linux-kernel - [PATCH V4 2/3] scripts: dtc: Build fdtoverlay tool

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Date:   Tue, 12 Jan 2021 13:59:01 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH V4 2/3] scripts: dtc: Build fdtoverlay tool

We will start building overlays for platforms soon in the kernel and
would need fdtoverlay going forward. Lets start building it.

The fdtoverlay program applies (or merges) one ore more overlay dtb
blobs to a base dtb blob. The kernel build system would later use
fdtoverlay to generate the overlaid blobs based on platform specific
configurations.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 scripts/dtc/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 4852bf44e913..5f19386a49eb 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -1,13 +1,17 @@
 # SPDX-License-Identifier: GPL-2.0
 # scripts/dtc makefile
 
-hostprogs-always-$(CONFIG_DTC)		+= dtc
+hostprogs-always-$(CONFIG_DTC)		+= dtc fdtoverlay
 hostprogs-always-$(CHECK_DT_BINDING)	+= dtc
 
 dtc-objs	:= dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
 		   srcpos.o checks.o util.o
 dtc-objs	+= dtc-lexer.lex.o dtc-parser.tab.o
 
+libfdt-objs	:= fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o
+libfdt		= $(addprefix libfdt/,$(libfdt-objs))
+fdtoverlay-objs	:= $(libfdt) fdtoverlay.o util.o
+
 # Source files need to get at the userspace version of libfdt_env.h to compile
 HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
 
-- 
2.25.0.rc1.19.g042ed3e048af