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Date:   Wed, 17 Apr 2019 17:25:52 +0200
From:   "Enrico Weigelt, metux IT consult" <>
To:     Sven Van Asbroeck <>
Cc:     Rob Herring <>,
        Linus Walleij <>,
        Lee Jones <>,,
        Andreas Färber <>,, David Lechner <>,,,
        Michal Simek <>,,
        Arnd Bergmann <>,
        Greg KH <>,,,,
        Paul Gortmaker <>,,,
        Stuart Yoder <>,
        "J. Kiszka" <>,,
        Linux Kernel Mailing List <>,
        netdev <>
Subject: Re: [PATCH v11 2/7] anybus-s: support HMS Anybus-S bus

On 17.04.19 00:00, Sven Van Asbroeck wrote:


>> But this port supports probing ?>> (so it's, bit like a single usb port w/o hub ;-))> > Yes, that's
exactly it.
Okay, then your approach introducing a bus_type is correct, IMHO.

>> I guess that things like introducing new bus types or device classes>> are something that subsystem maintainers wanna be aware of :)>>>
> fieldbus_dev is a new subsystem.
> At first I attempted to mainline the anybus-s drivers with a 'roll-your-own'
> userspace API, but the feedback I got was: this userspace API should
> really be generic... So this is my attempt to create a generic fieldbus_dev
> API !

Yes, it's an own class of devices, many other (semantically) simiar
devices out there. Therefore, an own subsystem for that is a good idea.

But: I'd rather call it it "iec61158" instead of fieldbus", as there're
lots of different fieldbus types (eg. MVB has pretty different semantics
than iec61158)

> It's almost certainly insufficient, but it's a start. Ideally, this
> should get lots of review from people in the industry, but response 
> to this patchset has been underwhelming. 

It's still a niche, at least for Linux. Only few people here ever had
their hands on such PLC systems.


Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering -- +49-151-27565287

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