linux-kernel - Re: Why no USB id list in the kernel sources?

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Message-ID: <20130705214318.GA20918@kroah.com>
Date:	Fri, 5 Jul 2013 14:43:18 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Cc:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Why no USB id list in the kernel sources?

On Fri, Jul 05, 2013 at 11:34:05PM +0200, Michael Opdenacker wrote:
> Hi,
> 
> I'm wondering why there is no include/linux/usb_ids.h (or
> include/linux/usb/ids.h) file in the same way there is a
> include/linux/pci_ids.h for PCI.

Because that way lies madness, we have learned from our mistakes and do
not want to repeat them again :)

It turns out that the pci_ids file isn't a good idea, it's a merge mess,
and only really works when you have ids that are shared across different
drivers.  In the end, that is a very small number, and it's just not
worth the time and effort to do this in a centralized way.

Hope this helps explain things, if you want more details, dig into the
linux usb mailing list about 10-15 years ago when this decision was
made.

thanks,

greg k-h
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