Linux/AM3359: Use UART4 as wakeup source

Yep, I suppose is not possible. Then I'm wondering if I can can use the UART4_TX pin configured as GPIO as wakeup source.

I see that UART4_TX is pin gpio0_31 and the GPIO0 bank is able to generate wakeup interrupts, I think that using /sys/class/gpio/gpioXX/power/wakeup is the way to do. The problem is that there isn't any "wakeup" file under power directory. So, how I should proceed to activate it?

More info: I tried with my BBB, using the latest AM335x PSP and trying to wakeup from gpio0_5 doesn't works, from what I see this is an unimplemented feature.

These are good news :) so probably I did something wrong. Can you help me and explain me how make it work.

Actually I'm using BBB with ti-processor-sdk version 03.02.00.05. I configured gpio0_5 as input and then suspend the system, set gpio0_5 high or low did not wake-up the system.

Should work simply adding the "gpio-key,wakeup" propriety in my gpio-key dts entry?

I will review my code to catch if I did something wrong.