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>
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index a501c1c..e601c45 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1342,6 +1342,27 @@ static const char *acpi_fwnode_get_name(const struct fwnode_handle *fwnode)
return acpi_device_bid(adev);
}
+static const char *
+acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent;
+
+ /* Is this the root node? */
+ parent = fwnode_get_parent(fwnode);
+ if (!parent)
+ return "";
+
+ /* Is this 2nd node from the root? */
+ parent = fwnode_get_next_parent(parent);
+ if (!parent)
+ return "";
+
+ fwnode_handle_put(parent);
+
+ /* ACPI device or data node. */
+ return ".";
+}
+
static struct fwnode_handle *
acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
{
@@ -1383,6 +1404,7 @@ acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
.get_next_child_node = acpi_get_next_subnode, \
.get_named_child_node = acpi_fwnode_get_named_child_node, \
.get_name = acpi_fwnode_get_name, \
+ .get_name_prefix = acpi_fwnode_get_name_prefix, \
.get_reference_args = acpi_fwnode_get_reference_args, \
.graph_get_next_endpoint = \
acpi_graph_get_next_endpoint, \