linux-kernel - [PATCH] ARM: dts: TI: Enable __symbols_

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Date:   Wed, 16 Aug 2017 17:59:11 -0400
From:   Tom Rini <trini@...sulko.com>
To:     devicetree@...r.kernel.org
Cc:     Tero Kristo <t-kristo@...com>, Nishanth Menon <nm@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Sekhar Nori <nsekhar@...com>,
        Jason Kridner <jkridner@...gleboard.org>,
        Drew Fustini <drew@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: TI: Enable __symbols__ in dtb files for some platforms

Build the dtb file for these platfroms with __symbol__ information
included.  This will reduce the size of the dtb (and resident memory
usage) in exchange for allowing more types of overlays to be applied to
the dtb file prior to passing it to Linux and additional functionality
within the kernel when OF_OVERLAY is enabled.

Cc: Jason Kridner <jkridner@...gleboard.org>
Cc: Drew Fustini <drew@...gleboard.org>
Cc: Robert Nelson <robertcnelson@...il.com>
Cc: Lokesh Vutla <lokeshvutla@...com>
Cc: Frank Rowand <frowand.list@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Russell King <linux@...linux.org.uk>
Cc: devicetree@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tom Rini <trini@...sulko.com>
---
This patch takes the path that Rob encouraged in my previous patch of
enabling __symbols__ in some platforms now (that can use it) and see if
a critical mass evolves that pushes towards -@ being default for all
dtbs.  I would suggest that the dra76 series be respun to include a hunk
like this at least as well, and if there's another Beagle X15 patch,
that too.  Russell, per some of our conversations, something like would
also be needed as part of using overlays to solve some of the problems
with Hummingboard, etc.
---
 arch/arm/boot/dts/Makefile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 4b17f35dc9a7..6f98422ca00e 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -1063,3 +1063,17 @@ dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dts
 
 always		:= $(dtb-y)
 clean-files	:= *.dtb
+
+# enable creation of __symbols__ node
+DTC_FLAGS_am335x-bone += -@
+DTC_FLAGS_am335x-boneblack += -@
+DTC_FLAGS_am335x-boneblack-wireless += -@
+DTC_FLAGS_am335x-boneblue += -@
+DTC_FLAGS_am335x-bonegreen += -@
+DTC_FLAGS_am335x-bonegreen-wireless += -@
+DTC_FLAGS_am57xx-beagle-x15 += -@
+DTC_FLAGS_am57xx-beagle-x15-revb1 += -@
+DTC_FLAGS_dra7-evm += -@
+DTC_FLAGS_dra72-evm += -@
+DTC_FLAGS_dra72-evm-revc += -@
+DTC_FLAGS_dra71-evm += -@
-- 
1.9.1