linux-kernel - Re: [RFC 2/5] i3c: Add core I3C infrastructure

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Message-ID: <20170801150108.GC1450@katana>
Date:   Tue, 1 Aug 2017 17:01:08 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-i2c@...r.kernel.org,
        Jonathan Corbet <corbet@....net>, 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>,
        Jan Kotas <jank@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.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 Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/5] i3c: Add core I3C infrastructure


> I do not know of any real devices as of today (all my tests have been
> done with a dummy/fake I3C slaves emulated with a slave IP),

I see.

> spec clearly describe what legacy/static addresses are for and one of
> their use case is to connect an I3C device on an I2C bus and let it act
> as an I2C device.

OK. That makes it more likely.

> Unless you want your device (likely a sensor) to be compatible with both
> I3C and I2C so that you can target even more people.

Right. My question was if this is a realistic or more academic scenario.

> I'm perfectly fine with the I3C / I2C framework separation. The only
> minor problem I had with that was the inaccuracy of the
> sysfs/device-model representation: we don't have one i2c and one i3c
> bus, we just have one i3c bus with a mix of i2c and i3c devices.

I understand that. What if I2C had the same seperation between the "bus"
and the "master"?


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