[coreboot] Power off in Coreboot?

[mturney at codeaurora.org]

Folks,
We are working through the PMIC requirements for Coreboot on our 
hardware.
I understand the need for Coreboot to command a reboot, e.g. VerStage 
detects FW_A is bad and wants to try FW_B.
What is not clear is what is the use-case for Coreboot to command a 
power-off.

In grepping the sources I see the API is provided and only used in a 
handful of cases, mainly x86.

On an ARMv8 target is there a power-off use-case for Coreboot?
This is strictly from Coreboot perspective, not Depthcharge.
Cheers,
T.mike