diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index ecfe15122091..b157a680e940 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -101,6 +101,9 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
 		}
 	}
 
+	/*For PREEMPT_RT: avoid scheduler preemption during fast register ops*/
+	syscon_config.use_raw_spinlock = true;
+
 	syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%pa", np, &res.start);
 	if (!syscon_config.name) {
 		ret = -ENOMEM;
@@ -302,6 +305,10 @@ static int syscon_probe(struct platform_device *pdev)
 	syscon_config.max_register = resource_size(res) - 4;
 	if (pdata)
 		syscon_config.name = pdata->label;
+
+	/*For PREEMPT_RT: avoid scheduler preemption during fast register ops*/
+	syscon_config.use_raw_spinlock = true;
+
 	syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);
 	if (IS_ERR(syscon->regmap)) {
 		dev_err(dev, "regmap init failed\n");