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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-03-28 10:52:17 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:00:27 +0200
commitafaf26fd8458be29949ae5a52c65a464a1b0cbb6 (patch)
treed73b4b4f73b0fe5aa5df5bc4932aa5fa3c8a9d8d
parentdfa672fbc0d9e83ff0dc1a75f1f5d0e59a30706b (diff)
device property: Add fwnode_get_parent()
Now that ACPI has support for returning parent firmware node for both types of nodes we can expose this to others as well. This adds a new function fwnode_get_parent() that can be used for DT and ACPI nodes to retrieve the parent firmware node. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/base/property.c25
-rw-r--r--include/linux/property.h2
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c
index c458c63e353f..a25233430d18 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -932,6 +932,31 @@ int device_add_properties(struct device *dev,
EXPORT_SYMBOL_GPL(device_add_properties);
/**
+ * fwnode_get_parent - Return parent firwmare node
+ * @fwnode: Firmware whose parent is retrieved
+ *
+ * Return parent firmware node of the given node if possible or %NULL if no
+ * parent was available.
+ */
+struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent = NULL;
+
+ if (is_of_node(fwnode)) {
+ struct device_node *node;
+
+ node = of_get_parent(to_of_node(fwnode));
+ if (node)
+ parent = &node->fwnode;
+ } else if (is_acpi_node(fwnode)) {
+ parent = acpi_node_get_parent(fwnode);
+ }
+
+ return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_parent);
+
+/**
* device_get_next_child_node - Return the next child node handle for a device
* @dev: Device to find the next child node for.
* @child: Handle to one of the device's child nodes or a null handle.
diff --git a/include/linux/property.h b/include/linux/property.h
index 64e3a9c6d95f..ab0a8160cef6 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -70,6 +70,8 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
int fwnode_property_match_string(struct fwnode_handle *fwnode,
const char *propname, const char *string);
+struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode);
+
struct fwnode_handle *device_get_next_child_node(struct device *dev,
struct fwnode_handle *child);