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Date:   Mon, 18 May 2020 11:26:01 +0200
From:   Wolfram Sang <wsa+renesas@sang-engineering.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Jens Axboe <axboe@kernel.dk>, Rob Herring <robh+dt@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
        "David S. Miller" <davem@davemloft.net>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        Guenter Roeck <linux@roeck-us.net>, linux-ide@vger.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
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        netdev <netdev@vger.kernel.org>,
        Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
        linux-watchdog@vger.kernel.org
Subject: Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support
Message-ID: <20200518092601.GA3268@ninjato>
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> > However, both versions (with and without automatic transmission) are
> > described with the same "renesas,iic-r8a7742" compatible. Is it possible
> > to detect the reduced variant at runtime somehow?
> >
> I couldn't find anything the manual that would be useful to detect at run=
time.
>=20
> > My concern is that the peculiarity of this SoC might be forgotten if we
> > describe it like this and ever add "automatic transmissions" somewhen.
> >
> Agreed.

Well, I guess reading from a register which is supposed to not be there
on the modified IP core is too hackish.

Leaves us with a seperate compatible entry for it?


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