[PATCH 14/15] device property: Add fwnode_get_next_parent()

Sakari Ailus
2017-01-27T16:03:09Z

In order to differentiate the functionality between dropping a reference
to the node (or not) for the benefit of OF, introduce
fwnode_get_next_parent().

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/base/property.c | 29 +++++++++++++++++++++++++++++
include/linux/property.h | 1 +
2 files changed, 30 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 21b103f..d31a31f 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -868,6 +868,35 @@ int device_add_properties(struct device *dev, struct property_entry *properties)
EXPORT_SYMBOL_GPL(device_add_properties);

/**
+ * fwnode_get_next_parent - Iterate to the node's parent
+ * @fwnode: Firmware whose parent is retrieved
+ *
+ * This is like fwnode_get_parent() except that it drops the refcount
+ * on the passed node, making it suitable for iterating through a
+ * node's parents.
+ *
+ * Returns a node pointer with refcount incremented, use
+ * fwnode_handle_node() on it when done.
+ */
+struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent = NULL;
+
+ if (is_of_node(fwnode)) {
+ struct device_node *node;
+
+ node = of_get_next_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_next_parent);
+
+/**
* fwnode_get_parent - Return parent firwmare node
* @fwnode: Firmware whose parent is retrieved
*
diff --git a/include/linux/property.h b/include/linux/property.h
index eb7ba73..760df98 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -73,6 +73,7 @@ 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 *fwnode_get_next_parent(struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
struct fwnode_handle *child);

--
2.7.4

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