linux-kernel - [PATCH V3 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools

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Date:   Thu,  7 Jan 2021 11:55:10 +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 V3 2/2] scripts: dtc: Build fdtoverlay and fdtdump tools

We will start building overlays for platforms soon in the kernel and
would need these tools going forward. Lets start building them.

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.

The fdtdump program prints a readable version of a flat device-tree
file. This is a very useful tool to analyze the details of the overlay's
dtb and the final dtb produced by fdtoverlay after applying the
overlay's dtb to a base dtb.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
V3:
- Updated log
- Remove libfdt_dir

 scripts/dtc/Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 4852bf44e913..472ab8cd590c 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -1,12 +1,17 @@
 # SPDX-License-Identifier: GPL-2.0
 # scripts/dtc makefile
 
-hostprogs-always-$(CONFIG_DTC)		+= dtc
+hostprogs-always-$(CONFIG_DTC)		+= dtc fdtdump 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
+fdtdump-objs	:= fdtdump.o util.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