From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
devicetrees may have a linux,stdout-path or stdout-path property
in the chosen node describing the console device. This adds a helper
function to match a device against this property and retrieve the options
so a driver can call add_preferred_console for a matching device.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: kernel@xxxxxxxxxxxxxx
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
---
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
--
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
