Bug#810894: src:linux: GPIO probe failure on Linkstation LS-WXL/WSXL

[Roger Shimizu <rogershimizu@gmail.com>]

On Thu, Jan 14, 2016 at 11:32 PM, Roger Shimizu <rogershimizu@gmail.com> wrote:
> Dear Uwe,
>
> On Thu, Jan 14, 2016 at 11:08 PM, Uwe Kleine-König
> <uwe+debian@kleine-koenig.org> wrote:
>>>>> I need to run the following command to enable USB port on Linkstation
>>>>> LS-WXL/WSXL (armel/kirkwood with DTS [0] ):
>>>>>   echo 37 >/sys/class/gpio/export
>>>>>   echo out > /sys/class/gpio/gpio37/direction
>>>>>   echo 1 > /sys/class/gpio/gpio37/value
>>
>> Can you post the contents of /sys/kernel/debug/gpio when the broken
>> kernel is running?
>
> Thanks for the debugging tool!
> It seems there's clue ...
>
> Here's the log for working & non-working kernel:
>
> # uname -a
> Linux LS-WXL 4.2.0-0.bpo.1-kirkwood #1 Debian 4.2.6-3~bpo8+2
> (2015-12-14) armv5tel GNU/Linux
> # mount -t debugfs none /sys/kernel/debug
> # cat  /sys/kernel/debug/gpio
> GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio:
>  gpio-28  (HDD0 Power          ) out hi
>  gpio-29  (HDD1 Power          ) out hi
>
> GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio:
>  gpio-34  (?                   ) out hi
>  gpio-35  (?                   ) out hi
>  gpio-37  (?                   ) out lo
>  gpio-38  (?                   ) out hi
>  gpio-40  (?                   ) out hi
>
> # uname -a
> Linux LS-WXL 3.16.0-4-kirkwood #1 Debian 3.16.7-ckt7-1 (2015-03-01)
> armv5tel GNU/Linux
> # mount -t debugfs none /sys/kernel/debug
> # cat  /sys/kernel/debug/gpio
> GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio:
>  gpio-28  (HDD0 Power          ) out hi
>  gpio-29  (HDD1 Power          ) out hi
>
> GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio:
>  gpio-34  (lswxl:red:hdderr0   ) out hi
>  gpio-35  (lswxl:red:hdderr1   ) out hi
>  gpio-37  (lswxl:red:func      ) out lo
>  gpio-38  (lswxl:amber:info    ) out hi
>  gpio-40  (lswxl:blue:power    ) out hi

For above gpio-XX and it's string, I know there're gpio pin definition
errors for gpio 32-49.
Now I understand gpio 32-49 should be defined as gpio1 XX, and XX
should be real pinnumber - 32.
e.g. GPIO 37 should be defined as "gpio1 5"

After I modified DTS as above new gpio[01] pinnumber, the debug info is like:

GPIOs 0-31, platform/f1010100.gpio, f1010100.gpio:
 gpio-28  (HDD0 Power          ) out hi
 gpio-29  (HDD1 Power          ) out hi

GPIOs 32-49, platform/f1010140.gpio, f1010140.gpio:
 gpio-37  (USB Power           ) out hi
 gpio-41  (Function Button     ) in  hi (act lo) - IRQ edge  (clear  )
 gpio-42  (Power-on Switch     ) in  lo (act hi) - IRQ edge  (clear  )
 gpio-43  (Power-auto Switch   ) in  hi (act lo) - IRQ edge  (clear  )

So gpio-37 is HIGH by default now.
Although gpio export is still not working on previously reported
kernel version, my problem seems get solved.

Cheers,
Roger