diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 6805fe2..ac312d6 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -457,8 +457,8 @@
 
 		na = of_n_addr_cells(np);
 		ns = of_n_addr_cells(np);
-		*sizep = fdt_read_number(prop + na, ns);
-		return fdt_read_number(prop, na);
+		*sizep = of_read_number(prop + na, ns);
+		return of_read_number(prop, na);
 	} else {
 		return fdtdec_get_addr_size(gd->fdt_blob,
 					    ofnode_to_offset(node), property,
diff --git a/include/dm/of.h b/include/dm/of.h
index 6b5afab..d4d941e 100644
--- a/include/dm/of.h
+++ b/include/dm/of.h
@@ -103,4 +103,40 @@
 }
 #endif
 
+#define OF_BAD_ADDR	((u64)-1)
+
+static inline const char *of_node_full_name(const struct device_node *np)
+{
+	return np ? np->full_name : "<no-node>";
+}
+
+/* Default #address and #size cells */
+#if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
+#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
+#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
+#endif
+
+/* Default string compare functions */
+#if !defined(of_compat_cmp)
+#define of_compat_cmp(s1, s2, l)	strcasecmp((s1), (s2))
+#define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
+#define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
+#endif
+
+/* Helper to read a big number; size is in cells (not bytes) */
+static inline u64 of_read_number(const __be32 *cell, int size)
+{
+	u64 r = 0;
+	while (size--)
+		r = (r << 32) | be32_to_cpu(*(cell++));
+	return r;
+}
+
+/* Like of_read_number, but we want an unsigned long result */
+static inline unsigned long of_read_ulong(const __be32 *cell, int size)
+{
+	/* toss away upper bits if unsigned long is smaller than u64 */
+	return of_read_number(cell, size);
+}
+
 #endif