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

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Message-ID: <91f65527-3440-90fd-4096-5824fba1df78@partner.samsung.com>
Date:   Wed, 10 Jul 2019 12:03:31 +0200
From:   Kamil Konieczny <k.konieczny@...tner.samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
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 10.07.2019 11:00, Krzysztof Kozlowski wrote:
> 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...

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 ?

> 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

-- 
Best regards,
Kamil Konieczny
Samsung R&D Institute Poland