From babdbde68f1b993289462394f209f4010c761246 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 25 Jul 2016 18:59:16 -0600 Subject: dtoc: Support finding the offset of a property Add a way to find the byte offset of a property within the device tree. This is only supported with the normal libfdt implementation since fdtget does not provide this information. Signed-off-by: Simon Glass --- tools/dtoc/fdt.py | 11 +++++++++++ tools/dtoc/fdt_normal.py | 18 ++++++++++++++++++ 2 files changed, 29 insertions(+) (limited to 'tools/dtoc') diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py index 403eb1f..816fdbe 100644 --- a/tools/dtoc/fdt.py +++ b/tools/dtoc/fdt.py @@ -144,6 +144,17 @@ class PropBase: else: return True + def GetOffset(self): + """Get the offset of a property + + This can be implemented by subclasses. + + Returns: + The offset of the property (struct fdt_property) within the + file, or None if not known. + """ + return None + class NodeBase: """A device tree node diff --git a/tools/dtoc/fdt_normal.py b/tools/dtoc/fdt_normal.py index f2cf608..aae258e 100644 --- a/tools/dtoc/fdt_normal.py +++ b/tools/dtoc/fdt_normal.py @@ -43,6 +43,14 @@ class Prop(PropBase): return self.type, self.value = self.BytesToValue(bytes) + def GetOffset(self): + """Get the offset of a property + + Returns: + The offset of the property (struct fdt_property) within the file + """ + return self._node._fdt.GetStructOffset(self._offset) + class Node(NodeBase): """A device tree node @@ -193,6 +201,16 @@ class FdtNormal(Fdt): """Refresh the offset cache""" self._root.Refresh(0) + def GetStructOffset(self, offset): + """Get the file offset of a given struct offset + + Args: + offset: Offset within the 'struct' region of the device tree + Returns: + Position of @offset within the device tree binary + """ + return libfdt.fdt_off_dt_struct(self._fdt) + offset + @classmethod def Node(self, fdt, offset, name, path): """Create a new node -- cgit v1.1