On Thu, 29 Jun 2017, Josh Litherland wrote: > I've been tinkering with developing a USB touchscreen gadget device on > a board using a Mentor USB peripheral controller (driver musb-hdrc). > The gadget I'm developing runs in userspace via gadgetfs. From what > I've been able to tell, there's no way to run multiple gadget devices > simultaneously using this controller, do I have that correct? Is > there a peripheral controller out there that allows attachment of > multiple gadgets (and is supported in Linux)? It depends on exactly what you mean. Most USB device controllers allow a single gadget driver to provide multiple functions. For example, you might have one gadget with both a serial port function and a mass-storage function. Is that as good as having multiple gadgets? There are almost no device controllers that allow for multiple devices. The only one I have ever heard of is the Aspeed BMC SoC, which includes a built-in virtual hub with facilities for 5 gadget drivers beneath it: http://marc.info/?l=linux-usb&m=149842193906284&w=2 But since that controller is only available on that particular SoC, it probably isn't what you're looking for. Bear in mind that there's nothing to prevent you hooking up multiple device controllers in a single system. Alan Stern -- 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
