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

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Message-ID: <20181115190824.GJ2089@sirena.org.uk>
Date:   Thu, 15 Nov 2018 11:08:24 -0800
From:   Mark Brown <broonie@...nel.org>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     vitor <vitor.soares@...opsys.com>,
        Wolfram Sang <wsa@...-dreams.de>, 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>
Subject: Re: [PATCH v10 0/9] Add the I3C subsystem

On Thu, Nov 15, 2018 at 01:57:31PM +0100, Boris Brezillon wrote:

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

Yes, this is much safer and more robust especially if the bus has
enumeration requirements like you're saying it does.  It's much easier
and more sensible to do this if the bus can be enumerated than it is
with SPI, USB would be a good example here I guess (though I've never
looked at the details of how USB does this on the implementation side 
so this may be me speaking in blissful ignorance).

I do agree that there will be use cases that turn up for this.

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