linux-kernel - Re: [PATCH v1 4/5] staging: fieldbus core: add support for FL-NET devices

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Message-ID: <CAGngYiWu=LVr06YSZ4WuN+QCfz4k2JJmqOYQ=sZWSUEu+gJq5Q@mail.gmail.com>
Date:   Wed, 2 Oct 2019 11:08:08 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Andreas Färber <afaerber@...e.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Enrico Weigelt <lkml@...ux.net>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "J. Kiszka" <jan.kiszka@...mens.com>,
        Frank Iwanitz <friw@...-networks.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v1 4/5] staging: fieldbus core: add support for FL-NET devices

On Mon, Sep 30, 2019 at 10:09 AM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Wed, Sep 18, 2019 at 02:35:51PM -0400, Sven Van Asbroeck wrote:
> > Add the FL-NET device type to the fieldbus core.
>
> What does this mean?
>
> You add an unspecified enumerated type and suddenly new hardware starts
> working?  That feels really wrong to me...
>

This just empowers fieldbus devices to id themselves as 'flnet' when they
register with the core:

priv->fbdev.fieldbus_type = FIELDBUS_DEV_TYPE_FLNET;
...
err = fieldbus_dev_register(&priv->fbdev);

The core exports this as a sysfs property, so that userspace has a
standardized way of determining the fieldbus type when looking at the
fieldbus dev's sysfs dir.

Yes the commit message is too confusing. I'll write a better one if/when I
repost flnet support. Might be a while because you indicated "no new h/w
support while still in staging".