dtoc: Move the fdt library selection into fdt_select

Rather than have dtc worry about which fdt library to use, move this into
a helper file. Add a function which creates a new Fdt object and scans it,
regardless of the implementation.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/dtoc/fdt_select.py b/tools/dtoc/fdt_select.py
new file mode 100644
index 0000000000..5aff297c8f
--- /dev/null
+++ b/tools/dtoc/fdt_select.py
@@ -0,0 +1,23 @@
+#!/usr/bin/python
+#
+# Copyright (C) 2016 Google, Inc
+# Written by Simon Glass <sjg@chromium.org>
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+# Bring in either the normal fdt library (which relies on libfdt) or the
+# fallback one (which uses fdtget and is slower). Both provide the same
+# interface for this file to use.
+try:
+    import fdt
+    have_libfdt = True
+except ImportError:
+    have_libfdt = False
+    import fdt_fallback as fdt
+
+def FdtScan(fname):
+    """Returns a new Fdt object from the implementation we are using"""
+    dtb = fdt.Fdt(fname)
+    dtb.Scan()
+    return dtb