dtoc: Allow the device tree to be compiled from source
If a source device tree is provide to the Fdt() constructors, compile it
automatically. This will be used in tests, where we want to build a
particular test .dts file and check that it works correctly in binman.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/fdt_util.py b/tools/dtoc/fdt_util.py
index 6b57248..3e25a8b 100644
--- a/tools/dtoc/fdt_util.py
+++ b/tools/dtoc/fdt_util.py
@@ -6,7 +6,12 @@
# SPDX-License-Identifier: GPL-2.0+
#
+import os
import struct
+import tempfile
+
+import command
+import tools
def fdt32_to_cpu(val):
"""Convert a device tree cell to an integer
@@ -18,3 +23,39 @@
A native-endian integer value
"""
return struct.unpack(">I", val)[0]
+
+def EnsureCompiled(fname):
+ """Compile an fdt .dts source file into a .dtb binary blob if needed.
+
+ Args:
+ fname: Filename (if .dts it will be compiled). It not it will be
+ left alone
+
+ Returns:
+ Filename of resulting .dtb file
+ """
+ _, ext = os.path.splitext(fname)
+ if ext != '.dts':
+ return fname
+
+ dts_input = tools.GetOutputFilename('source.dts')
+ dtb_output = tools.GetOutputFilename('source.dtb')
+
+ search_paths = [os.path.join(os.getcwd(), 'include')]
+ root, _ = os.path.splitext(fname)
+ args = ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
+ args += ['-Ulinux']
+ for path in search_paths:
+ args.extend(['-I', path])
+ args += ['-o', dts_input, fname]
+ command.Run('cc', *args)
+
+ # If we don't have a directory, put it in the tools tempdir
+ search_list = []
+ for path in search_paths:
+ search_list.extend(['-i', path])
+ args = ['-I', 'dts', '-o', dtb_output, '-O', 'dtb']
+ args.extend(search_list)
+ args.append(dts_input)
+ command.Run('dtc', *args)
+ return dtb_output