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

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Date:   Thu, 18 Apr 2019 10:32:17 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Rob Herring <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>,
        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

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.

Can't tell when exactly the MVB issue comes up again, or whether
the device will be connected to WTB instead. But I'm sure either one
will come in a few years.

> Would it support multiple plc process memories?

Not quite. More like SNMP. Theoretically, (parts of) that could be
somehow mapped into a logical process memory, but handling async
signals could be tricky (at least we'd need a mtime for each field
and an change notification mechanism).

--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287