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dt: introduce of_get_child_by_name to get child node by name 

This patch introduces of_get_child_by_name function to get a child node
by its name in a given parent node.

Without this patch each driver code has to iterate the parent and do
a string compare, However having of_get_child_by_name libary function would
avoid code duplication, errors and is more convenient.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Srinivas Kandagatla 2012-09-18 08:10:28 +01:00 committed by Rob Herring
parent ee67016fcc
commit 9c19761a7e
2 changed files with 25 additions and 0 deletions
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23
drivers/of/base.c
View File

@ -363,6 +363,29 @@ struct device_node *of_get_next_child(const struct device_node *node,
} }
EXPORT_SYMBOL(of_get_next_child); EXPORT_SYMBOL(of_get_next_child);
/**
* of_get_child_by_name - Find the child node by name for a given parent
* @node: parent node
* @name: child name to look for.
*
* This function looks for child node for given matching name
*
* Returns a node pointer if found, with refcount incremented, use
* of_node_put() on it when done.
* Returns NULL if node is not found.
*/
struct device_node *of_get_child_by_name(const struct device_node *node,
const char *name)
{
struct device_node *child;
for_each_child_of_node(node, child)
if (child->name && (of_node_cmp(child->name, name) == 0))
break;
return child;
}
EXPORT_SYMBOL(of_get_child_by_name);
/** /**
* of_find_node_by_path - Find a node matching a full OF path * of_find_node_by_path - Find a node matching a full OF path
* @path: The full path to match * @path: The full path to match

2
include/linux/of.h
View File

@ -190,6 +190,8 @@ extern struct device_node *of_get_parent(const struct device_node *node);
extern struct device_node *of_get_next_parent(struct device_node *node); extern struct device_node *of_get_next_parent(struct device_node *node);
extern struct device_node *of_get_next_child(const struct device_node *node, extern struct device_node *of_get_next_child(const struct device_node *node,
struct device_node *prev); struct device_node *prev);
extern struct device_node *of_get_child_by_name(const struct device_node *node,
const char *name);
#define for_each_child_of_node(parent, child) \ #define for_each_child_of_node(parent, child) \
for (child = of_get_next_child(parent, NULL); child != NULL; \ for (child = of_get_next_child(parent, NULL); child != NULL; \
child = of_get_next_child(parent, child)) child = of_get_next_child(parent, child))