diff --git a/tools/tplgtool-ng/tplgtool.py b/tools/tplgtool-ng/tplgtool.py
index efaa6b5f7..b39a29d4f 100755
--- a/tools/tplgtool-ng/tplgtool.py
+++ b/tools/tplgtool-ng/tplgtool.py
@@ -5,7 +5,10 @@
 import os
 import sys
 import typing
+from collections import defaultdict
+from collections.abc import Callable
 from construct import this, Container, ListContainer, Struct, Enum, FlagsEnum, Const, Switch, Array, Bytes, GreedyRange, FocusedSeq, Padded, Padding, PaddedString, Flag, Byte, Int16ul, Int32ul, Int64ul, Terminated
+from functools import cached_property
 
 class TplgType(enum.IntEnum):
     "File and Block header data types. `SND_SOC_TPLG_TYPE_`"
@@ -464,6 +467,63 @@ def _node_name_in_graph(self, widget: Container) -> typing.Union[str, None]:
                     return ename
         return None
 
+    @cached_property
+    def _nodes_dict(self) -> "dict[str, Container]":
+        nodes = {}
+        for widget in self._widget_list:
+            nodes[widget["widget"]["name"]] = widget
+            nodes[widget["widget"]["sname"]] = widget
+        return nodes
+
+    @cached_property
+    def _graph_edge_list(self) -> "typing.Tuple[dict[Container, list[Container]], dict[Container, list[Container]]]":
+        r"""
+        Return edge list for graph: forward edge list, backward edge list
+
+        Edge list is a dictionary like:
+            { source1: [sink1, sink2, ...], ... }
+        """
+
+        forward_edge = defaultdict(list)
+        backward_edge = defaultdict(list)
+        node_dict = self._nodes_dict
+        for edge in self._graph_list:
+            forward_edge[node_dict[edge["source"]]].append(node_dict[edge["sink"]])
+            backward_edge[node_dict[edge["sink"]]].append(node_dict[edge["source"]])
+        return forward_edge, backward_edge
+
+    def find_comp_for_pcm(self, pcm: Container, prefix: str) -> "list[set[Container]]":
+        r"""
+        find specified components for PCM.
+
+        return a list:
+            [0]: specified components connected to playback
+            [1]: specified components connected to capture
+        """
+        node_dict = self._nodes_dict
+        prefix = prefix.upper()
+        return [self.find_connected_comp(node_dict[cap["name"]], lambda node: node["widget"]["name"].startswith(prefix)) for cap in pcm["caps"]]
+    
+    def find_connected_comp(self, ref_node: Container, predicate: Callable[[Container], bool]) -> "set[Container]":
+        "find specified components connected to ref_node"
+
+        forward_edge, backward_edge = self._graph_edge_list
+        collected = set()
+        TplgAdaptor._recursive_search_comp(forward_edge, ref_node, predicate, collected)
+        TplgAdaptor._recursive_search_comp(backward_edge, ref_node, predicate, collected)
+        return collected
+
+    @staticmethod
+    def _recursive_search_comp(
+        edge_list: "dict[Container, list[Container]]",
+        node: Container,
+        predicate: Callable[[Container], bool],
+        collected: "set[Container]"):
+        if predicate(node):
+            collected.add(node)
+        for next_node in edge_list[node]:
+            TplgAdaptor._recursive_search_comp(edge_list, next_node, predicate, collected)
+
 if __name__ == "__main__":
     from pathlib import Path