Hi All, I have a basic doubt on root hubs. I'm working on a media SoC which has 1 USB interface which can function both as a host and a device (would this qualify for OTG? the datasheet doesn't mention OTG though) and an on-chip PHY. Here's an excerpt from the datasheet about the USB host controller: "The USB 2.0 Embedded Host Controller is fully compliant with the USB 2.0 specification and the Enhanced Host Controller Interface (EHCI) specification revision 1.0. The controller supports high-speed (480Mbps) transfers. The controller comprehends the high-speed, full-speed and low-speed data ranges providing compatibility with a full range of USB devices. The full-speed and low-speed operations are supported through the EHCI software stack via a transaction translation layer." Now my question is, does the EHCI also function as a root hub? As in the root hub is incorporated into the host controller? If I have to add another USB port to such a device, will it be possible to connect it to the existing root hub? I'm asking this because its mentioned that the host controller also has an on-chip PHY, and as I understand I'll have to connect my second port directly onto the USB bus and not to the PHY interface. Is my understanding correct? Thanks, -mandeep -- 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
