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From:   Sven Van Asbroeck <thesven73@gmail.com>
Date:   Thu, 18 Apr 2019 13:34:04 -0400
Message-ID: <CAGngYiUPZ+g4eXJKvgA9GSJXgOFAAf6Q3qqAheiqNSnJ+Dbx+w@mail.gmail.com>
Subject: Re: [PATCH v10 0/7] Add Fieldbus subsystem + support HMS Profinet card
To:     "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Lee Jones <lee.jones@linaro.org>, mark.rutland@arm.com,
        =?UTF-8?Q?Andreas_F=C3=A4rber?= <afaerber@suse.de>,
        treding@nvidia.com, David Lechner <david@lechnology.com>,
        noralf@tronnes.org, johan@kernel.org,
        Michal Simek <monstr@monstr.eu>, michal.vokac@ysoft.com,
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        geert+renesas@glider.be, robin.murphy@arm.com,
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Hi Enrico,

On Thu, Apr 18, 2019 at 4:34 AM Enrico Weigelt, metux IT consult
<lkml@metux.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