netdev - Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support

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Message-ID: <20200515171031.GB19423@ninjato>
Date:   Fri, 15 May 2020 19:10:31 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Jens Axboe <axboe@...nel.dk>, Rob Herring <robh+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        "David S. Miller" <davem@...emloft.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-ide@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-mmc@...r.kernel.org,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support

On Fri, May 15, 2020 at 04:08:43PM +0100, Lad Prabhakar wrote:
> Add the I2C[0-3] and IIC[0-3] devices nodes to the R8A7742 device tree.
> 
> Automatic transmission for PMIC control is not available on IIC3 hence
> compatible string "renesas,rcar-gen2-iic" and "renesas,rmobile-iic" is
> not added to iic3 node.

Makes sense.

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?

My concern is that the peculiarity of this SoC might be forgotten if we
describe it like this and ever add "automatic transmissions" somewhen.


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