linux-kernel - Re: [PATCH 3/4] arm64: dts: exynos: make tm2 and tm2e independent from each other

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Date:   Tue, 3 Jan 2017 18:41:16 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Andi Shyti <andi.shyti@...sung.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Jaechul Lee <jcsing.lee@...sung.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>, beomho.seo@...sung.com,
        galaxyra@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 3/4] arm64: dts: exynos: make tm2 and tm2e independent
 from each other

On Tue, Jan 03, 2017 at 07:25:48PM +0900, Andi Shyti wrote:
> > >> > Currently tm2e dts includes tm2 but there are some differences
> > >> > between the two boards and tm2 has some properties that tm2e
> > >> > doesn't have.
> > >> >
> > >> > That's why it's important to keep the two dts files independent
> > >> > and put all the commonalities in a tm2-common.dtsi file.
> > >> >
> > >> > Signed-off-by: Andi Shyti <andi.shyti@...sung.com>
> > >> > Signed-off-by: Jaechul Lee <jcsing.lee@...sung.com>
> > >> > ---
> > >> >  .../boot/dts/exynos/exynos5433-tm2-common.dtsi     | 1046 ++++++++++++++++++++
> > >> >  arch/arm64/boot/dts/exynos/exynos5433-tm2.dts      | 1033 +------------------
> > >> >  arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts     |    2 +-
> > >> >  3 files changed, 1049 insertions(+), 1032 deletions(-)
> > >> >  create mode 100644 arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
> > >>
> > >> I would like to see here the rename and diff from it. Not entire delta
> > >> (deletions and addons). It is not possible to compare it... I think
> > >> git supports it by default with similarity of 50%.
> > >
> > > I understand, it's indeed quite cryptic to understand. But all
> > > the diff algorithms (patience, minimal, histogram, myers) give
> > > the same result. I don't know how to make it better.
> > >
> > > I could split this patch, but this also means breaking tm2's
> > > functionality, which looks worse.
> > >
> > > Please tell me if you know a better way for generating the patch.
> > 
> > git format-patch -M95%?
> 
> Same thing with all M values.
> 
> Because exynos5433-tm2.dts results modified, while
> exynos5433-tm2-common.dtsi is new. Even though I did:
> 
> 1. mv exynos5433-tm2.dts exynos5433-tm2-common.dtsi
> 2. copied pieces from exynos5433-tm2-common.dtsi to a new
>    exynos5433-tm2.dts

mv/etc won't help. You need to convince git format-patch that it is
rename. For that, you need -B so copy will be considered a rename
(otherwise rename will be detected only if a file is removed), so:
	git format-patch -B50% -1

Please resend with this approach.

Best regards,
Krzysztof