diff --git a/drivers/mfd/mcp-core.c b/drivers/mfd/mcp-core.c
index 6063dc2b52e8878d2bd60b01b7a99b632dccdb79..57271cb3b3160a190b55e5043772296575a1ea54 100644
--- a/drivers/mfd/mcp-core.c
+++ b/drivers/mfd/mcp-core.c
@@ -214,7 +214,7 @@ EXPORT_SYMBOL(mcp_host_alloc);
 
 int mcp_host_register(struct mcp *mcp)
 {
-	strcpy(mcp->attached_device.bus_id, "mcp0");
+	dev_set_name(&mcp->attached_device, "mcp0");
 	return device_register(&mcp->attached_device);
 }
 EXPORT_SYMBOL(mcp_host_register);
diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c
index 6860c924f3643a6f8ab679485a8b2e322cb1ac01..fea9085fe52c67e089f38fbded9ae0fb1f83b389 100644
--- a/drivers/mfd/ucb1x00-core.c
+++ b/drivers/mfd/ucb1x00-core.c
@@ -492,7 +492,7 @@ static int ucb1x00_probe(struct mcp *mcp)
 
 	ucb->dev.class = &ucb1x00_class;
 	ucb->dev.parent = &mcp->attached_device;
-	strlcpy(ucb->dev.bus_id, "ucb1x00", sizeof(ucb->dev.bus_id));
+	dev_set_name(&ucb->dev, "ucb1x00");
 
 	spin_lock_init(&ucb->lock);
 	spin_lock_init(&ucb->io_lock);