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[Botao Sun <botao.sun@xxxxxxxxxx>]

on ARM Versatile Express A9 board with Linaro Android image:

https://android-build.linaro.org/builds/~linaro-android/vexpress-
linaro-13.09-release/#build=6

For files under path "/sys/class", it shows as:

root@vexpress:/sys/class # ls -la
drwxr-xr-x root     root              2013-09-24 11:39 bdi
drwxr-xr-x root     root              2013-09-24 11:39 block
drwxr-xr-x root     root              2013-09-24 11:39 bsg
drwxr-xr-x root     root              2013-09-24 11:39 firmware
drwxr-xr-x root     root              2013-09-24 11:39 graphics
drwxr-xr-x root     root              2013-09-24 11:39 hwmon
drwxr-xr-x root     root              2013-09-24 11:39 input
drwxr-xr-x root     root              2013-09-24 11:39 leds
drwxr-xr-x root     root              2013-09-24 11:39 mdio_bus
drwxr-xr-x root     root              2013-09-24 11:39 mem
drwxr-xr-x root     root              2013-09-24 11:39 misc
drwxr-xr-x root     root              2013-09-24 11:39 mmc_host
drwxr-xr-x root     root              2013-09-24 11:39 mtd
drwxr-xr-x root     root              2013-09-24 11:39 net
drwxr-xr-x root     root              2013-09-24 11:39 power_supply
drwxr-xr-x root     root              2013-09-24 11:39 regulator
drwxr-xr-x root     root              2013-09-24 11:39 rtc
drwxr-xr-x root     root              2013-09-24 11:39 scsi_device
drwxr-xr-x root     root              2013-09-24 11:39 scsi_disk
drwxr-xr-x root     root              2013-09-24 11:39 scsi_host
drwxr-xr-x root     root              2013-09-24 11:39 sound
drwxr-xr-x root     root              2013-09-24 11:39 switch
drwxr-xr-x root     root              2013-09-24 11:39 timed_output
drwxr-xr-x root     root              2013-09-24 11:39 tty
drwxr-xr-x root     root              2013-09-24 11:39 vc
drwxr-xr-x root     root              2013-09-24 11:39 vtconsole
root@vexpress:/sys/class # 

There is no "gpio" directory there. However, I found file "gpio" under
the path "/sys/kernel/debug"

/sys/kernel/debug/gpio

And the content of this file shows:

GPIOs 0-10, platform/10000000.sysreg, vexpress-sysreg:
 gpio-0   (mmci-pl18x (cd)     ) in  hi
 gpio-1   (mmci-pl18x (wp)     ) in  lo
 gpio-3   (v2m:green:user1     ) out lo
 gpio-4   (v2m:green:user2     ) out lo
 gpio-5   (v2m:green:user3     ) out lo
 gpio-6   (v2m:green:user4     ) out lo
 gpio-7   (v2m:green:user5     ) out lo
 gpio-8   (v2m:green:user6     ) out hi
 gpio-9   (v2m:green:user7     ) out lo
 gpio-10  (v2m:green:user8     ) out lo

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https://bugs.launchpad.net/bugs/1229658

Title:
  Information is unavailable on "Clocks" & "Gpio" pages in powerdebug
  0.7.1

Status in Powerdebug - a tool to help ARM developers:
  New

Bug description:
  On ARM Versatile Express A9 board with Linaro Android image:

  https://android-build.linaro.org/builds/~linaro-android/vexpress-
  linaro-13.09-release/#build=6

  Information is unavailable on "Clocks" & "Gpio" after launched
  powerdebug version 0.7.1, error output shows as below:

  root@vexpress:/ # powerdebug                                                  
  failed to initialize clock details (check debugfs)
  error: unable to open directory /sys/class/gpio
  failed to initialize gpios
  root@vexpress:/ # 

  Please refer to attachment to get snapshot pictures.

  Note: Please run powerdebug in ADB shell, which the output is well
  formated, however the failure is same as run in serial console.

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