diff --git a/arch/microblaze/include/asm/prom.h b/arch/microblaze/include/asm/prom.h
index 6c6b386..ddc5c57 100644
--- a/arch/microblaze/include/asm/prom.h
+++ b/arch/microblaze/include/asm/prom.h
@@ -26,13 +26,6 @@
 #include <asm/irq.h>
 #include <asm/atomic.h>
 
-#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT	1
-#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT	1
-
-#define of_compat_cmp(s1, s2, l)	strncasecmp((s1), (s2), (l))
-#define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
-#define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
-
 extern struct device_node *of_chosen;
 
 #define HAVE_ARCH_DEVTREE_FIXUPS
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index f384db8..4a5070e 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -23,13 +23,6 @@
 #include <asm/irq.h>
 #include <asm/atomic.h>
 
-#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT	1
-#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT	1
-
-#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))
-
 extern struct device_node *of_chosen;
 
 #define HAVE_ARCH_DEVTREE_FIXUPS
diff --git a/include/linux/of.h b/include/linux/of.h
index 48b0ee6..5cd2840 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -116,6 +116,19 @@
 
 #include <asm/prom.h>
 
+/* Default #address and #size cells.  Allow arch asm/prom.h to override */
+#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, Allow arch asm/prom.h to override */
+#if !defined(of_compat_cmp)
+#define of_compat_cmp(s1, s2, l)	strncasecmp((s1), (s2), (l))
+#define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
+#define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
+#endif
+
 /* flag descriptions */
 #define OF_DYNAMIC	1 /* node and properties were allocated via kmalloc */
 #define OF_DETACHED	2 /* node has been detached from the device tree */