diff --git a/drivers/timer/ast_timer.c b/drivers/timer/ast_timer.c
index 3838601..9f28cbf 100644
--- a/drivers/timer/ast_timer.c
+++ b/drivers/timer/ast_timer.c
@@ -65,8 +65,8 @@
 	struct ast_timer_priv *priv = dev_get_priv(dev);
 
 	priv->regs = devfdt_get_addr_ptr(dev);
-	if (IS_ERR(priv->regs))
-		return PTR_ERR(priv->regs);
+	if (!priv->regs)
+		return -EINVAL;
 
 	priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);