--- On Wed, 6/2/10, Jon Povey <Jon.Povey@xxxxxxxxxxxxxxx> wrote: > From: Jon Povey <Jon.Povey@xxxxxxxxxxxxxxx> > Subject: MUSB: Idea: board-specific OTG ID pin interrupt support > To: "linux-usb@xxxxxxxxxxxxxxx" <linux-usb@xxxxxxxxxxxxxxx>, "davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx" <davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx> > Cc: "felipe.balbi@xxxxxxxxx" <felipe.balbi@xxxxxxxxx>, "Sergei Shtylyov" <sshtylyov@xxxxxxxxxx> > Date: Wednesday, June 2, 2010, 5:52 PM > Playing around with MUSB OTG on TI > DM355 I am having some trouble getting A-B role switching > working. > > On my board by happy design foresight, USB ID is also wired > to a GPIO. I am currently having a go at hacking an ID > interrupt into the MUSB driver to prod the state machine. I don't recall having difficulties getting the ID-based role switching to behave with the DM355 EVM... GPIO IRQs should not be needed. Of course, maybe my memory has faded; this is the type of situation where Mentor's silicon design team gratuitiously disregarded OTG specs. In fact ISTR some chicken/egg issues specifically regarding the ID pin status bit in whichever register held it... making host vs perhipheral initialization a real PITA. Maybe ULPI hooks would help. Regardless, I did see the cable based role switch logic working without such gpio logic. - Dave -- 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
