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authorGrant Likely <grant.likely@secretlab.ca>2009-04-25 12:52:40 +0000
committerDavid S. Miller <davem@davemloft.net>2009-04-27 02:53:45 -0700
commit739649c53d7f78f5bf41bdfd1a858ee90c7a687a (patch)
tree0e11496435be0cab44c7eaab37964a7c74bd3187
parentedf391ff17232f097d72441c9ad467bcb3b5db18 (diff)
downloadop-kernel-dev-739649c53d7f78f5bf41bdfd1a858ee90c7a687a.zip
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of: add of_parse_phandle() helper for parsing phandle properties
of_parse_phandle() is a helper function to read and parse a phandle property and return a pointer to the resulting device_node. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/of/base.c24
-rw-r--r--include/linux/of.h3
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 41c5dfd..ddf224d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -495,6 +495,30 @@ int of_modalias_node(struct device_node *node, char *modalias, int len)
EXPORT_SYMBOL_GPL(of_modalias_node);
/**
+ * of_parse_phandle - Resolve a phandle property to a device_node pointer
+ * @np: Pointer to device node holding phandle property
+ * @phandle_name: Name of property holding a phandle value
+ * @index: For properties holding a table of phandles, this is the index into
+ * the table
+ *
+ * Returns the device_node pointer with refcount incremented. Use
+ * of_node_put() on it when done.
+ */
+struct device_node *
+of_parse_phandle(struct device_node *np, const char *phandle_name, int index)
+{
+ const phandle *phandle;
+ int size;
+
+ phandle = of_get_property(np, phandle_name, &size);
+ if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))
+ return NULL;
+
+ return of_find_node_by_phandle(phandle[index]);
+}
+EXPORT_SYMBOL(of_parse_phandle);
+
+/**
* of_parse_phandles_with_args - Find a node pointed by phandle in a list
* @np: pointer to a device tree node containing a list
* @list_name: property name that contains a list
diff --git a/include/linux/of.h b/include/linux/of.h
index 6a7efa2..7be2d10 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -77,6 +77,9 @@ extern int of_n_size_cells(struct device_node *np);
extern const struct of_device_id *of_match_node(
const struct of_device_id *matches, const struct device_node *node);
extern int of_modalias_node(struct device_node *node, char *modalias, int len);
+extern struct device_node *of_parse_phandle(struct device_node *np,
+ const char *phandle_name,
+ int index);
extern int of_parse_phandles_with_args(struct device_node *np,
const char *list_name, const char *cells_name, int index,
struct device_node **out_node, const void **out_args);
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