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From:   Sven Van Asbroeck <thesven73@gmail.com>
Date:   Tue, 16 Apr 2019 18:12:41 -0400
Message-ID: <CAGngYiVJwRh_ESLfSYWak4RU60T2D1HW0-3Hg1CZbRjWhaSN5Q@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:     Rob Herring <robh+dt@kernel.org>,
        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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        sebastien.bourdelin@savoirfairelinux.com, icenowy@aosc.io,
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On Tue, Apr 16, 2019 at 5:21 PM Enrico Weigelt, metux IT consult
<lkml@metux.net> wrote:
>
>
> Yet another question: does each fieldbus_dev instance talk to exactly
> one plc process memory, or can there be many ?
>
> Having separate device nodes per plc process memory seems a good idea
> for finer access control (via chown+friends).
>

PS do you have a specific fieldbus device in mind which could be added
to Linux? Would it support multiple plc process memories?

Sven