Hi Min, On Tue, Jan 22, 2019 at 05:36:13PM +0800, Min Guo wrote: > Hi Bin, > > Sorry to bother you again, I encounter a problem about the extcon > property. > > I don't find a common driver describing the usb-connector. Is > there any driver that I can refer to, specially the way to switch MUSB > controller between host and device mode? > If it needs to implement by myself, is it possible to emulate an > usb-connector driver by extcon-usb-gpio, and also use the notifier > mechanism or can you give me some advices? I am afraid I am unable to help you on this. I wasn't really pay attention when usb-connector was introduced and not sure how it can replace extcon. Now after read usb-connector.txt, it seems the binding only defines a/b/c-connector, but not ab-connector, and there is no enough information (at least for me) explaining how VBUS and ID fix into this usb-connector binding. Maybe Rob can provide some hint. Regards, -Bin.