Merge tag 'devicetree-fixes-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

torvalds · torvalds · commit fd6868d82b82 · 2018-09-02T10:56:01.000-07:00
Pull devicetree updates from Rob Herring:
 "A couple of new helper functions in preparation for some tree wide
  clean-ups.

  I'm sending these new helpers now for rc2 in order to simplify the
  dependencies on subsequent cleanups across the tree in 4.20"

* tag 'devicetree-fixes-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: Add device_type access helper functions
  of: add node name compare helper functions
  of: add helper to lookup compatible child node
diff --git a/drivers/of/base.c b/drivers/of/base.c
@@ -54,6 +54,28 @@ DEFINE_MUTEX(of_mutex);
  */
 DEFINE_RAW_SPINLOCK(devtree_lock);
 
+bool of_node_name_eq(const struct device_node *np, const char *name)
+{
+	const char *node_name;
+	size_t len;
+
+	if (!np)
+		return false;
+
+	node_name = kbasename(np->full_name);
+	len = strchrnul(node_name, '@') - node_name;
+
+	return (strlen(name) == len) && (strncmp(node_name, name, len) == 0);
+}
+
+bool of_node_name_prefix(const struct device_node *np, const char *prefix)
+{
+	if (!np)
+		return false;
+
+	return strncmp(kbasename(np->full_name), prefix, strlen(prefix)) == 0;
+}
+
 int of_n_addr_cells(struct device_node *np)
 {
 	u32 cells;
@@ -719,6 +741,31 @@ struct device_node *of_get_next_available_child(const struct device_node *node,
 }
 EXPORT_SYMBOL(of_get_next_available_child);
 
+/**
+ * of_get_compatible_child - Find compatible child node
+ * @parent:	parent node
+ * @compatible:	compatible string
+ *
+ * Lookup child node whose compatible property contains the given compatible
+ * string.
+ *
+ * Returns a node pointer with refcount incremented, use of_node_put() on it
+ * when done; or NULL if not found.
+ */
+struct device_node *of_get_compatible_child(const struct device_node *parent,
+				const char *compatible)
+{
+	struct device_node *child;
+
+	for_each_child_of_node(parent, child) {
+		if (of_device_is_compatible(child, compatible))
+			break;
+	}
+
+	return child;
+}
+EXPORT_SYMBOL(of_get_compatible_child);
+
 /**
  *	of_get_child_by_name - Find the child node by name for a given parent
  *	@node:	parent node
diff --git a/include/linux/of.h b/include/linux/of.h
@@ -256,6 +256,9 @@ static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 
+extern bool of_node_name_eq(const struct device_node *np, const char *name);
+extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);
+
 static inline const char *of_node_full_name(const struct device_node *np)
 {
 	return np ? np->full_name : "<no-node>";
@@ -290,6 +293,8 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
 extern struct device_node *of_get_next_available_child(
 	const struct device_node *node, struct device_node *prev);
 
+extern struct device_node *of_get_compatible_child(const struct device_node *parent,
+					const char *compatible);
 extern struct device_node *of_get_child_by_name(const struct device_node *node,
 					const char *name);
 
@@ -561,6 +566,16 @@ static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
 	return NULL;
 }
 
+static inline bool of_node_name_eq(const struct device_node *np, const char *name)
+{
+	return false;
+}
+
+static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
+{
+	return false;
+}
+
 static inline const char* of_node_full_name(const struct device_node *np)
 {
 	return "<no-node>";
@@ -632,6 +647,12 @@ static inline bool of_have_populated_dt(void)
 	return false;
 }
 
+static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
+					const char *compatible)
+{
+	return NULL;
+}
+
 static inline struct device_node *of_get_child_by_name(
 					const struct device_node *node,
 					const char *name)
@@ -967,6 +988,18 @@ static inline struct device_node *of_find_matching_node(
 	return of_find_matching_node_and_match(from, matches, NULL);
 }
 
+static inline const char *of_node_get_device_type(const struct device_node *np)
+{
+	return of_get_property(np, "type", NULL);
+}
+
+static inline bool of_node_is_type(const struct device_node *np, const char *type)
+{
+	const char *match = of_node_get_device_type(np);
+
+	return np && match && type && !strcmp(match, type);
+}
+
 /**
  * of_property_count_u8_elems - Count the number of u8 elements in a property
  *
