linux-kernel - Re: [PATCH 0/3] add coupled regulators for Exynos5422/5800

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Message-ID: <CAJKOXPd+UZ2MdrTVfBv5UYzK5LgKNQHUFzRbRNeq271EaDSchg@mail.gmail.com>
Date:   Wed, 10 Jul 2019 11:00:53 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     k.konieczny@...tner.samsung.com
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH 0/3] add coupled regulators for Exynos5422/5800

On Mon, 8 Jul 2019 at 16:12, <k.konieczny@...tner.samsung.com> wrote:
>
> From: Kamil Konieczny <k.konieczny@...tner.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...

Best regards,
Krzysztof

>
> Regards,
> Kamil
>
> Kamil Konieczny (2):
>   opp: core: add regulators enable and disable
>   devfreq: exynos-bus: convert to use dev_pm_opp_set_rate()
>
> Marek Szyprowski (1):
>   ARM: dts: exynos: add initial data for coupled regulators for
>     Exynos5422/5800
>
>  arch/arm/boot/dts/exynos5420.dtsi             |  34 ++--
>  arch/arm/boot/dts/exynos5422-odroid-core.dtsi |   4 +
>  arch/arm/boot/dts/exynos5800-peach-pi.dts     |   4 +
>  arch/arm/boot/dts/exynos5800.dtsi             |  32 ++--
>  drivers/devfreq/exynos-bus.c                  | 172 +++++++-----------
>  drivers/opp/core.c                            |  13 ++
>  6 files changed, 120 insertions(+), 139 deletions(-)
>
> --
> 2.22.0
>