diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index be6240984002..f64e46fcf0be 100644
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -710,7 +710,6 @@ static const struct regmap_config armada_thermal_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
-	.fast_io = true,
 };
 
 static int armada_thermal_probe_legacy(struct platform_device *pdev,
diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
index 22674790629a..284684137c43 100644
--- a/drivers/thermal/sun8i_thermal.c
+++ b/drivers/thermal/sun8i_thermal.c
@@ -149,7 +149,6 @@ static const struct regmap_config config = {
 	.reg_bits = 32,
 	.val_bits = 32,
 	.reg_stride = 4,
-	.fast_io = true,
 	.max_register = 0xfc,
 };