dtoc: Add a way to read a phandle with params

Add a function to read a phandle and associated name and offset. This is
useful for binman.

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

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/dtoc/fdt_util.py b/tools/dtoc/fdt_util.py
index d7c38ad1e03..f34316632a7 100644
--- a/tools/dtoc/fdt_util.py
+++ b/tools/dtoc/fdt_util.py
@@ -281,6 +281,34 @@ def GetPhandleList(node, propname):
         value = [value]
     return [fdt32_to_cpu(v) for v in value]
 
+def GetPhandleNameOffset(node, propname):
+    """Get a <&phandle>, "string", <offset> value from a property
+
+    Args:
+        node: Node object to read from
+        propname: property name to read
+
+    Returns:
+        tuple:
+            Node object
+            str
+            int
+        or None if the property does not exist
+    """
+    prop = node.props.get(propname)
+    if not prop:
+        return None
+    value = prop.bytes
+    phandle = fdt32_to_cpu(value[:4])
+    node = node.GetFdt().LookupPhandle(phandle)
+    name = ''
+    for byte in value[4:]:
+        if not byte:
+            break
+        name += chr(byte)
+    val = fdt32_to_cpu(value[4 + len(name) + 1:])
+    return node, name, val
+
 def GetDatatype(node, propname, datatype):
     """Get a value of a given type from a property