linux-kernel - Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller

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Message-ID: <20210226163004.GB1392547@rowland.harvard.edu>
Date:   Fri, 26 Feb 2021 11:30:04 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Longfang Liu <liulongfang@...wei.com>
Cc:     gregkh@...uxfoundation.org, mathias.nyman@...el.com,
        linux-usb@...r.kernel.org, yisen.zhuang@...wei.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller

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