Hi, > > On most platforms, there is only one device controller available. > > In this case, we desn't care the UDC's name. So let's ignore the > > name by setting 'UDC' to 'any'. > > Hmm libubsgx allows to do this for a very long time. You simply pass > NULL instead of pointer to usbg_udc. > > It is also possible to do this from command line, just simply: > > $ echo `ls -1 /sys/class/udc | head -n 1` > UDC > > So if we can easily do this from user space what's the benefit of adding > this special "any" keyword to kernel? > Well, it is just for *easy to use*. Looking up /sys/class/udc mostly can be skipped. The UDC core support this convenience behavior, so why don't we export it with a little change? > > And also we can change UDC name > > at any time if it is not binded (no need set to "" first). > > > > Not sure if: > > $ echo "" > UDC > > is really a problem. Personally I'm quite used to situation in which I > have to turn the light off before turning it on once again;) > That is not a problem. But just avoid pseudo 'busy'. If gadget is not bind, it is free to reconfigure it. So seem no need block re-configuration. In a word, this patch is just an improvement, not to fix any issues or add new function. > Cheers, > -- > Krzysztof Opasiak > Samsung R&D Institute Poland > Samsung Electronics Thanks, Du, Changbin -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
