From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id DEFF5ECAAD1
	for <linux-kernel@archiver.kernel.org>; Wed, 31 Aug 2022 13:32:45 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S229992AbiHaNcn (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Wed, 31 Aug 2022 09:32:43 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42852 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S231232AbiHaNck (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 31 Aug 2022 09:32:40 -0400
Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [IPv6:2a00:1450:4864:20::52b])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A14C9D21E8
        for <linux-kernel@vger.kernel.org>; Wed, 31 Aug 2022 06:32:38 -0700 (PDT)
Received: by mail-ed1-x52b.google.com with SMTP id c59so12196605edf.10
        for <linux-kernel@vger.kernel.org>; Wed, 31 Aug 2022 06:32:38 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=linaro.org; s=google;
        h=cc:to:subject:message-id:date:from:in-reply-to:references
         :mime-version:from:to:cc;
        bh=CgFPDK2LvRhAS6goxi4X/Ic8NNdHal1iYUOcFxcfEdk=;
        b=OihL0qcd7WTm78kvrrTsnVuXk1//E+pKPWsyjcGbB/P4HjEZXfREd/CjogrV6SDOlL
         GsHoAFIvYgnKbfcx6ccWiSl/xuBdQG3P5vgPFA8wCFCPYFhzTVSvCx3jIWFOrPt68oMR
         qUwnav9c//Odlu5krHpyk+sUs7gdRgOWz0XpnFbonZzefWiC4MhVBSZ3S2qO0xugA1Ov
         AYmMZUOVp+svGZPETa8oThZlCTa0q8zfwEfoUmRrznv3BP2HFAI0R6ZJICBLg/fmdhkh
         BaKfz/hMLg5YOV9680dDdCjKdeV3uupWudbX/ipOad25UYmOrgCvX6SUubv1SUxPTtZN
         rsOQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20210112;
        h=cc:to:subject:message-id:date:from:in-reply-to:references
         :mime-version:x-gm-message-state:from:to:cc;
        bh=CgFPDK2LvRhAS6goxi4X/Ic8NNdHal1iYUOcFxcfEdk=;
        b=jbvau9+efM0T5KPEHimweOfMmVnYq9NwQhL3QIxFd+V68HMloxsvwBaUuh34au8mn3
         KnFtOmkFSeDa2cGMGv/jHNDlFlxwu6Yv093ml5QiGaIxPB9Tsyreos7cynfVg1sHbU25
         HAEWsgEBBmqTaA8TCdKaURGXX7zUD8WqvRXFYkt/YqPHogVtzyjGSoIEXTToJhXvL3M4
         BGBAyjt9aOk2KeDc8rL/2a+UdRDbhuLsWYXkbsVD0mNCDVfrEHAU6X79Ft/cbdnAU4xs
         wUz4njZ0HTycrySpSqk9wbVuHo+zL1ZVOi6m6W0GHB7GLkG8WRwHlmz6+9RMW9mujxUa
         es8Q==
X-Gm-Message-State: ACgBeo18uNCyAUabX7v00DPFItmzG4vRyg/BjSH4E67v2onJ0Ze0lYxa
        tyYai0ptns5WqwImHU5yRSGwxxj+rNN3WATQQ7vqog==
X-Google-Smtp-Source: AA6agR4gJIbhP+4ApJR2yhAwf3e1Odkz7EHU+179Wq7SwkPr/9kSVAUOmgosnJMFlpXFsd/QDaxBnLupLFuZc97eYn0=
X-Received: by 2002:a05:6402:2691:b0:43d:ba10:854b with SMTP id
 w17-20020a056402269100b0043dba10854bmr23759195edd.158.1661952757218; Wed, 31
 Aug 2022 06:32:37 -0700 (PDT)
MIME-Version: 1.0
References: <CAK8P3a0j-54_OkXC7x3NSNaHhwJ+9umNgbpsrPxUB4dwewK63A@mail.gmail.com>
 <CACRpkda0+iy8H0YmyowSDn8RbYgnVbC1k+o5F67inXg4Qb934Q@mail.gmail.com>
 <CAK8P3a0uuJ_z8wmNmQTW_qPNqzz7XoxZdHgqbzmK+ydtjraeHg@mail.gmail.com>
 <CACRpkdb5ow4hD3td6agCuKWvuxptm5AV4rsCrcxNStNdXnBzrA@mail.gmail.com>
 <87f2ff4c-3426-201c-df86-2d06d3587a20@csgroup.eu> <CACRpkdYizQhiJXzXNHg7TXUVHzhkwXHFN5+e58kH4udGm1ziEA@mail.gmail.com>
 <f76dbc49-526f-6dc7-2ef1-558baea5848b@csgroup.eu> <CACRpkdZpwdP+1VitohznqRfhFGcLT2f+sQnmsRWwMBB3bobwAw@mail.gmail.com>
 <515364a9-33a1-fafa-fdce-dc7dbd5bb7fb@csgroup.eu> <CAK8P3a36qbRW8hd+1Uhi88kh+-KTjDMT-Zr8Jq9h_G3zQLfzgw@mail.gmail.com>
 <Yw3DKCuDoPkCaqxE@arcana.i.gnudd.com>
In-Reply-To: <Yw3DKCuDoPkCaqxE@arcana.i.gnudd.com>
From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Wed, 31 Aug 2022 15:32:25 +0200
Message-ID: <CACRpkdZeAAZYqV3ccd-X=ZwdnfSwRUdXchGETB-WTkgSZQL=Pw@mail.gmail.com>
Subject: Re: [PATCH] gpio: Allow user to customise maximum number of GPIOs
To:     Davide Ciminaghi <ciminaghi@gnudd.com>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Alexandre Courbot <gnurou@gmail.com>,
        Alexandre Courbot <acourbot@nvidia.com>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Jonathan Corbet <corbet@lwn.net>,
        Russell King <linux@armlinux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@vger.kernel.org>, Alessandro Rubini <rubini@gnudd.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Aug 30, 2022 at 9:58 AM Davide Ciminaghi <ciminaghi@gnudd.com> wrote:

> the sta2x11 was a chip containing AMBA peripherals and a PCIe to AMBA bridge
> (it is still in production as far as I know, but deprecated for new designs).
> It would typically be installed on x86 machines, so you needed to build and
> run AMBA drivers in an x86 environment. The original drivers we started from
> had platform data, but then we were told to switch to DTS.

For the record I think that was bad advice, I hope it wasn't me.
But the world was different back then I suppose.
Adding DTS to x86 which is inherently ACPI is not a good idea.
Especially if you look at how SBSA ACPI UARTS were done
in drivers/tty/serial/amba-pl011.c.

Today I think we would solve this by simply creating software nodes, which
are the same no matter if you're doing device tree or ACPI, so it would
have been much easier now, I think. :/

Yours,
Linus Walleij