[PATCH 01/11] of: Add for_each_compatible_node_scoped() helper

[Krzysztof Kozlowski]

Just like looping through children and available children, add a scoped
helper for for_each_compatible_node() so error paths can drop
of_node_put() leading to simpler code.

Suggested-by: Jonathan Cameron <jonathan.cameron at huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>

---

Prerequisite for all further patches.
---
 .clang-format      | 1 +
 include/linux/of.h | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/.clang-format b/.clang-format
index c7060124a47a..1cc151e2adcc 100644
--- a/.clang-format
+++ b/.clang-format
@@ -259,6 +259,7 @@ ForEachMacros:
   - 'for_each_collection'
   - 'for_each_comp_order'
   - 'for_each_compatible_node'
+  - 'for_each_compatible_node_scoped'
   - 'for_each_component_dais'
   - 'for_each_component_dais_safe'
   - 'for_each_conduit'
diff --git a/include/linux/of.h b/include/linux/of.h
index 9bbdcf25a2b4..be6ec4916adf 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1485,6 +1485,13 @@ 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_node_scoped(dn, type, compatible) \
+	for (struct device_node *dn __free(device_node) =		\
+	     of_find_compatible_node(NULL, 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))

-- 
2.51.0