linux-kernel - Re: [PATCH v8 0/6] Add Fieldbus subsystem + support HMS Profinet card

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Date:   Mon, 11 Mar 2019 12:13:39 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     robh+dt@...nel.org, Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>, mark.rutland@....com,
        Andreas Färber <afaerber@...e.de>,
        treding@...dia.com, David Lechner <david@...hnology.com>,
        noralf@...nnes.org, johan@...nel.org,
        Michal Simek <monstr@...str.eu>, michal.vokac@...ft.com,
        Arnd Bergmann <arnd@...db.de>, john.garry@...wei.com,
        geert+renesas@...der.be, robin.murphy@....com,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        sebastien.bourdelin@...oirfairelinux.com, icenowy@...c.io,
        Stuart Yoder <stuyoder@...il.com>, maxime.ripard@...tlin.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 0/6] Add Fieldbus subsystem + support HMS Profinet card

On Mon, Mar 11, 2019 at 01:02:34PM -0400, Sven Van Asbroeck wrote:
> On Fri, Feb 8, 2019 at 9:14 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > Well, who wants this code?  Who uses it?  Find those people and get them
> > to review it.  If no one wants it or uses it, that kind of implies that
> > it's not needed :)
> 
> We have customers who (will) talk to this ABI from userspace, but they are
> not 'Linux-y' enough to come to the mailing list and meaningfully review
> the userspace ABI.
> 
> IMHO the current reality of Fieldbus on Linux is companies rolling their own
> proprietary out-of-tree interfaces and drivers. They do this partly because
> there is no existing community or infrastructure. So there is no incentive
> to be involved with mainline, which could also explain why no-one is commenting
> on this Fieldbus ABI.
> 
> Chicken-and-egg problem ?
> 
> Greg, could I convince you to take this Fieldbus subsystem in drivers/staging?
> Perhaps its presence may kickstart or seed a Linux Fieldbus community.
> Being in staging/ also means that we can tweak the userspace ABI to our
> heart's content if more people/requirements come in.
> 
> If there's been no meaningful activity in, say, one year from now, you may
> decide to send this whole subsystem to /dev/null.

That sounds like a good plan, I'll take that.  Want to respin the
patches with the code in drivers/staging/ and I'll be glad to queue them
up after 5.1-rc1 is out.

thanks,

greg k-h