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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
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