diff --git a/drivers/pinctrl/microchip/pinctrl-mpfs-mssio.c b/drivers/pinctrl/microchip/pinctrl-mpfs-mssio.c
index dafca82f3e54..92d38e5336de 100644
--- a/drivers/pinctrl/microchip/pinctrl-mpfs-mssio.c
+++ b/drivers/pinctrl/microchip/pinctrl-mpfs-mssio.c
@@ -156,10 +156,10 @@ static void mpfs_pinctrl_set_bank_voltage(struct mpfs_pinctrl *pctrl, unsigned i
 	u32 val = FIELD_PREP(MPFS_PINCTRL_BANK_VOLTAGE_MASK, bank_voltage);
 
 	if (pin < MPFS_PINCTRL_BANK2_START)
-		regmap_assign_bits(pctrl->sysreg_regmap, MPFS_PINCTRL_MSSIO_BANK4_CFG_CR,
+		regmap_update_bits(pctrl->sysreg_regmap, MPFS_PINCTRL_MSSIO_BANK4_CFG_CR,
 				   MPFS_PINCTRL_BANK_VOLTAGE_MASK, val);
 	else
-		regmap_assign_bits(pctrl->sysreg_regmap, MPFS_PINCTRL_MSSIO_BANK2_CFG_CR,
+		regmap_update_bits(pctrl->sysreg_regmap, MPFS_PINCTRL_MSSIO_BANK2_CFG_CR,
 				   MPFS_PINCTRL_BANK_VOLTAGE_MASK, val);
 }