I have a wandboard iMX6-solo platform with Yocto build. I can set UART as power resume source, but I am not able to do it with GPIO.
with UART, I can do
echo enabled > /sys/de is no /platform/imx-uart.0/tty/ttymxc0/power/wakeup
echo mem > /sys/power/state
Then board go to sleep. And any UART activity will wake up CPU.
But there is NO /sys/class/gpio/gpio<n>/power/wakeup in the gpio /sys/class. I wonder if there is any .config option I need to set in the Linux kernel? Our do I have to setup the GPIO's IRQ as source of wakeup, if so, how?