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Date:   Sat, 27 Feb 2021 11:38:08 +0800
From:   liulongfang <>
To:     Alan Stern <>
CC:     <>, <>,
        <>, <>,
Subject: Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller

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.
Longfang Liu

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