On 2021/2/27 0:30, Alan Stern wrote: > On Fri, Feb 26, 2021 at 04:21:37PM +0800, Longfang Liu wrote: >> Our current XHCI hardware controller has been customized to only >> support USB 2.0 ports. When using the current xhci driver, an xhci >> controller device and an ehci controller device will be created >> automatically. > > That sentence makes no sense at all. An EHCI controller device is a > piece of hardware. How can an xHCI driver, which is a piece of > software, create a piece of hardware? > > Alan Stern > . > The hardware device is a complete USB3.0 controller, but I hope to support a USB2.0-only mode through software configuration. Thanks. Longfang Liu
