linux-kernel - Re: [PATCH 1/3] platform/x86/pcengines-apuv2: add mpcie reset gpio export

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Date:   Mon, 15 Jul 2019 16:38:51 +0200
From:   Florian Eckert <fe@....tdt.de>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     Eckert.Florian@...glemail.com, info@...ux.net,
        dvhart@...radead.org, andy@...radead.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] platform/x86/pcengines-apuv2: add mpcie reset gpio
 export


>> On APUx we have also mpcie2/mpcie3 reset pins. To make it possible to 
>> reset
>> the ports from the userspace, add the definition to this platform
>> device. The gpio can then be exported by the legancy gpio subsystem to
>> toggle the mpcie reset pin.
>> 
> 
> Just tested your patch on an apu3. The driver itself seems to work,
> but the pins don't seem to actually do anything.
> 
> How exactly did you test it ? Do you have some test case ?

I plugged in a mpcie  usb modem.
In my test case it was a EC25 from Quectel in mpcie2 port.
After that I did a reboot and exported the gpio via "/sys/class/gpio"
Then I executed the command "echo 0 > /sys/class/gpio/<name>/value" and 
"echo 1 > /sys/class/gpio/<name>/value".
Then I have seen the log message in the kernel that the device did an 
unregistration/registration
.
-- Florian