of: introduce of_get_available_child_count

Some drivers keep counting available child by themselves. So
introduce a new simple API like of_get_child_count() but for
available childs.

Cc: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>

diff --git a/include/linux/of.h b/include/linux/of.h
index f95aee3..54c2560 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -226,6 +226,17 @@ static inline int of_get_child_count(const struct device_node *np)
        return num;
 }
 
+static inline int of_get_available_child_count(const struct device_node *np)
+{
+       struct device_node *child;
+       int num = 0;
+
+       for_each_available_child_of_node(np, child)
+               num++;
+
+       return num;
+}
+
 extern struct device_node *of_find_node_with_property(
        struct device_node *from, const char *prop_name);
 #define for_each_node_with_property(dn, prop_name) \
@@ -376,6 +387,11 @@ static inline int of_get_child_count(const struct device_node *np)
        return 0;
 }
 
+static inline int of_get_available_child_count(const struct device_node *np)
+{
+       return 0;
+}
+
 static inline int of_device_is_compatible(const struct device_node *device,
                                          const char *name)
 {