diff --git a/drivers/pinctrl/renesas/pfc-r8a779g0.c b/drivers/pinctrl/renesas/pfc-r8a779g0.c
index 8a2dc7e9498c..8661cd5a2a38 100644
--- a/drivers/pinctrl/renesas/pfc-r8a779g0.c
+++ b/drivers/pinctrl/renesas/pfc-r8a779g0.c
@@ -302,13 +302,13 @@
 #define IP0SR1_15_12	FM(MSIOF1_SCK)		FM(HSCK3_A)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 #define IP0SR1_19_16	FM(MSIOF1_TXD)		FM(HRX3_A)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 #define IP0SR1_23_20	FM(MSIOF1_RXD)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
-#define IP0SR1_27_24	FM(MSIOF0_SS2)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
-#define IP0SR1_31_28	FM(MSIOF0_SS1)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
+#define IP0SR1_27_24	FM(MSIOF0_SS2)		FM(HTX1_X)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
+#define IP0SR1_31_28	FM(MSIOF0_SS1)		FM(HRX1_X)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 
 /* IP1SR1 */		/* 0 */			/* 1 */			/* 2 */		/* 3		4	 5	  6	   7	    8	     9	      A	       B	C	 D	  E	   F */
-#define IP1SR1_3_0	FM(MSIOF0_SYNC)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
-#define IP1SR1_7_4	FM(MSIOF0_TXD)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
-#define IP1SR1_11_8	FM(MSIOF0_SCK)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
+#define IP1SR1_3_0	FM(MSIOF0_SYNC)		FM(HCTS1_N_X)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
+#define IP1SR1_7_4	FM(MSIOF0_TXD)		FM(HRTS1_N_X)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
+#define IP1SR1_11_8	FM(MSIOF0_SCK)		FM(HSCK1_X)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 #define IP1SR1_15_12	FM(MSIOF0_RXD)		F_(0, 0)		F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 #define IP1SR1_19_16	FM(HTX0)		FM(TX0)			F_(0, 0)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
 #define IP1SR1_23_20	FM(HCTS0_N)		FM(CTS0_N)		FM(PWM8)	F_(0, 0)	F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0) F_(0, 0)
@@ -810,15 +810,22 @@ static const u16 pinmux_data[] = {
 	PINMUX_IPSR_GPSR(IP0SR1_19_16,	HRX3_A),
 
 	PINMUX_IPSR_GPSR(IP0SR1_23_20,	MSIOF1_RXD),
+
 	PINMUX_IPSR_GPSR(IP0SR1_27_24,	MSIOF0_SS2),
+	PINMUX_IPSR_GPSR(IP0SR1_27_24,	HTX1_X),
+
 	PINMUX_IPSR_GPSR(IP0SR1_31_28,	MSIOF0_SS1),
+	PINMUX_IPSR_GPSR(IP0SR1_31_28,	HRX1_X),
 
 	/* IP1SR1 */
 	PINMUX_IPSR_GPSR(IP1SR1_3_0,	MSIOF0_SYNC),
+	PINMUX_IPSR_GPSR(IP1SR1_3_0,	HCTS1_N_X),
 
 	PINMUX_IPSR_GPSR(IP1SR1_7_4,	MSIOF0_TXD),
+	PINMUX_IPSR_GPSR(IP1SR1_7_4,	HRTS1_N_X),
 
 	PINMUX_IPSR_GPSR(IP1SR1_11_8,	MSIOF0_SCK),
+	PINMUX_IPSR_GPSR(IP1SR1_11_8,	HSCK1_X),
 
 	PINMUX_IPSR_GPSR(IP1SR1_15_12,	MSIOF0_RXD),
 
@@ -1525,6 +1532,29 @@ static const unsigned int hscif1_ctrl_mux[] = {
 	HRTS1_N_MARK, HCTS1_N_MARK,
 };
 
+/* - HSCIF1_X---------------------------------------------------------------- */
+static const unsigned int hscif1_data_x_pins[] = {
+	/* HRX1_X, HTX1_X */
+	RCAR_GP_PIN(1, 7), RCAR_GP_PIN(1, 6),
+};
+static const unsigned int hscif1_data_x_mux[] = {
+	HRX1_X_MARK, HTX1_X_MARK,
+};
+static const unsigned int hscif1_clk_x_pins[] = {
+	/* HSCK1_X */
+	RCAR_GP_PIN(1, 10),
+};
+static const unsigned int hscif1_clk_x_mux[] = {
+	HSCK1_X_MARK,
+};
+static const unsigned int hscif1_ctrl_x_pins[] = {
+	/* HRTS1_N_X, HCTS1_N_X */
+	RCAR_GP_PIN(1, 9), RCAR_GP_PIN(1, 8),
+};
+static const unsigned int hscif1_ctrl_x_mux[] = {
+	HRTS1_N_X_MARK, HCTS1_N_X_MARK,
+};
+
 /* - HSCIF2 ----------------------------------------------------------------- */
 static const unsigned int hscif2_data_pins[] = {
 	/* HRX2, HTX2 */
@@ -2346,9 +2376,12 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(hscif0_data),
 	SH_PFC_PIN_GROUP(hscif0_clk),
 	SH_PFC_PIN_GROUP(hscif0_ctrl),
-	SH_PFC_PIN_GROUP(hscif1_data),
-	SH_PFC_PIN_GROUP(hscif1_clk),
-	SH_PFC_PIN_GROUP(hscif1_ctrl),
+	SH_PFC_PIN_GROUP(hscif1_data),		/* suffix might be updated */
+	SH_PFC_PIN_GROUP(hscif1_data_x),	/* suffix might be updated */
+	SH_PFC_PIN_GROUP(hscif1_clk),		/* suffix might be updated */
+	SH_PFC_PIN_GROUP(hscif1_clk_x),		/* suffix might be updated */
+	SH_PFC_PIN_GROUP(hscif1_ctrl),		/* suffix might be updated */
+	SH_PFC_PIN_GROUP(hscif1_ctrl_x),	/* suffix might be updated */
 	SH_PFC_PIN_GROUP(hscif2_data),
 	SH_PFC_PIN_GROUP(hscif2_clk),
 	SH_PFC_PIN_GROUP(hscif2_ctrl),
@@ -2545,9 +2578,13 @@ static const char * const hscif0_groups[] = {
 };
 
 static const char * const hscif1_groups[] = {
+	/* suffix might be updated */
 	"hscif1_data",
+	"hscif1_data_x",
 	"hscif1_clk",
+	"hscif1_clk_x",
 	"hscif1_ctrl",
+	"hscif1_ctrl_x",
 };
 
 static const char * const hscif2_groups[] = {
