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path: root/drivers/of/of_reserved_mem.c
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Diffstat (limited to 'drivers/of/of_reserved_mem.c')
-rw-r--r--drivers/of/of_reserved_mem.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 32771c2ced7b..22b75c82e377 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -397,3 +397,29 @@ void of_reserved_mem_device_release(struct device *dev)
rmem->ops->device_release(rmem, dev);
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
+
+/**
+ * of_reserved_mem_lookup() - acquire reserved_mem from a device node
+ * @np: node pointer of the desired reserved-memory region
+ *
+ * This function allows drivers to acquire a reference to the reserved_mem
+ * struct based on a device node handle.
+ *
+ * Returns a reserved_mem reference, or NULL on error.
+ */
+struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
+{
+ const char *name;
+ int i;
+
+ if (!np->full_name)
+ return NULL;
+
+ name = kbasename(np->full_name);
+ for (i = 0; i < reserved_mem_count; i++)
+ if (!strcmp(reserved_mem[i].name, name))
+ return &reserved_mem[i];
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);