Hi I am looking for a convenient way to power gate specific single device when the platform is running in backup mode - the platform lost main power supply and it's on backup buttery now. The intention is to save max power in backup mode and switch off all unnecessary blocks.
I could not find anything standard that let me power gate single device from userland. Perhaps it's considered as a too risky operation to expose to the user. I don't want to touch drivers too much as well not to make them dependant on extra system feature. Better to have a separate module that handles this system mode and forces some drivers to unload/power gate their HW. Are there already some proven solutions/ideas around the kernel that can be used straight away? Suggestions appreciated. /Waldek
