linux-kernel - Re: [PATCH] devicetree: Move include prefixes from arch to separate directory

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Date:   Sat, 13 May 2017 18:18:23 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Olof Johansson <olof@...om.net>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mikael Starvik <starvik@...s.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        James Hogan <james.hogan@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frank Rowand <frowand.list@...il.com>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] devicetree: Move include prefixes from arch to separate directory

Hi Olof,

Am Freitag, 12. Mai 2017, 20:34:31 CEST schrieb Olof Johansson:
> We use a directory under arch/$ARCH/boot/dts as an include path
> that has links outside of the subtree to find dt-bindings from under
> include/dt-bindings. That's been working well, but new DT architectures
> haven't been adding them by default.
> 
> Recently there's been a desire to share some of the DT material between
> arm and arm64, which originally caused developers to create symlinks or
> relative includes between the subtrees. This isn't ideal -- it breaks
> if the DT files aren't stored in the exact same hierarchy as the kernel
> tree, and generally it's just icky.
> 
> As a somewhat cleaner solution we decided to add a $ARCH/ prefix link
> once, and allow DTS files to reference dtsi (and dts) files in other
> architectures that way.
> 
> Original approach was to create these links under each architecture,
> but it lead to the problem of recursive symlinks.
> 
> As a remedy, move the include link directories out of the architecture
> trees into a common location. At the same time, they can now share one
> directory and one dt-bindings/ link as well.
> 
> Fixes: 4027494ae6e3 ('ARM: dts: add arm/arm64 include symlinks')
> Reported-by: Russell King <linux@...linux.org.uk>
> Reported-by: Omar Sandoval <osandov@...ndov.com>
> Cc: Heiko Stuebner <heiko@...ech.de>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Mikael Starvik <starvik@...s.com>
> Cc: Jesper Nilsson <jesper.nilsson@...s.com>
> Cc: James Hogan <james.hogan@...tec.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: linux-arch <linux-arch@...r.kernel.org>
> Signed-off-by: Olof Johansson <olof@...om.net>

change itself looks good to me and also works, so

Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Tested-by: Heiko Stuebner <heiko@...ech.de>

But we also have an overlooked glitch in the new rk3399-gru devicetrees
that surfaces with this patch applied.

../arch/arm64/boot/dts/rockchip/rk3399-gru-kevin.dts:47:57: fatal error: include/dt-bindings/input/linux-event-codes.h: File or directory not found
 #include <include/dt-bindings/input/linux-event-codes.h>

so need the patch from Ian Campbell 
"arm64: dts: rockchip: Drop explicit "include/" prefix from #include" [0]
in front to not cause other build breakage.

So if applicable, both patches should go in together, with the gru patch
in front and I've added my Reviewed-by there if someone else is doing it.


Heiko

[0] https://www.spinics.net/lists/arm-kernel/msg580835.html