diff --git a/drivers/pinctrl/pinctrl-lpc18xx.c b/drivers/pinctrl/pinctrl-lpc18xx.c
index 190f17e..a14bc5e 100644
--- a/drivers/pinctrl/pinctrl-lpc18xx.c
+++ b/drivers/pinctrl/pinctrl-lpc18xx.c
@@ -844,8 +844,11 @@ static int lpc18xx_pconf_get_pin(struct pinctrl_dev *pctldev, unsigned param,
 		*arg = (reg & LPC18XX_SCU_PIN_EHD_MASK) >> LPC18XX_SCU_PIN_EHD_POS;
 		switch (*arg) {
 		case 3: *arg += 5;
+			/* fall through */
 		case 2: *arg += 5;
+			/* fall through */
 		case 1: *arg += 3;
+			/* fall through */
 		case 0: *arg += 4;
 		}
 		break;
@@ -1060,8 +1063,11 @@ static int lpc18xx_pconf_set_pin(struct pinctrl_dev *pctldev, unsigned param,
 
 		switch (param_val) {
 		case 20: param_val -= 5;
+			 /* fall through */
 		case 14: param_val -= 5;
+			 /* fall through */
 		case  8: param_val -= 3;
+			 /* fall through */
 		case  4: param_val -= 4;
 			 break;
 		default: