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device property: Add fwnode_get_named_child_node()

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Since now we have means to enumerate all children of any fwnode even in
ACPI we can implement fwnode_get_named_child_node(). This is similar than
device_get_named_child_node() with the exception that it can be called to
any fwnode handle. Make device_get_named_child_node() call directly this
new function.

This is useful in cases where we need to be able to find child nodes which
are not direct descendants of the parent device.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2017-03-28 10:52:19 +03:00 committed by Rafael J. Wysocki
parent 34055190b1
commit 21ea73f54c
2 changed files with 19 additions and 5 deletions
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22
drivers/base/property.c
View File

@ -1000,20 +1000,20 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
EXPORT_SYMBOL_GPL(device_get_next_child_node);
/**
* device_get_named_child_node - Return first matching named child node handle
* @dev: Device to find the named child node for.
* fwnode_get_named_child_node - Return first matching named child node handle
* @fwnode: Firmware node to find the named child node for.
* @childname: String to match child node name against.
*/
struct fwnode_handle *device_get_named_child_node(struct device *dev,
struct fwnode_handle *fwnode_get_named_child_node(struct fwnode_handle *fwnode,
const char *childname)
{
struct fwnode_handle *child;
/*
* Find first matching named child node of this device.
* Find first matching named child node of this fwnode.
* For ACPI this will be a data only sub-node.
*/
device_for_each_child_node(dev, child) {
fwnode_for_each_child_node(fwnode, child) {
if (is_of_node(child)) {
if (!of_node_cmp(to_of_node(child)->name, childname))
return child;
@ -1025,6 +1025,18 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
return NULL;
}
EXPORT_SYMBOL_GPL(fwnode_get_named_child_node);
/**
* device_get_named_child_node - Return first matching named child node handle
* @dev: Device to find the named child node for.
* @childname: String to match child node name against.
*/
struct fwnode_handle *device_get_named_child_node(struct device *dev,
const char *childname)
{
return fwnode_get_named_child_node(dev_fwnode(dev), childname);
}
EXPORT_SYMBOL_GPL(device_get_named_child_node);
/**

2
include/linux/property.h
View File

@ -85,6 +85,8 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
for (child = device_get_next_child_node(dev, NULL); child; \
child = device_get_next_child_node(dev, child))
struct fwnode_handle *fwnode_get_named_child_node(struct fwnode_handle *fwnode,
const char *childname);
struct fwnode_handle *device_get_named_child_node(struct device *dev,
const char *childname);