diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c
index 4bc5a08..c59e5c5 100644
--- a/drivers/mfd/tc6393xb.c
+++ b/drivers/mfd/tc6393xb.c
@@ -647,7 +647,7 @@
 	if (ret)
 		goto err_request_scr;
 
-	tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
+	tc6393xb->scr = ioremap(rscr->start, resource_size(rscr));
 	if (!tc6393xb->scr) {
 		ret = -ENOMEM;
 		goto err_ioremap;