diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 89b359b39893..f1324fe99378 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -32,18 +32,7 @@ static ssize_t modalias_show(struct device *dev,
 	if (len != -ENODEV)
 		return len;
 
-	len = of_device_modalias(dev, buf, PAGE_SIZE);
-	if (len != -ENODEV)
-		return len;
-
-	if (dev->parent->parent->bus == &platform_bus_type) {
-		struct platform_device *pdev =
-			to_platform_device(dev->parent->parent);
-
-		len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
-	}
-
-	return len;
+	return of_device_modalias(dev, buf, PAGE_SIZE);
 }
 static DEVICE_ATTR_RO(modalias);
 
@@ -57,18 +46,13 @@ static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	int rc;
 
+	/* TODO: platform modalias */
+
 	rc = acpi_device_uevent_modalias(dev, env);
 	if (rc != -ENODEV)
 		return rc;
 
-	rc = of_device_uevent_modalias(dev, env);
-	if (rc != -ENODEV)
-		return rc;
-
-	if (dev->parent->parent->bus == &platform_bus_type)
-		rc = dev->parent->parent->bus->uevent(dev, env);
-
-	return rc;
+	return of_device_uevent_modalias(dev, env);
 }
 
 static void serdev_device_release(struct device *dev)
@@ -104,17 +88,11 @@ static int serdev_device_match(struct device *dev, struct device_driver *drv)
 	if (!is_serdev_device(dev))
 		return 0;
 
+	/* TODO: platform matching */
 	if (acpi_driver_match_device(dev, drv))
 		return 1;
 
-	if (of_driver_match_device(dev, drv))
-		return 1;
-
-	if (dev->parent->parent->bus == &platform_bus_type &&
-	    dev->parent->parent->bus->match(dev, drv))
-		return 1;
-
-	return 0;
+	return of_driver_match_device(dev, drv);
 }
 
 /**
@@ -771,33 +749,6 @@ static inline int acpi_serdev_register_devices(struct serdev_controller *ctrl)
 }
 #endif /* CONFIG_ACPI */
 
-static int platform_serdev_register_devices(struct serdev_controller *ctrl)
-{
-	struct serdev_device *serdev;
-	int err;
-
-	if (ctrl->dev.parent->bus != &platform_bus_type)
-		return -ENODEV;
-
-	serdev = serdev_device_alloc(ctrl);
-	if (!serdev) {
-		dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",
-				    dev_name(ctrl->dev.parent));
-		return -ENOMEM;
-	}
-
-	pm_runtime_no_callbacks(&serdev->dev);
-
-	err = serdev_device_add(serdev);
-	if (err) {
-		dev_err(&serdev->dev,
-			"failure adding device. status %d\n", err);
-		serdev_device_put(serdev);
-	}
-
-	return err;
-}
-
 /**
  * serdev_controller_add() - Add an serdev controller
  * @ctrl:	controller to be registered.
@@ -807,7 +758,7 @@ static int platform_serdev_register_devices(struct serdev_controller *ctrl)
  */
 int serdev_controller_add(struct serdev_controller *ctrl)
 {
-	int ret_of, ret_acpi, ret_platform, ret;
+	int ret_of, ret_acpi, ret;
 
 	/* Can't register until after driver model init */
 	if (WARN_ON(!is_registered))
@@ -821,12 +772,9 @@ int serdev_controller_add(struct serdev_controller *ctrl)
 
 	ret_of = of_serdev_register_devices(ctrl);
 	ret_acpi = acpi_serdev_register_devices(ctrl);
-	ret_platform = platform_serdev_register_devices(ctrl);
-	if (ret_of && ret_acpi && ret_platform) {
-		dev_dbg(&ctrl->dev,
-			"no devices registered: of:%pe acpi:%pe platform:%pe\n",
-			ERR_PTR(ret_of), ERR_PTR(ret_acpi),
-			ERR_PTR(ret_platform));
+	if (ret_of && ret_acpi) {
+		dev_dbg(&ctrl->dev, "no devices registered: of:%pe acpi:%pe\n",
+			ERR_PTR(ret_of), ERR_PTR(ret_acpi));
 		ret = -ENODEV;
 		goto err_rpm_disable;
 	}