[PATCH 02/15] device property: Add fwnode_get_parent()

Sakari Ailus
2017-01-27T16:11:27Z

From: Mika Westerberg <mika.westerberg@linux.intel.com>

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>
---
drivers/base/property.c | 25 +++++++++++++++++++++++++
include/linux/property.h | 2 ++
2 files changed, 27 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 43a36d6..384998a 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -867,6 +867,31 @@ int device_add_properties(struct device *dev, struct property_entry *properties)
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 856e50b..85060bf 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);

--
2.7.4