diff --git a/drivers/char/tpm/tpm_atmel.h b/drivers/char/tpm/tpm_atmel.h
index aefd683..3501c03 100644
--- a/drivers/char/tpm/tpm_atmel.h
+++ b/drivers/char/tpm/tpm_atmel.h
@@ -53,7 +53,7 @@
 	}
 
 	reg = get_property(dn, "reg", &reglen);
-	naddrc = prom_n_addr_cells(dn);
+	naddrc = of_n_addr_cells(dn);
 	nsizec = prom_n_size_cells(dn);
 
 	of_node_put(dn);