From da5f74998b9e5e6b706608a4ca625ef0ee195150 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 25 Jul 2016 18:59:15 -0600
Subject: [PATCH] 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>
---
 lib/libfdt/libfdt.swig   |  1 +
 tools/dtoc/fdt.py        | 16 ++++++++++++++++
 tools/dtoc/fdt_normal.py | 11 +++++++++++
 3 files changed, 28 insertions(+)

diff --git a/lib/libfdt/libfdt.swig b/lib/libfdt/libfdt.swig
index ce516fd..0cb7977 100644
--- a/lib/libfdt/libfdt.swig
+++ b/lib/libfdt/libfdt.swig
@@ -107,3 +107,4 @@ int fdt_next_subnode(const void *fdt, int offset);
 int fdt_delprop(void *fdt, int nodeoffset, const char *name);
 
 const char *fdt_strerror(int errval);
+int fdt_pack(void *fdt);
diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index f01c7b1..403eb1f 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
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.