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

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Date:   Mon, 18 May 2020 10:43:26 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        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,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-i2c@...r.kernel.org,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support

Hi Wolfram,

On Mon, May 18, 2020 at 10:26 AM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
>
> > > 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 runtime.
> >
> > > 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?
>
Sounds okay to me, how about "renesas,iic-no-dvfs" ? So that this
could be used on all the SoC's which don't support DVFS.

Cheers,
--Prabhakar