[PATCH 14/15] device property: Add fwnode_get_next_parent()
From: Sakari Ailus <hidden>
Date: 2017-01-27 16:03:09
Also in:
linux-acpi
Subsystem:
driver core, kobjects, debugfs and sysfs, software nodes and device properties, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
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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