I am very interested in this as well. Suspend/resume looks to be supported according to the datasheet:
I suspect you’d need to send the signal from the 8051 core and maybe a heads up to linux kernel that system is about to go down?
I’ve never worked with the 8051 or any embedded stuff really but I have devmem and sdcc set up. I’ll try writing a program to load into 8051 sram that sleeps the main core for a few seconds and then wakes it.
I’d be happy to work with someone over IRC/Matrix figuring out how to implement this.