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, 16 insertions, 0 deletions

diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index f01c7b18ea..403eb1fe6d 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -240,3 +240,19 @@ class Fdt:
                 return None
         return node
 
+    def Flush(self):
+        """Flush device tree changes back to the file
+
+        If the device tree has changed in memory, write it back to the file.
+        Subclasses can implement this if needed.
+        """
+        pass
+
+    def Pack(self):
+        """Pack the device tree down to its minimum size
+
+        When nodes and properties shrink or are deleted, wasted space can
+        build up in the device tree binary. Subclasses can implement this
+        to remove that spare space.
+        """
+        pass