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 sjg@chromium.org ---
lib/libfdt/libfdt.swig | 3 +++ tools/dtoc/fdt.py | 11 +++++++++++ tools/dtoc/fdt_normal.py | 18 ++++++++++++++++++ 3 files changed, 32 insertions(+)
diff --git a/lib/libfdt/libfdt.swig b/lib/libfdt/libfdt.swig index 0cb7977..b24c72b 100644 --- a/lib/libfdt/libfdt.swig +++ b/lib/libfdt/libfdt.swig @@ -108,3 +108,6 @@ int fdt_delprop(void *fdt, int nodeoffset, const char *name);
const char *fdt_strerror(int errval); int fdt_pack(void *fdt); + +int fdt_totalsize(const void *fdt); +int fdt_off_dt_struct(const void *fdt); 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