linux-kernel - Re: [PATCH v6 00/10] Add the I3C subsystem

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Message-ID: <20180720110549.zgre7f7x7jkrbyt7@ninjato>
Date:   Fri, 20 Jul 2018 13:05:49 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Peter Rosin <peda@...ntia.se>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        linux-i2c@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Greg Kroah-Hartman <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>,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        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>
Subject: Re: [PATCH v6 00/10] Add the I3C subsystem


> * What I understand from reading i2c-demux-pinctrl.c, a slave device
>   will only ever be observable from one master at a time, when you
>   switch over, all children get removed on one master and added to
>   the other one, to be probed again by their respective drivers.

Yes. The very first versions of the demuxer tried to do it in a
hot-swapping like fashion but then I switched over because of...

> it definitely opens up questions in what happens to e.g. the sysfs
> representation, lock order, and power management that I'd rather
> not have to think about.

... this! There are dragons, I can tell you :)

> * The other thing we definitely have to support for i3c is to deal with
>    handing over control of the bus between the i3c master owned
>    by Linux, and other masters that are /not/ owned by the same
>    Linux instance. This is the part that the spec discusses in much
>    detail, with the intention of temporarily giving up control of the
>    bus to let another master do its thing on a shared slave without
>    user interaction.

I can't comment about this one.


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