1 files changed, 69 insertions, 16 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 0a8aeb8523fe..a1aa0c7dee50 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -714,16 +714,12 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
 						const char *path)
 {
 	struct device_node *child;
-	int len = strchrnul(path, '/') - path;
-	int term;
+	int len;
 
+	len = strcspn(path, "/:");
 	if (!len)
 		return NULL;
 
-	term = strchrnul(path, ':') - path;
-	if (term < len)
-		len = term;
-
 	__for_each_child_of_node(parent, child) {
 		const char *name = strrchr(child->full_name, '/');
 		if (WARN(!name, "malformed device_node %s\n", child->full_name))
@@ -768,8 +764,12 @@ struct device_node *of_find_node_opts_by_path(const char *path, const char **opt
 
 	/* The path could begin with an alias */
 	if (*path != '/') {
-		char *p = strchrnul(path, '/');
-		int len = separator ? separator - path : p - path;
+		int len;
+		const char *p = separator;
+
+		if (!p)
+			p = strchrnul(path, '/');
+		len = p - path;
 
 		/* of_aliases must not be NULL */
 		if (!of_aliases)
@@ -794,6 +794,8 @@ struct device_node *of_find_node_opts_by_path(const char *path, const char **opt
 		path++; /* Increment past '/' delimiter */
 		np = __of_find_node_by_path(np, path);
 		path = strchrnul(path, '/');
+		if (separator && separator < path)
+			break;
 	}
 	raw_spin_unlock_irqrestore(&devtree_lock, flags);
 	return np;
@@ -1958,6 +1960,32 @@ int of_alias_get_id(struct device_node *np, const char *stem)
 }
 EXPORT_SYMBOL_GPL(of_alias_get_id);
 
+/**
+ * of_alias_get_highest_id - Get highest alias id for the given stem
+ * @stem:	Alias stem to be examined
+ *
+ * The function travels the lookup table to get the highest alias id for the
+ * given alias stem.  It returns the alias id if found.
+ */
+int of_alias_get_highest_id(const char *stem)
+{
+	struct alias_prop *app;
+	int id = -ENODEV;
+
+	mutex_lock(&of_mutex);
+	list_for_each_entry(app, &aliases_lookup, link) {
+		if (strcmp(app->stem, stem) != 0)
+			continue;
+
+		if (app->id > id)
+			id = app->id;
+	}
+	mutex_unlock(&of_mutex);
+
+	return id;
+}
+EXPORT_SYMBOL_GPL(of_alias_get_highest_id);
+
 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 			       u32 *pu)
 {
@@ -2081,13 +2109,44 @@ int of_graph_parse_endpoint(const struct device_node *node,
 EXPORT_SYMBOL(of_graph_parse_endpoint);
 
 /**
+ * of_graph_get_port_by_id() - get the port matching a given id
+ * @parent: pointer to the parent device node
+ * @id: id of the port
+ *
+ * Return: A 'port' node pointer with refcount incremented. The caller
+ * has to use of_node_put() on it when done.
+ */
+struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
+{
+	struct device_node *node, *port;
+
+	node = of_get_child_by_name(parent, "ports");
+	if (node)
+		parent = node;
+
+	for_each_child_of_node(parent, port) {
+		u32 port_id = 0;
+
+		if (of_node_cmp(port->name, "port") != 0)
+			continue;
+		of_property_read_u32(port, "reg", &port_id);
+		if (id == port_id)
+			break;
+	}
+
+	of_node_put(node);
+
+	return port;
+}
+EXPORT_SYMBOL(of_graph_get_port_by_id);
+
+/**
  * of_graph_get_next_endpoint() - get next endpoint node
  * @parent: pointer to the parent device node
  * @prev: previous endpoint node, or NULL to get first
  *
  * Return: An 'endpoint' node pointer with refcount incremented. Refcount
- * of the passed @prev node is not decremented, the caller have to use
- * of_node_put() on it when done.
+ * of the passed @prev node is decremented.
  */
 struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 					struct device_node *prev)
@@ -2123,12 +2182,6 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
 		if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
 			      __func__, prev->full_name))
 			return NULL;
-
-		/*
-		 * Avoid dropping prev node refcount to 0 when getting the next
-		 * child below.
-		 */
-		of_node_get(prev);
 	}
 
 	while (1) {