Comment 18 for bug 1229658

hello Botao,

Here change is needed from kernel side. The issue is, in the vexpress
kernel the GPIO_SYSFS directive is not enabled (checked in the 331 build
config file). Its one of the prerequisites for the feature to work.
Please create a new bug for that and close this one. thanks

On Thursday 22 May 2014 12:47 PM, Botao Sun wrote:
> Hi Sanjay, the issue still exists on vexpress Android build #331
>
> https://android-build.linaro.org/builds/~linaro-android/vexpress-
> linaro/#build=331
>
> The GPIO column is empty there. The version of PowerDebug now shows
> 0.7.2, have your patch been merged?
>
> ** Description changed:
>
> 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 formatted,
> however the failure is same as run in serial console.
>
> Latest update for this bug is the behaviour shows as described in
> comment #9, only GPIO information is unavailable.
>
> For the bug on Samsung Arndale Android, please refer to:
>
> https://bugs.launchpad.net/linaro-powerdebug/+bug/1298171
>
> ###########################################
> This issue is observed on following images:
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-13.09-release/#build=6
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-13.11-release/#build=2
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-13.12-release/#build=1
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-14.01-release/#build=6
> ###########################################
> From build #247, only "Gpio" page is empty:
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro/#build=247
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-14.02-release/#build=11
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro/#build=271
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-14.03-release/#build=1
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro/#build=297
> https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro-14.04-release/#build=1
> + https://android-build.linaro.org/builds/~linaro-android/vexpress-linaro/#build=331
>
> ** Changed in: linaro-powerdebug
> Status: Fix Released => In Progress
>

--
sanjay