Chipidea usb otg support for IMX/MXS (device functionality)

[Chen Peter-B29397]

> >
> > Just measure the voltage of your otg vbus pin.
> 
> Ok, I see it's 2.25 volts after I disconnect the microB-A thing . I
> should see
> 0.8V constantly with nothing connected on the port?
> 

You should see the voltage of vbus pin is less than 0.8v when
nothing is connected, we use B_SESSION_VALID (0.8v) to judge
it is connected or not.

You get 2.25 all the time or it is discharged very slowly?

Best regards,
Peter