Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <redacted>
Cc: linux-serial at vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: kernel at pengutronix.de
Cc: Alan Cox <redacted>
Cc: Grant Likely <redacted>
Cc: Nicolas Ferre <redacted>
---
 drivers/of/base.c  |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h |    7 +++++++
 2 files changed, 53 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f2f63c8..72c49ce 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c

@@ -1470,3 +1470,49 @@ 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
+ * @np:                Pointer to the given device_node
+ * @option:    parsed option
+ *
+ * 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, char **option)
+{
+       const char *name;
+       struct device_node *dn_stdout;
+       bool is_stdout = 0;
+       const char *tmp;
+       const char *tmp_option;
+
+       name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+       if (name == NULL)
+               name = of_get_property(of_chosen, "stdout-path", NULL);
+
+       if (name == NULL)
+               return 0;
+
+       tmp_option = strchr(name, ':');
+
+       tmp = kstrndup(name, strlen(name) - strlen(tmp_option), GFP_KERNEL);
+       if (!tmp)
+               return 0;
+
+       dn_stdout = of_find_node_by_path(tmp);
+
+       if (dn_stdout && dn_stdout == dn) {
+               is_stdout = 1;
+               tmp_option++;
+               *option = kstrdup(tmp_option, GFP_KERNEL);
+       }
+
+       of_node_put(dn_stdout);
+
+       kfree(tmp);
+
+       return is_stdout;
+}
+EXPORT_SYMBOL_GPL(of_device_is_stdout_path);

diff --git a/include/linux/of.h b/include/linux/of.h
index 681a6c8..6a82e3f 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h

@@ -323,6 +323,8 @@ 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, char **option);
+
 #else /* CONFIG_OF */

 static inline const char* of_node_full_name(struct device_node *np)

@@ -450,6 +452,11 @@ static inline int of_machine_is_compatible(const char *compat)
        return 0;
 }

+static inline int of_device_is_stdout_path(struct device_node *dn, char **option)
+{
+       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) \
--

1.7.10.4