linux-kernel - Re: [PATCH 0/3] thunderbolt: Update XDomain vendor properties dynamically

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Message-ID: <2025081128-cartwheel-grandly-a9be@gregkh>
Date: Mon, 11 Aug 2025 07:28:21 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: Mario Limonciello <superm1@...nel.org>,
	"Rangoju, Raju" <raju.rangoju@....com>, linux-usb@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	andreas.noever@...il.com, michael.jamet@...el.com,
	westeri@...nel.org, YehezkelShB@...il.com, bhelgaas@...gle.com,
	Sanath.S@....com
Subject: Re: [PATCH 0/3] thunderbolt: Update XDomain vendor properties
 dynamically

On Mon, Aug 11, 2025 at 06:53:07AM +0200, Mika Westerberg wrote:
> On Fri, Aug 08, 2025 at 04:13:28PM +0100, Greg KH wrote:
> > > 0004 USB4
> > > 
> > > sounds good to me. In USB4 there is no "root hub". It's called host router
> > > (but we do have device routers that are called USB4 hubs for added
> > > confusion ;-).
> > > 
> > > But I'm fine with other numbers too, does not matter if you want to save it
> > > for some future USB variant.
> > 
> > Ok, use 0004 for this.  But what should I use for the text string here
> > in the usb.ids file?
> 
> Thanks! I'll cook up a patch changing these.
> 
> I don't think it should be in usb.ids because it is not visible anywhere
> except over USB4 link (between hosts). You don't see this through USB 2.x
> or 3.x.

It goes in usb.ids as that is what I use to keep track of all of the
assigned product ids for this vendor :)

So, should I use "USB 4.0 host link" or something else?

thanks,

greg k-h