usb: typec: mux: avoid duplicated orientation switches

Some devices use combo PHYs (i.e. USB3 + DisplayPort), which also
handle the orientation mux. These PHYs are referenced twice from
the USB-C connector (USB super-speed lines and SBU/AUX lines)
resulting in the switch being configured twice. Avoid this by
dropping duplicates.

Signed-off-by: Sebastian Reichel <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Link: https://patch.msgid.link/20260223-typec-mux-duplication-fix-v2-1-0402fefc222e@collabora.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/usb/typec/mux.c

@@ -35,7 +35,9 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode)
 static void *typec_switch_match(const struct fwnode_handle *fwnode,
 				const char *id, void *data)
 {
+	struct typec_switch_dev **sw_devs = data;
 	struct device *dev;
+	int i;
 
 	/*
 	 * Device graph (OF graph) does not give any means to identify the
@@ -56,6 +58,13 @@ static void *typec_switch_match(const struct fwnode_handle *fwnode,
 	dev = class_find_device(&typec_mux_class, NULL, fwnode,
 				switch_fwnode_match);
 
+	/* Skip duplicates */
+	for (i = 0; i < TYPEC_MUX_MAX_DEVS; i++)
+		if (to_typec_switch_dev(dev) == sw_devs[i]) {
+			put_device(dev);
+			return NULL;
+		}
+
 	return dev ? to_typec_switch_dev(dev) : ERR_PTR(-EPROBE_DEFER);
 }
 
@@ -80,7 +89,8 @@ struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode)
 	if (!sw)
 		return ERR_PTR(-ENOMEM);
 
-	count = fwnode_connection_find_matches(fwnode, "orientation-switch", NULL,
+	count = fwnode_connection_find_matches(fwnode, "orientation-switch",
+					       (void **)sw_devs,
 					       typec_switch_match,
 					       (void **)sw_devs,
 					       ARRAY_SIZE(sw_devs));