linux-kernel - [PATCH] ARM64: dts: vexpress: Use a symlink to vexpress-v2m-rs1.dtsi from arch=arm

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Date:	Mon, 5 Oct 2015 12:53:52 +0100
From:	Ian Campbell <ian.campbell@...rix.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Ian Campbell <ian.campbell@...rix.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Kumar Gala" <galak@...eaurora.org>,
	Liviu Dudau <liviu.dudau@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Kristina Martsenko" <kristina.martsenko@....com>,
	Kevin Hilman <khilman@...aro.org>,
	Frank Rowand <frank.rowand@...ymobile.com>,
	Olof Johansson <olof@...om.net>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <arm@...nel.org>,
	<linux-kbuild@...r.kernel.org>
Subject: [PATCH] ARM64: dts: vexpress: Use a symlink to vexpress-v2m-rs1.dtsi from arch=arm

Commit 9ccd608070b6 "arm64: dts: add device tree for ARM SMM-A53x2 on
LogicTile Express 20MG" added a new dts file to arch/arm64 which
included "../../../../arm/boot/dts/vexpress-v2m-rs1.dtsi", i.e. a
.dtsi supplied by arch/arm.

Unfortunately this causes some issues for the split device tree
repository[0], since things get moved around there. In that context
the new .dts ends up at src/arm64/arm/vexpress-v2f-1xv7-ca53x2.dts
while the include is at src/arm/vexpress-v2m-rs1.dtsi.

The sharing of the .dtsi is legitimate since the baseboard is the same
for various vexpress systems whatever processor they use.

Previously I attempted to resolve this by creating a shared location
for such things but we have been unable to come to a consensus on
where that should be.

Instead this patch simply replaces the use of ../../ in the dts
/include/ with a symlink in arch/arm64/boot/dts/arm pointing to the
file arch/arm/boot/dts.

Since the split device tree repo will shortly be required to flatten
symlinks for other reasons this will cause the dtsi file to appear in
both src/arm and src/arm64 in the split repo, which is an improvement
on not building for arm64 now.

[0] https://git.kernel.org/cgit/linux/kernel/git/devicetree/devicetree-rebasing.git/

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Pawel Moll <pawel.moll@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Kumar Gala <galak@...eaurora.org>
Cc: Liviu Dudau <liviu.dudau@....com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Kristina Martsenko <kristina.martsenko@....com>
Cc: Kevin Hilman <khilman@...aro.org>
Cc: Frank Rowand <frank.rowand@...ymobile.com>
Cc: Olof Johansson <olof@...om.net>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: arm@...nel.org
Cc: linux-kbuild@...r.kernel.org
---
For more on flattening symlinks see
http://thread.gmane.org/gmane.linux.kernel.input/45646/focus=45742
---
 arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts | 2 +-
 arch/arm64/boot/dts/arm/vexpress-v2m-rs1.dtsi        | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 120000 arch/arm64/boot/dts/arm/vexpress-v2m-rs1.dtsi

diff --git a/arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts b/arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts
index 5b1d018..bb3c26d 100644
--- a/arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts
+++ b/arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts
@@ -186,6 +186,6 @@
 				<0 0 41 &gic GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>,
 				<0 0 42 &gic GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
 
-		/include/ "../../../../arm/boot/dts/vexpress-v2m-rs1.dtsi"
+		/include/ "vexpress-v2m-rs1.dtsi"
 	};
 };
diff --git a/arch/arm64/boot/dts/arm/vexpress-v2m-rs1.dtsi b/arch/arm64/boot/dts/arm/vexpress-v2m-rs1.dtsi
new file mode 120000
index 0000000..68fd0f8
--- /dev/null
+++ b/arch/arm64/boot/dts/arm/vexpress-v2m-rs1.dtsi
@@ -0,0 +1 @@
+../../../../arm/boot/dts/vexpress-v2m-rs1.dtsi
\ No newline at end of file
-- 
2.5.3

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