linux-kernel - Re: [PATCH 1/2] ARM: dts: qcom: ipq8064: reorganize node order and sort them

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Date:   Tue, 19 Jul 2022 10:57:22 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: dts: qcom: ipq8064: reorganize node order and
 sort them

On Tue, Jul 19, 2022 at 12:56:18PM +0200, Krzysztof Kozlowski wrote:
> On 19/07/2022 10:19, Christian Marangi wrote:
> > On Tue, Jul 19, 2022 at 12:22:24PM +0200, Konrad Dybcio wrote:
> >>
> >>
> >> On 19.07.2022 12:16, Krzysztof Kozlowski wrote:
> >>> On 19/07/2022 11:59, Dmitry Baryshkov wrote:
> >>>> On Tue, 19 Jul 2022 at 12:56, Krzysztof Kozlowski
> >>>> <krzysztof.kozlowski@...aro.org> wrote:
> >>>>>
> >>>>> On 18/07/2022 17:38, Christian Marangi wrote:
> >>>>>> Reorganize node order and sort them by address.
> >>>>>>
> >>>>>> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> >>>>>> ---
> >>>>>>
> >>>>>> This was picked from for-next qcom branch [1]. Reorganize dtsi as requested.
> >>>>>>
> >>>>>> [1] https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/?h=for-next
> >>>>>
> >>>>> If this is picked by qcom branch, no need to resend it.
> >>>>>
> >>>>> I don't see value in such reshuffle. Reviewing is not possible and you
> >>>>> did not mention tests (results should be equal).
> >>>>
> >>>> The value is usual for all the cleanups: make it follow the
> >>>> established practice.
> >>>
> >>> Are you sure this is established practice?
> >> Yes.
> >>
> >>  New DTSI files (see SC8280XP,
> >>> sm8450 although sc7280 looked ordered) do not always follow it, so why
> >>> imposing it for existing code?
> >> Perhaps it slipped through review.. Partially my bad.
> >>
> >>
> >> Such reshuffle can cause conflicts thus
> >>> stops parallel development. Review is close to impossible...
> >> Almost any addition or removal also causes conflicts, because git is
> >> not as smart as we would like it to be. If the commit is structured
> >> properly (i.e. it *only* changes the order and nothing else),
> >> decompiling the dtbs before and after applying it and using a tool
> >> like meld that can find similar chunks of text at different offsets
> >> review is definitely possible, though not very pleasant (you can't
> >> just diff them, as order is preserved & phandles change due to that)
> >> as you have to look at it manually and can't tell much by just taking
> >> a look at the email.
> >>
> > 
> > Can you give me an example of such tool? So I can put these data in the
> > commit description. I have to rebase this anyway as more changes got
> > merged so it might be a good idea to add more info about how this won't
> > make actualy changes.
> > 
> 
> scripts/dtc/dtx_diff
> fdtdump + diff
> 
> There should be an empty diff from at least one of methods above. If you
> have a difference, I am not sure how can we verify this.
> 
> 
> Best regards,
> Krzysztof

This [1] is the output of dtx_diff.
The file diff is just phanle change that are related to the node order.

Seems a nice way to verify if the shuffle didn't drop any node.

[1] https://gist.github.com/Ansuel/5ea821af51b8126292f4b3cd57e18555

-- 
	Ansuel