linux-kernel - Re: [PATCH anybus v2 1/5] misc: support the Arcx anybus bridge.

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Date:   Thu, 1 Nov 2018 22:53:46 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, svendev@...x.com,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andreas Färber <afaerber@...e.de>,
        Thierry Reding <treding@...dia.com>,
        David Lechner <david@...hnology.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Johan Hovold <johan@...nel.org>,
        Michal Simek <monstr@...str.eu>, michal.vokac@...ft.com,
        Greg KH <gregkh@...uxfoundation.org>, john.garry@...wei.com,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Robin Murphy <robin.murphy@....com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Stuart Yoder <stuyoder@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH anybus v2 1/5] misc: support the Arcx anybus bridge.

On Thu, Nov 1, 2018 at 6:17 PM Sven Van Asbroeck <thesven73@...il.com> wrote:

> >> +static DEVICE_ATTR_RO(version);
> >
> > Do you need this in userspace really?
> >
> >> +static DEVICE_ATTR_RO(design_number);
> >
> > And this?
>
> Unfortunately, I do :(
> The application software reads these out and displays them in an UI. It's
> important to be able to see these on a running device.

OK...

> Perhaps there is another kernel abstraction I could use?

I don't think so. If you want to be pedantic, document the sysfs
files in Documentation/ABI/testing/sysfs-*

Maybe the properties should be on the bus though? I don't know :/

Yours,
Linus Walleij