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

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Date:   Tue, 24 Jul 2018 22:22:40 +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 <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>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Przemyslaw Gaj <pgaj@...ence.com>
Subject: Re: [PATCH v6 00/10] Add the I3C subsystem


> > My personal use case is debugging. R-Car H2 is great because I can
> > always pinmux this or that I2C IP core to the same set of pins, and in 2
> > out of 4 cases even GPIO bitbang on top of that. So, it is great to
> > compare behaviour, do scopes with the same type of setup, etc...
> > For that, I do runtime switches, but the slaves are not really under
> > real usage.
> 
> Ok, so runtime here still means it's chosen by an operator (i.e. you),
> not part of regular operation.

Yes.

> I meant multiplexing it through the pinmux framework, with one of the
> two being active at any time. Obviously this makes no sense for
> i3c slaves, but it can be useful if the bus only contains i2c slaves.

Unless Linux is not an I2C slave itself.

> What I meant here was switching the bus between an i2c master and an
> i3c master like you do with the i2c demuxer. Right now, this wouldn't
> work because i2c and i3c use different representations in DT and in
> Linux for the same devices.

I see. Thanks for the clarification.


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