linux-kernel - Re: [PATCH anybus v3 0/6] Support HMS Profinet Card over Anybus

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Message-ID: <CAK8P3a1zME8G0FjqLaL65F6yYOEuPLJLNs6Mdve7YF=Q2BpU5w@mail.gmail.com>
Date:   Fri, 9 Nov 2018 23:32:50 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     svendev@...x.com, Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH anybus v3 0/6] Support HMS Profinet Card over Anybus

On Fri, Nov 9, 2018 at 10:47 PM Sven Van Asbroeck <thesven73@...il.com> wrote:
>
> On Fri, Nov 9, 2018 at 4:22 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> >
> > As usual, it comes down to the user space interfaces I think. Designing
> > a user interface is hard, most importantly because you cannot change it
> > once anyone starts relying on it, as opposed to implementation details
> > that you are free to change at any point.
>
> Thanks for the feedback !
> I will rework v4 so it uses a userspace interface shared with other
> fieldbus drivers - uio.

You mentioned this before, but I don't see how this would actually
work. Isn't uio just a slim wrapper for allowing user space access
to hardware registers while avoiding a kernel driver?

      Arnd