of: add node name compare helper functions

In preparation to remove device_node.name pointer, add helper functions
for node name comparisons which are a common pattern throughout the kernel.

Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index bc420d2aa5f5..9095b8290150 100644
--- 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;
diff --git a/include/linux/of.h b/include/linux/of.h
index b99a1a8c2952..688c52dd7b3e 100644
--- 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>";
@@ -563,6 +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>";