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Some peripherals have their clocks automatically gated in PM1+ modes, so they cannot operate. This new mechanism gives peripherals a way to prohibit PM1+ modes so that they can properly complete their current operations before entering PM1+. This mechanism is implemented with peripheral functions registered to the LPM module. These functions return whether the associated peripheral permits or not PM1+ modes. They are called by the LPM module each time PM1+ might be possible. If any of the peripherals wants to block PM1+, then the system is only dropped to PM0. Partly from: George Oikonomou Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>