Re: kernel 4.9.2-200.fc25.armv7hl

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On Sun, Jan 15, 2017 at 4:09 PM, Richard Ryniker <ryniker@xxxxxxxxxxxx> wrote:
> Additional problem on Raspberry Pi (model 3):  there is no:
>
> /sys/class/gpio

The sysfs interface is deprecated [1] so I had disabled it on rawhide.
I didn't intend on this change coming back into the stable releases
but I must have screwed something up. It'll be back in F-25 with the
4.9.4 kernel which should be built today.

> This does exist with the 4.8.15-300 kernel, but it has problems:
>
> [root@RPi3-1 gpiochip970]# echo 993 >/sys/class/gpio/export
> [root@RPi3-1 gpiochip970]# echo 1 >  /sys/class/gpio/gpio993/value
> bash: echo: write error: Operation not permitted
> [root@RPi3-1 gpiochip970]# ls -l   /sys/class/gpio/gpio993
> lrwxrwxrwx. 1 root root 0 Jan 15 10:24 /sys/class/gpio/gpio993 -> ../../devices/platform/soc/3f200000.gpio/gpiochip0/gpio/gpio993
> [root@RPi3-1 gpiochip970]# ls -l /sys/devices/platform/soc/3f200000.gpio/gpiochip0/gpio/gpio993
> total 0
> -rw-r--r--. 1 root root 4096 Jan 15 10:24 active_low
> lrwxrwxrwx. 1 root root    0 Jan 15 10:24 device -> ../../../gpiochip0
> -rw-r--r--. 1 root root 4096 Jan 15 10:24 direction
> -rw-r--r--. 1 root root 4096 Jan 15 10:24 edge
> drwxr-xr-x. 2 root root    0 Jan 15 10:24 power
> lrwxrwxrwx. 1 root root    0 Jan 15 10:24 subsystem -> ../../../../../../../class/gpio
> -rw-r--r--. 1 root root 4096 Jan 15 10:24 uevent
> -rw-rw-rw-. 1 root root 4096 Jan 15 10:27 value
> [root@RPi3-1 gpiochip970]# echo 1 > /sys/devices/platform/soc/3f200000.gpio/gpiochip0/gpio/gpio993/value
> bash: echo: write error: Operation not permitted
> [root@RPi3-1 gpiochip970]#

[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a0910d72afc69b25703f7be9bf7d13f18937a478
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