linux-kernel - Re: [PATCH pci] PCI: remove the PCI_VENDOR_ID

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Date:   Thu, 30 Nov 2023 11:10:19 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Vladimir Oltean <vladimir.oltean@....com>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, Wasim Khan <wasim.khan@....com>,
        Wei Fang <wei.fang@....com>, Clark Wang <xiaoning.wang@....com>
Subject: Re: [PATCH pci] PCI: remove the PCI_VENDOR_ID_NXP alias

On Wed, Nov 29, 2023 at 05:38:27PM -0600, Bjorn Helgaas wrote:
> [+cc Greg because these mergers & spinoffs happen all the time, and
> pci_ids.h doesn't necessarily need to keep up, so maybe there's
> precedent for what to do here]

Yes, the precedent is to leave it alone.

> On Wed, Nov 22, 2023 at 05:42:41PM +0200, Vladimir Oltean wrote:
> > What is today NXP is the result of some mergers (with Freescale) and
> > spin-offs (from Philips).
> > 
> > New NXP hardware (for example NETC version 4.1 of the NXP i.MX95
> > SoC) uses PCI_VENDOR_ID_PHILIPS. And some older hardware uses
> > PCI_VENDOR_ID_FREESCALE.
> > 
> > If we have PCI_VENDOR_ID_NXP as an alias for PCI_VENDOR_ID_FREESCALE,
> > we end up needing something like a PCI_VENDOR_ID_NXP2 alias for
> > PCI_VENDOR_ID_PHILIPS. I think this is more confusing than just spelling
> > out the vendor ID of the original company that claimed it.
> > 
> > FWIW, the pci.ids repository as of today has:
> > 1131  Philips Semiconductors
> > 1957  Freescale Semiconductor Inc
> > 
> > so this makes the kernel code consistent with that, and with what
> > "lspci" prints.
> 
> Hmm.  I can't find the 0x1957 Vendor ID here:
> https://pcisig.com/membership/member-companies, which is supposed to
> be the authoritative source AFAICS.
> 
> Also, that page lists 0x1131 as "NXP Semiconductors".
> 
> There's a contact email on that page if it needs updates.
> 
> I don't quite understand the goal here.  The company is now called
> "NXP", and this patch removes PCI_VENDOR_ID_NXP (the only instance of
> "NXP" in pci_ids.h) and uses PCI_VENDOR_ID_FREESCALE (which apparently
> does not exist any more)?
> 
> Why would we remove name of the current company and use the name of a
> company that doesn't exist any more?

Yes, this seems very odd.  What is the reason for any of this other than
marketing?  Kernel code doesn't do marketing :)

thanks,

greg k-h