fix

esphome/__main__.py

@@ -1002,6 +1002,12 @@ def parse_args(argv):
         action="append",
         default=[],
     )
+    options_parser.add_argument(
+        "--ignore-pin-conflicts",
+        help="Disable pin conflict validation (for testing grouped components)",
+        action="store_true",
+        default=False,
+    )
 
     parser = argparse.ArgumentParser(
         description=f"ESPHome {const.__version__}", parents=[options_parser]
@@ -1260,6 +1266,7 @@ def run_esphome(argv):
 
     args = parse_args(argv)
     CORE.dashboard = args.dashboard
+    CORE.ignore_pin_conflicts = args.ignore_pin_conflicts
 
     # Create address cache from command-line arguments
     CORE.address_cache = AddressCache.from_cli_args(

esphome/core/__init__.py

@@ -529,6 +529,8 @@ class EsphomeCore:
         self.dashboard = False
         # True if command is run from vscode api
         self.vscode = False
+        # True if pin conflict validation should be ignored
+        self.ignore_pin_conflicts = False
         # The name of the node
         self.name: str | None = None
         # The friendly name of the node

esphome/pins.py

@@ -118,7 +118,11 @@ class PinRegistry(dict):
                         parent_config = fconf.get_config_for_path(parent_path)
                         final_val_fun(pin_config, parent_config)
                     allow_others = pin_config.get(CONF_ALLOW_OTHER_USES, False)
-                    if count != 1 and not allow_others:
+                    if (
+                        count != 1
+                        and not allow_others
+                        and not CORE.ignore_pin_conflicts
+                    ):
                         raise cv.Invalid(
                             f"Pin {pin_config[CONF_NUMBER]} is used in multiple places"
                         )