of: add optional options parameter to of_find_node_by_path()
Update of_find_node_by_path():
1) Rename function to of_find_node_opts_by_path(), adding an optional
pointer argument. Provide a static inline wrapper version of
of_find_node_by_path() which calls the new function with NULL as
the optional argument.
2) Ignore any part of the path beyond and including the ':' separator.
3) Set the new provided pointer argument to the beginning of the string
following the ':' separator.
4: Add tests.
Signed-off-by: Leif Lindholm <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 99bc95e..bdf051d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -714,10 +714,15 @@
{
struct device_node *child;
int len = strchrnul(path, '/') - path;
+ int term;
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))
@@ -730,11 +735,14 @@
}
/**
- * of_find_node_by_path - Find a node matching a full OF path
+ * of_find_node_opts_by_path - Find a node matching a full OF path
* @path: Either the full path to match, or if the path does not
* start with '/', the name of a property of the /aliases
* node (an alias). In the case of an alias, the node
* matching the alias' value will be returned.
+ * @opts: Address of a pointer into which to store the start of
+ * an options string appended to the end of the path with
+ * a ':' separator.
*
* Valid paths:
* /foo/bar Full path
@@ -744,11 +752,15 @@
* Returns a node pointer with refcount incremented, use
* of_node_put() on it when done.
*/
-struct device_node *of_find_node_by_path(const char *path)
+struct device_node *of_find_node_opts_by_path(const char *path, const char **opts)
{
struct device_node *np = NULL;
struct property *pp;
unsigned long flags;
+ const char *separator = strchr(path, ':');
+
+ if (opts)
+ *opts = separator ? separator + 1 : NULL;
if (strcmp(path, "/") == 0)
return of_node_get(of_root);
@@ -756,7 +768,7 @@
/* The path could begin with an alias */
if (*path != '/') {
char *p = strchrnul(path, '/');
- int len = p - path;
+ int len = separator ? separator - path : p - path;
/* of_aliases must not be NULL */
if (!of_aliases)
@@ -785,7 +797,7 @@
raw_spin_unlock_irqrestore(&devtree_lock, flags);
return np;
}
-EXPORT_SYMBOL(of_find_node_by_path);
+EXPORT_SYMBOL(of_find_node_opts_by_path);
/**
* of_find_node_by_name - Find a node by its "name" property
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 7a7ae07..1807a04 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -47,6 +47,7 @@
static void __init of_selftest_find_node_by_name(void)
{
struct device_node *np;
+ const char *options;
np = of_find_node_by_path("/testcase-data");
selftest(np && !strcmp("/testcase-data", np->full_name),
@@ -87,6 +88,35 @@
np = of_find_node_by_path("testcase-alias/missing-path");
selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
of_node_put(np);
+
+ np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
+ selftest(np && !strcmp("testoption", options),
+ "option path test failed\n");
+ of_node_put(np);
+
+ np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
+ selftest(np, "NULL option path test failed\n");
+ of_node_put(np);
+
+ np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
+ &options);
+ selftest(np && !strcmp("testaliasoption", options),
+ "option alias path test failed\n");
+ of_node_put(np);
+
+ np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
+ selftest(np, "NULL option alias path test failed\n");
+ of_node_put(np);
+
+ options = "testoption";
+ np = of_find_node_opts_by_path("testcase-alias", &options);
+ selftest(np && !options, "option clearing test failed\n");
+ of_node_put(np);
+
+ options = "testoption";
+ np = of_find_node_opts_by_path("/", &options);
+ selftest(np && !options, "option clearing root node test failed\n");
+ of_node_put(np);
}
static void __init of_selftest_dynamic(void)
