Hi Felipe, According to the newest OTG & EH spec (On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification July 27, 2012 Revision 2.0 version 1.1a), the OTG descriptor is needed for B device, even for peripheral-only B device (see chapter 6.1 OTG Descriptor). At current code, otg_descriptor is only included at descriptors when CONFIG_USB_OTG is defined, and .bmAttributes is assigned as (USB_OTG_SRP | USB_OTG_HNP) at otg descriptor, so for EH B-ports, OTG B-devices, and Peripheral-only B-devices, we have to enable CONFIG_USB_OTG, and declare us as SRP and HNP capable. My question is: do we need to support SRP and HNP at current dual-role switch udc driver as well as enable CONFIG_USB_OTG or we include otg_descriptor unconditionally, and only add CONFIG_USB_OTG for ".bmAttributes = USB_OTG_SRP | USB_OTG_HNP" at code? Thanks. -- Best Regards, Peter Chen -- 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
