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-rw-r--r--drivers/of/base.c26
-rw-r--r--include/linux/of.h7
2 files changed, 33 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 5c54279..1c3c79c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -32,6 +32,7 @@ struct device_node *of_allnodes;
EXPORT_SYMBOL(of_allnodes);
struct device_node *of_chosen;
struct device_node *of_aliases;
+static struct device_node *of_stdout;
DEFINE_MUTEX(of_aliases_mutex);
@@ -1595,6 +1596,15 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
of_chosen = of_find_node_by_path("/chosen");
if (of_chosen == NULL)
of_chosen = of_find_node_by_path("/chosen@0");
+
+ if (of_chosen) {
+ const char *name;
+
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name)
+ of_stdout = of_find_node_by_path(name);
+ }
+
of_aliases = of_find_node_by_path("/aliases");
if (!of_aliases)
return;
@@ -1703,3 +1713,19 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
return curv;
}
EXPORT_SYMBOL_GPL(of_prop_next_string);
+
+/**
+ * of_device_is_stdout_path - check if a device node matches the
+ * linux,stdout-path property
+ *
+ * Check if this device node matches the linux,stdout-path property
+ * in the chosen node. return true if yes, false otherwise.
+ */
+int of_device_is_stdout_path(struct device_node *dn)
+{
+ if (!of_stdout)
+ return false;
+
+ return of_stdout == dn;
+}
+EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
diff --git a/include/linux/of.h b/include/linux/of.h
index 1fd08ca..429e168 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -343,6 +343,8 @@ const char *of_prop_next_string(struct property *prop, const char *cur);
s; \
s = of_prop_next_string(prop, s))
+int of_device_is_stdout_path(struct device_node *dn);
+
#else /* CONFIG_OF */
static inline const char* of_node_full_name(struct device_node *np)
@@ -505,6 +507,11 @@ static inline int of_machine_is_compatible(const char *compat)
return 0;
}
+static inline int of_device_is_stdout_path(struct device_node *dn)
+{
+ return 0;
+}
+
#define of_match_ptr(_ptr) NULL
#define of_match_node(_matches, _node) NULL
#define of_property_for_each_u32(np, propname, prop, p, u) \
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