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

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Date:   Thu, 15 Nov 2018 20:07:39 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     vitor <vitor.soares@...opsys.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Wolfram Sang <wsa@...-dreams.de>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        gregkh <gregkh@...uxfoundation.org>,
        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>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        "open list:GPIO SUBSYSTEM" <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

On Thu, 15 Nov 2018 15:25:11 +0000
vitor <vitor.soares@...opsys.com> wrote:

> Hi Arnd,
> 
> On 15/11/18 14:25, Arnd Bergmann wrote:
> > I agree about better not exposing the bus as a /dev/i3c* node, and that we
> > probably do need to expose individual devices in some form to allow
> > writing complete user space drivers that can do everything a kernel driver
> > can do.
> >
> > Can you describe what a low-level interface to the device looks like
> > in the kernel? Can this be abstracted as simply pread()/pwrite() plus
> > an interrupt mechanism, or do we need a set of ioctl() operations as
> > well?  
> 
> Like in i2c is likely to need the ioctl() too.

Yep, I think we'll need an ioctl given the various type of transfers
one case use to interact with a device.