I'm trying to use an external button to control power on/off on BBB. I 
currently have a momentary button wired to pwr_btn and pulled up high via 
3.3V pin. The issue is that 3.3v is not enabled by default in sleep mode. I 
have no problem pressing the button to pull ground and shut down the 
beaglebone, but then when it goes to sleep, 3.3v (LDO2) rail shuts off 
which pulls the pwr_but ground which then immediately triggers power on 
again.

How would I enable LDO2 in sleep mode? I read through the user guild 
(http://www.ti.com/lit/ds/symlink/tps65217c.pdf) and couldn't find any 
answers.

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