linux-kernel - Re: [PATCH v3 2/2] ARM64: dts: bcm: Use a symlink to R-Pi dtsi files from arch=arm

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Date:   Sun, 2 Oct 2016 22:57:14 -0700
From:   Olof Johansson <olof@...om.net>
To:     Ian Campbell <ijc@...lion.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, arm@...nel.org,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Eric Anholt <eric@...olt.net>,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>, Gerd Hoffmann <kraxel@...hat.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/2] ARM64: dts: bcm: Use a symlink to R-Pi dtsi files
 from arch=arm

On Thu, Aug 18, 2016 at 11:42:06AM +0100, Ian Campbell wrote:
> The ../../../arm... style cross-references added by commit 9d56c22a7861
> ("ARM: bcm2835: Add devicetree for the Raspberry Pi 3.") do not work in the
> context of the split device-tree repository[0] (where the directory
> structure differs). As with commit 8ee57b8182c4 ("ARM64: dts: vexpress: Use
> a symlink to vexpress-v2m-rs1.dtsi from arch=arm") use symlinks instead.
> 
> [0] https://git.kernel.org/cgit/linux/kernel/git/devicetree/devicetree-rebasing.git/
> 
> Signed-off-by: Ian Campbell <ijc@...lion.org.uk>
> Acked-by: Mark Rutland <mark.rutland@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: Eric Anholt <eric@...olt.net>
> Cc: Stephen Warren <swarren@...dotorg.org>
> Cc: Lee Jones <lee@...nel.org>
> Cc: Gerd Hoffmann <kraxel@...hat.com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-rpi-kernel@...ts.infradead.org
> Cc: arm@...nel.org
> ---
> v2: No more need for skeleton.dtsi since this was cleaned up in the previous
>     patch
> v3: Collected tags

Hi,

I still think this is fundamentally the wrong approach. We shouldn't have
created these file links in the first place.

I'd rather have something like this in our tree:

arch/arm64/boot/dts/include/arm -> ../../../../arm/boot/dts
arch/arm64/boot/dts/include/arm64 -> ../..
arch/arm/boot/dts/include/arm64 -> ../../../../arm64/boot/dts
arch/arm/boot/dts/include/arm -> ../..


That way you can include by using <arm/bcm2835-rpi.dtsi> instead.

You'll populate another (or the same) directory with links as appropriate
in your out-of-tree version of the DT contents.

No more symlinked files, and still a clear way of showing that you're
referencing contents out of the other architecture.

Considerably cleaner, isn't it?


-Olof