linux-kernel - Re: [PATCH v10 0/9] Add the I3C subsystem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 15 Nov 2018 16:01:37 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     vitor <vitor.soares@...opsys.com>, linux-i2c@...r.kernel.org,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        linux-gpio@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
        Przemyslaw Gaj <pgaj@...ence.com>,
        Peter Rosin <peda@...ntia.se>,
        Mike Shettel <mshettel@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v10 0/9] Add the I3C subsystem

Hi Boris,

> What we could do though, is expose I3C devices that do not have a
> driver in kernel space, like spidev does.

...

> Mark, Wolfram, Arnd, Greg, any opinion?

Is there a benefit for having drivers in userspace? My gut feeling is to
encourage people to write kernel drivers. If this is, for some reason,
not possible for some driver, then we have a use case at hand to test
the then-to-be-developed userspace interface against. Until then, I
personally wouldn't waste effort on designing it without a user in
sight.

Dunno if you have that, but a debug interface (exchanging data with
clients) on the other hand would be super useful most probably. Maybe
you can start having that in debugfs and already learn from it if you
ever want to move some interface outside of debugfs?

Kind regards,

   Wolfram


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)