linux-kernel - Re: [PATCH v5 1/6] fieldbus_dev: add Fieldbus Device subsystem.

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Date:   Wed, 5 Dec 2018 20:17:24 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Sven Van Asbroeck <svendev@...x.com>, 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>, john.garry@...wei.com,
        geert+renesas@...der.be, robin.murphy@....com,
        paul.gortmaker@...driver.com,
        sebastien.bourdelin@...oirfairelinux.com, icenowy@...c.io,
        Stuart Yoder <stuyoder@...il.com>, maxime.ripard@...tlin.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 1/6] fieldbus_dev: add Fieldbus Device subsystem.

On Wed, Dec 05, 2018 at 10:39:56AM -0500, Sven Van Asbroeck wrote:
> Hello Greg, thanks for the feedback!
> 
> On Wed, Dec 5, 2018 at 5:17 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> > And why is this a class and not just a "normal" device and bus?  Devices
> > live on busses, not generally as a class.  Can your devices live on
> > different types of busses (USB, PCI, etc.)?
> 
> This patchset can be a bit confusing, because it doesn't just add support for a
> single fieldbus device - it proposes a general fieldbus subsystem.

Great, then call it a 'fieldbus' class, not "fieldbus_dev' class.

Devices can belong to a bus, or a class, so you are fine here.

> Fieldbus devices from different vendors can sit on the usb, i2c, pci, etc.
> buse, but they all register as a fieldbus device, via fieldbus_dev_register(),
> and show up as a fieldbus class member.

ok, I'm just complaining about your name in sysfs, not your code :)

I think what you did here is correct from a logic point of view.

> Userspace can then enumerate all fieldbus devices connected to the system by
> looking at the class. Without having to know which bus they happen to be
> connected to.

Sounds reasonable.

nice work,

greg k-h