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How to know wakeup cause after a sleep/standby mode?

Pierre Savary
Prodigy 140 points
Other Parts Discussed in Thread: TPS65950, DM3730

Hi all,

We need some help about power management. We want to know which IRQ waked-up our custom board. In which registers can we read the wake up cause? In our design the board can be wakeup by RTC or GPIO.

To use sleep/standby mode, we use this command : "echo mem > /sys/power/state". 

Currently we use DM3730 + TPS65950 with kernel version 3.0.28 .

Thanks in advance,

Pierre