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From:   Krzysztof Kozlowski <krzk@kernel.org>
Date:   Wed, 10 Jul 2019 12:14:51 +0200
Message-ID: <CAJKOXPc1rOyFujyWk4HwmQb6YEXd=CEHKwN8AH_pKxk-6CA08w@mail.gmail.com>
Subject: Re: [PATCH 0/3] add coupled regulators for Exynos5422/5800
To:     Kamil Konieczny <k.konieczny@partner.samsung.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Kukjin Kim <kgene@kernel.org>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Mark Rutland <mark.rutland@arm.com>,
        MyungJoo Ham <myungjoo.ham@samsung.com>,
        Nishanth Menon <nm@ti.com>, Rob Herring <robh+dt@kernel.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Viresh Kumar <vireshk@kernel.org>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org,
        "linux-samsung-soc@vger.kernel.org" 
        <linux-samsung-soc@vger.kernel.org>
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On Wed, 10 Jul 2019 at 12:03, Kamil Konieczny
<k.konieczny@partner.samsung.com> wrote:
>
> On 10.07.2019 11:00, Krzysztof Kozlowski wrote:
> > On Mon, 8 Jul 2019 at 16:12, <k.konieczny@partner.samsung.com> wrote:
> >>
> >> From: Kamil Konieczny <k.konieczny@partner.samsung.com>
> >>
> >> Hi,
> >>
> >> The main purpose of this patch series is to add coupled regulators for
> >> Exynos5422/5800 to keep constrain on voltage difference between vdd_arm
> >> and vdd_int to be at most 300mV. In exynos-bus instead of using
> >> regulator_set_voltage_tol() with default voltage tolerance it should be
> >> used regulator_set_voltage_triplet() with volatege range, and this is
> >> already present in opp/core.c code, so it can be reused. While at this,
> >> move setting regulators into opp/core.
> >>
> >> This patchset was tested on Odroid XU3.
> >>
> >> The last patch depends on two previous.
> >
> > So you break the ABI... I assume that patchset maintains
> > bisectability. However there is no explanation why ABI break is needed
> > so this does not look good...
>
> Patchset is bisectable, first one is simple and do not depends on others,
> second depends on first, last depends on first and second.
>
> What do you mean by breaking ABI ?

I mean, that Linux kernel stops working with existing DTBs... or am I
mistaken and there is no problem? Maybe I confused the order...

Best regards,
Krzysztof