From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C3CAC433E0 for ; Mon, 18 May 2020 09:43:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 750192067D for ; Mon, 18 May 2020 09:43:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JqgjwmBP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726358AbgERJnx (ORCPT ); Mon, 18 May 2020 05:43:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726130AbgERJnw (ORCPT ); Mon, 18 May 2020 05:43:52 -0400 Received: from mail-oi1-x244.google.com (mail-oi1-x244.google.com [IPv6:2607:f8b0:4864:20::244]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B48A7C061A0C; Mon, 18 May 2020 02:43:52 -0700 (PDT) Received: by mail-oi1-x244.google.com with SMTP id x23so1869341oic.3; Mon, 18 May 2020 02:43:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=/VHy1hHOeueJvHWA+mIj7Qzx/f1KRkhXRlYmq2aNs+s=; b=JqgjwmBPXoMBDRhMe/zLRO+0nqJpZo3xtehDSPILE43EMVp7vI1ltfmdts5s0KtCRf uIBgtiMhyn/xhEM1Id+681LLJSD/Qj5nLdHpUxWXsbb7BOa3H+n6xY/DSomN53kEeQub 2m1BwrNVkjIv1TGT49CZlr9mhKPXYG3uK/ZMHmxwbPkZ8Rjwectk1gAHCV7CzzzaCkeR gnYSbO8hAulsKvOwAb/5h8C1+Uqji79SPswiZelTUH9Pyz3CDYs1mmuV83v0fcyvwFXS axdNbFME8NdzKR7KcRXjqDXEevkA/rrYfd3uFaW9m/S04Vw50TCElWMXIAIJ95KXr57o IOvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=/VHy1hHOeueJvHWA+mIj7Qzx/f1KRkhXRlYmq2aNs+s=; b=IWlXMULj8oD2pE1mrCYA9u8giZ+PIAZERFA64+XrE6EOM5+BoMphDwAYP1C1V1Atw7 uFbXEziiQJuOz/d4SFvtd14jD76A0hIbG1tOy+S4fPXtgmwczRiQacOUk09FgDJeTmyl IolzDXPMuAScxIsm78a82Q6kEzg+frfGhLhZRXFJXMxv0uG+ldQWpEvcEjw9i+UKdAuJ 51SfgFN6iYW/82HSZIkfXdvbOhBJcas+Ry4QPFv/DziJhh0r8unyupNiVxMeDXPMh3Np ZSA5dCP3CSXS3VbLxUNBsp8IoMbtHTZnWm8jPvof+hHISy3v7zmfDl8N/XiM5m5mXzu0 s6DQ== X-Gm-Message-State: AOAM5315Z1yJmoHZnOU8Ud6MSjajjvj6xVxGMksMNdqdFj5uNSGT9OcG 796ssuNFsCMUuAchBOozrG2zl5cbzHLsehK9Hlo= X-Google-Smtp-Source: ABdhPJyZokWBShBDnXM+nIl04b5W7Or37VItdZLPs5gY9c4zj0/Ms7gEb4Fyihg95NVJWH0uI4VMBKsajlBWzNrAoDg= X-Received: by 2002:aca:d68f:: with SMTP id n137mr8141794oig.62.1589795032149; Mon, 18 May 2020 02:43:52 -0700 (PDT) MIME-Version: 1.0 References: <1589555337-5498-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> <1589555337-5498-4-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> <20200515171031.GB19423@ninjato> <20200518092601.GA3268@ninjato> In-Reply-To: <20200518092601.GA3268@ninjato> From: "Lad, Prabhakar" Date: Mon, 18 May 2020 10:43:26 +0100 Message-ID: Subject: Re: [PATCH 03/17] ARM: dts: r8a7742: Add I2C and IIC support To: Wolfram Sang , Geert Uytterhoeven Cc: Lad Prabhakar , Jens Axboe , Rob Herring , Ulf Hansson , Sergei Shtylyov , "David S. Miller" , Wim Van Sebroeck , Guenter Roeck , linux-ide@vger.kernel.org, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , LKML , linux-i2c@vger.kernel.org, Linux MMC List , netdev , Linux-Renesas , linux-watchdog@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-ide-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org Hi Wolfram, On Mon, May 18, 2020 at 10:26 AM Wolfram Sang 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