On Wed, Sep 03, 2014 at 02:48:43PM +0530, Anjana V Kumar wrote: > Hi, > > This is regarding an issue we are facing with the gadget serial driver > (driver/usb/gadget/serial.c). > > We have a hardware limitation and the USB hardware can only have > bconfigurationvalue 0 or 1. what kind of limitation is this. Configuration value is a SW-only choice. What HW are you using ? Which kernel are you using ? Do you have logs of the problem ? > In the CDC ACM config in gadget serial driver the configuration value > is set to 2. Is there a specific reason why this was done? > > We see that, the three configurations listed in serial driver (CDC > ACM, CDC OBEX, generic serial) cannot be present together as per the > current implementation. Is there a specific reason why the > configuration values were set as 1, 2 and 3 instead of setting all to > 1? well, setting configuration 0 means that you're not selecting any configuration. Basically you go back to "Addressed" state, so you can't use configuration 0 for anything, really. -- balbi
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