GPIO Wake-up on ConnectCore

Question

I am trying to wake up my system (ConnectCore 6UL SBC Pro, with dey 3.0) from suspend by using edge interrupts on a GPIO pin, with no success so far.

I have the latest MCA firmware.

I have tried with the method in the documentation (https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6ul/bsp_r_power-mgmt), for example like
`gpiomon --num-events 1 --rising-edge mca-gpio 1 &`
Suspend followed by edges on the gpio pin does not wake the system. The edges are detected by gpiomon when not sleeping.

I also tried adding
&mca_gpio {
pwroff-wakeup-capable-ios = <1>
};
to the device tree as per some older documentation, but that didn't change anything.

Am I missing something? Is there something more that should be enabled somewhere to enable the wakeup?

Answer 1

Here is an example:



These MCA gpio pins are IRQ capable: MCA_IO0/1/2/5 (index 504,505,505,509).



In this case you don´t need to enable the wakeup register, once you configure the MCA GPIO edge the IRQ will be avaible.



So to configure the MCA_IO1







root@ccimx6ulsbc:~# cat /proc/interrupts | grep gpiolib



root@ccimx6ulsbc:~# echo 505 > /sys/class/gpio/export



root@ccimx6ulsbc:~# echo in > /sys/class/gpio/gpio505/direction



root@ccimx6ulsbc:~# echo rising > /sys/class/gpio/gpio505/edge







Once you have done this, you are done and the GPIO will be used as a wakeup source







root@ccimx6ulsbc:~# cat /proc/interrupts | grep gpiolib



246: 0 mca-gpio-irq 1 Edge gpiolib

Comments

I realized I had made a faulty assumption that I could use the 3V3 power line (from the J30 connector) during standby. By using other means to create the edge, the system wakes up as expected. Thanks for the example!

Answer 2

&mca_gpio {
pwroff-wakeup-capable-ios = <1>
};
this should work.