[PATCH 06/11] of: provide for_each_compatible_child_node()

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski at baylibre.com>

Add a variant of for_each_compatible_node() allowing to only iterate
over all compatible nodes that are children of the specified root node.

Signed-off-by: Bartosz Golaszewski <bgolaszewski at baylibre.com>
---
 include/linux/of.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index 4d25e4f952d9..15e0dbf7a602 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1170,6 +1170,9 @@ static inline int of_property_read_s32(const struct device_node *np,
 #define for_each_compatible_node(dn, type, compatible) \
 	for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 	     dn = of_find_compatible_node(dn, type, compatible))
+#define for_each_compatible_child_node(dn, type, compatible, root) \
+	for (dn = of_find_compatible_node(root, type, compatible); dn; \
+	     dn = of_find_compatible_node(dn, type, compatible))
 #define for_each_matching_node(dn, matches) \
 	for (dn = of_find_matching_node(NULL, matches); dn; \
 	     dn = of_find_matching_node(dn, matches))
-- 
2.17.0