linux-kernel - Re: [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card

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Date:   Thu, 18 Apr 2019 13:34:04 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     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>,
        Greg KH <gregkh@...uxfoundation.org>, 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>,
        "J. Kiszka" <jan.kiszka@...mens.com>, maxime.ripard@...tlin.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card

Hi Enrico,

On Thu, Apr 18, 2019 at 4:34 AM Enrico Weigelt, metux IT consult
<lkml@...ux.net> wrote:
>
> On 17.04.19 00:12, Sven Van Asbroeck wrote:
>
> > PS do you have a specific fieldbus device in mind which could be added
> > to Linux?
>
> I actually had some Duagon MVB controllers (Ionia) in the pipeline.
> That's stalled for quite some time, as my customer doesn't need the
> MVB communication yet, for now just the machine as generic Linux host
> w/ ADCs+DIOs.
>

If you have a fieldbus device you want to add to mainline Linux, and
you wish to piggy-back onto the fieldbus_dev subsystem, then we can
discuss fieldbus API changes/additions/improvements during the
patch review stage.

It's my experience that good userspace APIs evolve from practical
requirements, not top-down theoretical design. The staging/ location
allows us to take an evolutionary approach.

Sven