
>
> [    0.067965] CPU identified as i.MX6Q, silicon rev 1.2
> [    0.083466] vdd1p1: supplied by regulator-dummy
> [    0.084768] vdd3p0: supplied by regulator-dummy
> [    0.085816] vdd2p5: supplied by regulator-dummy
> [    0.109831] (NULL device *): Failed to create debugfs directory
> ....
>
> [    2.961117] input: EETI eGalax Touch Screen as
> /devices/soc0/soc/2100000.aips-bus/21a8000.i2c/i2c-2/2-0004/input/input0
> [    2.977027] (NULL device *): Failed to create debugfs directory
> [    2.983929] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered
> 20cc000.snvs:snvs-rtc-lp as rtc0
> [    2.993457] i2c /dev entries driver
> [    3.002084] (NULL device *): Failed to create debugfs directory
> [    3.010452] imx2-wdt 20c0000.wdog: timeout 60 sec (nowayout=0)

This only happens when the regmap name is 'dummy'.

[    0.083651] vdd1p1: supplied by regulator-dummy
[    0.084929] vdd3p0: supplied by regulator-dummy
[    0.085974] vdd2p5: supplied by regulator-dummy
[    0.110028] *****regmap name: dummy
[    0.110090] (NULL device *): regmap*** Failed to create debugfs directory


[    3.001355] input: EETI eGalax Touch Screen as
/devices/soc0/soc/2100000.aips-bus/21a8000.i2c/i2c-2/2-0004/input/input0
[    3.016820] *****regmap name: dummy
[    3.020450] (NULL device *): regmap*** Failed to create debugfs directory
[    3.028316] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered
20cc000.snvs:snvs-rtc-lp as rtc0
[    3.037854] i2c /dev entries driver
[    3.046467] *****regmap name: dummy
[    3.050078] (NULL device *): regmap*** Failed to create debugfs directory

How should we treat the dummy regmap entries?

Thanks