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authorSakari Ailus <sakari.ailus@linux.intel.com>2019-10-03 15:32:13 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-10-11 12:26:55 +0300
commite7e242bccb209b5f73455b33928b8680cc6e3319 (patch)
tree71ab6dcb21967662c41dae3fd869b421f5775b60 /drivers/base/swnode.c
parentbc0500c1e43d95cca5352d2345fb0769f314ba22 (diff)
downloadlinux-e7e242bccb209b5f73455b33928b8680cc6e3319.tar.xz
device property: Add a function to obtain a node's prefix
The prefix is used for printing purpose before a node, and it also works as a separator between two nodes. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Acked-by: Rob Herring <robh@kernel.org> (for OF) Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/swnode.c')
-rw-r--r--drivers/base/swnode.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index eacca6a6626b..12ca439bab30 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -526,6 +526,27 @@ software_node_get_name(const struct fwnode_handle *fwnode)
return kobject_name(&swnode->kobj);
}
+static const char *
+software_node_get_name_prefix(const struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent;
+ const char *prefix;
+
+ parent = fwnode_get_parent(fwnode);
+ if (!parent)
+ return "";
+
+ /* Figure out the prefix from the parents. */
+ while (is_software_node(parent))
+ parent = fwnode_get_next_parent(parent);
+
+ prefix = fwnode_get_name_prefix(parent);
+ fwnode_handle_put(parent);
+
+ /* Guess something if prefix was NULL. */
+ return prefix ?: "/";
+}
+
static struct fwnode_handle *
software_node_get_parent(const struct fwnode_handle *fwnode)
{
@@ -627,6 +648,7 @@ static const struct fwnode_operations software_node_ops = {
.property_read_int_array = software_node_read_int_array,
.property_read_string_array = software_node_read_string_array,
.get_name = software_node_get_name,
+ .get_name_prefix = software_node_get_name_prefix,
.get_parent = software_node_get_parent,
.get_next_child_node = software_node_get_next_child,
.get_named_child_node = software_node_get_named_child_node,