I am working on getting our system (OMAP3530 and TPS65950) to idle and sleep at its lowest power states possible. I had assumed that enabling off mode (echo 1 > /debug/pm_debug/enable_off_mode) would lower the system power, but instead it goes up! It is most obvious in suspend mode, where it uses 27mA more current from the TPS65950's 4.2V supply when enable_off_mode is 1 than when it is 0.
Note: Also posted to OMAP forum