dtoc: Support packing the device tree

After any node/property deletion the device tree can be packed to remove
spare space. Add a way to perform this operation.

Note that for fdt_fallback, fdtput automatically packs the device tree after
deletion, so no action is required here.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/tools/dtoc/fdt_normal.py b/tools/dtoc/fdt_normal.py
index 52d8055..f2cf608 100644
--- a/tools/dtoc/fdt_normal.py
+++ b/tools/dtoc/fdt_normal.py
@@ -140,6 +140,17 @@ class FdtNormal(Fdt):
         """
         return self._fdt
 
+    def Flush(self):
+        """Flush device tree changes back to the file"""
+        with open(self._fname, 'wb') as fd:
+            fd.write(self._fdt)
+
+    def Pack(self):
+        """Pack the device tree down to its minimum size"""
+        CheckErr(libfdt.fdt_pack(self._fdt), 'pack')
+        fdt_len = libfdt.fdt_totalsize(self._fdt)
+        del self._fdt[fdt_len:]
+
     def GetProps(self, node, path):
         """Get all properties from a node.