linux-kernel - Re: [PATCH v5 04/10] dt-bindings: i3c: Document core bindings

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Message-ID: <CAK8P3a2VWLnyforyjroywEwmttEq3eaPov8dGWKVw+GQs-MzcQ@mail.gmail.com>
Date:   Wed, 11 Jul 2018 16:56:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>, 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 v5 04/10] dt-bindings: i3c: Document core bindings

On Wed, Jul 11, 2018 at 4:45 PM, Boris Brezillon
<boris.brezillon@...tlin.com> wrote:
> On Wed, 11 Jul 2018 16:10:10 +0200
> Arnd Bergmann <arnd@...db.de> wrote:
>
>> On Fri, Jun 22, 2018 at 12:49 PM, Boris Brezillon
>> <boris.brezillon@...tlin.com> wrote:
>> > A new I3C subsystem has been added and a generic description has been
>> > created to represent the I3C bus and the devices connected on it.
>> >
>>
>> > +I2C devices
>> > +===========
>> > +
>> > +Each I2C device connected to the bus should be described in a subnode. All
>> > +properties described in Documentation/devicetree/bindings/i2c/i2c.txt are
>> > +valid here, but several new properties have been added.
>> > +
>> > +New constraint on existing properties:
>> > +--------------------------------------
>> ...
>> > +  + third cell: should be 0
>>
>> What for? Just to be future-proof, or do you have something specific
>> in mind here?
>
> Even if I2C devices only need 1 cell, I3C devices need 3 (1 for the
> static address and 2 for the PID). Since both type of devices are
> described under the same bus node, and we can have different
> #address-cells, I had to put 0-padding in the last cell.

Ok, got it.

    Arnd