Hello Roger,
On 01/13/2016 02:11 PM, Roger Shimizu wrote:
> Package: src:linux
> Version: 3.16.7-ckt20-1+deb8u1
> Severity: normal
> Control: notfound -1 3.16.7-ckt4-3
> Control: found -1 3.16.7-ckt7-1
> Control: found -1 3.16.7-ckt20-1+deb8u1
> Control: notfound -1 4.2.6-3~bpo8+2
> Control: notfound -1 4.3.3-5~bpo8+1
> Control: notfound -1 4.4~rc8-1~exp1
>
> 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
Side note: you can shorten that to:
echo 37 > /sys/class/gpio/export
echo high > /sys/class/gpio/gpio37/direction
> The 3-line script runs well on Jessie rootfs + kernel listed below:
> - 3.16.7-ckt4-3
> - 4.2.6-3~bpo8+2
> - 4.4~rc8-1~exp1
> But fails from 3.16.7-ckt7-1 to 3.16.7-ckt20-1+deb8u1 (latest jessie kernel).
>
> The error message is like this:
> # echo 37 >/sys/class/gpio/export
> -bash: echo: write error: Device or resource busy
Looking at the device tree I'd say it's correct that the gpio cannot be
controlled from user space because it's used to enable usb.
A quick look at the provided dmesg for 3.16.7-ckt7-1 makes me expect
that usb works there without the gpio commands above? If so there is no
bug, right?
Best regards
Uwe
