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UPSTREAM: device property: Add fwnode_get_next_parent()

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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@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 233872585d)
from v4.12-rc1

BUG=b:62359918
TEST=No regression in camera functionality
TEST=Kernel builds and boots

Change-Id: I3d80dff164c45b75a32f5e8e3152fb1f9757c716
Signed-off-by: Nathan Ciobanu <nathan.d.ciobanu@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/528616
Commit-Ready: Nathan D Ciobanu <nathan.d.ciobanu@intel.com>
Tested-by: Yong Zhi <yong.zhi@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
This commit is contained in:
Sakari Ailus 2017-03-28 10:52:26 +03:00 committed by Tao Huang
parent 5741287331
commit fd424e34f1
2 changed files with 22 additions and 0 deletions
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21
drivers/base/property.c
View File

@ -860,6 +860,27 @@ int device_add_property_set(struct device *dev, const struct property_set *pset)
}
EXPORT_SYMBOL_GPL(device_add_property_set);
/**
* 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 = fwnode_get_parent(fwnode);
fwnode_handle_put(fwnode);
return parent;
}
EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
/**
* fwnode_get_parent - Return parent firwmare node
* @fwnode: Firmware whose parent is retrieved

1
include/linux/property.h
View File

@ -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);