1 files changed, 62 insertions, 3 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 3b64d0bf5bba..cd87a36495be 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -138,7 +138,7 @@ struct platform_device *of_device_alloc(struct device_node *np,
 	}
 
 	dev->dev.of_node = of_node_get(np);
-	dev->dev.parent = parent;
+	dev->dev.parent = parent ? : &platform_bus;
 
 	if (bus_id)
 		dev_set_name(&dev->dev, "%s", bus_id);
@@ -291,7 +291,7 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
 
 	/* setup generic device info */
 	dev->dev.of_node = of_node_get(node);
-	dev->dev.parent = parent;
+	dev->dev.parent = parent ? : &platform_bus;
 	dev->dev.platform_data = platform_data;
 	if (bus_id)
 		dev_set_name(&dev->dev, "%s", bus_id);
@@ -500,6 +500,7 @@ int of_platform_populate(struct device_node *root,
 		if (rc)
 			break;
 	}
+	of_node_set_flag(root, OF_POPULATED_BUS);
 
 	of_node_put(root);
 	return rc;
@@ -542,8 +543,66 @@ static int of_platform_device_destroy(struct device *dev, void *data)
  */
 void of_platform_depopulate(struct device *parent)
 {
-	device_for_each_child(parent, NULL, of_platform_device_destroy);
+	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
+		device_for_each_child(parent, NULL, of_platform_device_destroy);
+		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
+	}
 }
 EXPORT_SYMBOL_GPL(of_platform_depopulate);
 
+#ifdef CONFIG_OF_DYNAMIC
+static int of_platform_notify(struct notifier_block *nb,
+				unsigned long action, void *arg)
+{
+	struct of_reconfig_data *rd = arg;
+	struct platform_device *pdev_parent, *pdev;
+	bool children_left;
+
+	switch (of_reconfig_get_state_change(action, rd)) {
+	case OF_RECONFIG_CHANGE_ADD:
+		/* verify that the parent is a bus */
+		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
+			return NOTIFY_OK;	/* not for us */
+
+		/* pdev_parent may be NULL when no bus platform device */
+		pdev_parent = of_find_device_by_node(rd->dn->parent);
+		pdev = of_platform_device_create(rd->dn, NULL,
+				pdev_parent ? &pdev_parent->dev : NULL);
+		of_dev_put(pdev_parent);
+
+		if (pdev == NULL) {
+			pr_err("%s: failed to create for '%s'\n",
+					__func__, rd->dn->full_name);
+			/* of_platform_device_create tosses the error code */
+			return notifier_from_errno(-EINVAL);
+		}
+		break;
+
+	case OF_RECONFIG_CHANGE_REMOVE:
+		/* find our device by node */
+		pdev = of_find_device_by_node(rd->dn);
+		if (pdev == NULL)
+			return NOTIFY_OK;	/* no? not meant for us */
+
+		/* unregister takes one ref away */
+		of_platform_device_destroy(&pdev->dev, &children_left);
+
+		/* and put the reference of the find */
+		of_dev_put(pdev);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block platform_of_notifier = {
+	.notifier_call = of_platform_notify,
+};
+
+void of_platform_register_reconfig_notifier(void)
+{
+	WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
+}
+#endif /* CONFIG_OF_DYNAMIC */
+
 #endif /* CONFIG_OF_ADDRESS */