Add new topo_list_dapms.py demo

Add simple demo showing how to get started with tplgtool2.py

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

Author: marc-hb

tools/topo_list_dapms.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+
+"""
+Simple demo showing how to get started with the tplgtool2.py parser.
+
+Tip: try these commands interactively in "ipython3"; with TAB completion.
+"""
+
+import sys
+from tplgtool2 import TplgBinaryFormat, TplgType, DapmType
+
+TPLG_FORMAT = TplgBinaryFormat()
+
+
+def main():
+    "Main function"
+
+    parsed_tplg = TPLG_FORMAT.parse_file(sys.argv[1])
+
+    # pylint: disable=invalid-name
+    DAPMs = [
+        item for item in parsed_tplg if item.header.type == TplgType.DAPM_WIDGET.name
+    ]
+
+    for dapm in DAPMs:
+
+        schedulers = [b for b in dapm.blocks if b.widget.id == DapmType.SCHEDULER.name]
+
+        assert len(schedulers) <= 1
+
+        sched = schedulers[0].widget.name if len(schedulers) == 1 else "none"
+
+        print(f"\n --- SCHEDULER = {sched} ------- \n")
+
+        for block in dapm.blocks:
+            if block.widget.id == DapmType.SCHEDULER.name:
+                continue
+            print(f"{block.widget.id}: {block.widget.name}")
+
+
+if __name__ == "__main__":
+    main()