[U-Boot] [PATCH v2 5/9] libfdt: Add iterator over properties

[Maxime Ripard]

Implement a macro based on fdt_first_property_offset and
fdt_next_property_offset that provides a convenience to iterate over all
the properties of a given node.

Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
---
 include/libfdt.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/libfdt.h b/include/libfdt.h
index 74b1d149c2dd..4e8eb9ede3a4 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -441,6 +441,30 @@ int fdt_first_property_offset(const void *fdt, int nodeoffset);
 int fdt_next_property_offset(const void *fdt, int offset);
 
 /**
+ * fdt_for_each_property - iterate over all properties of a node
+ * @fdt:	FDT blob (const void *)
+ * @node:	node offset (int)
+ * @property:	property offset (int)
+ *
+ * This is actually a wrapper around a for loop and would be used like so:
+ *
+ *	fdt_for_each_property(fdt, node, property) {
+ *		...
+ *		use property
+ *		...
+ *	}
+ *
+ * Note that this is implemented as a macro and property is used as
+ * iterator in the loop. It should therefore be a locally allocated
+ * variable. The node variable on the other hand is never modified, so
+ * it can be constant or even a literal.
+ */
+#define fdt_for_each_property(fdt, node, property)		\
+	for (property = fdt_first_property_offset(fdt, node);	\
+	     property >= 0;					\
+	     property = fdt_next_property_offset(fdt, property))
+
+/**
  * fdt_get_property_by_offset - retrieve the property at a given offset
  * @fdt: pointer to the device tree blob
  * @offset: offset of the property to retrieve
-- 
2.8.2