pinctrl: renesas: r8a779f0: Add PCIe pins, groups, and function

Add pins, groups, and function for the PCIe Controllers on the Renesas
R-Car S4-8 (R8A779F0) SoC.

Extracted from a larger patch in the BSP by LUU HOAI.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/b2f95db490d13e8cb7d97a63d58d47933317e28a.1645457792.git.geert+renesas@glider.be

drivers/pinctrl/renesas/pfc-r8a779f0.c

@@ -898,6 +898,25 @@ static const unsigned int msiof3_rxd_mux[] = {
 	MSIOF3_RXD_MARK,
 };
 
+/* - PCIE ------------------------------------------------------------------- */
+static const unsigned int pcie0_clkreq_n_pins[] = {
+	/* PCIE0_CLKREQ# */
+	RCAR_GP_PIN(2, 15),
+};
+
+static const unsigned int pcie0_clkreq_n_mux[] = {
+	PCIE0_CLKREQ_N_MARK,
+};
+
+static const unsigned int pcie1_clkreq_n_pins[] = {
+	/* PCIE1_CLKREQ# */
+	RCAR_GP_PIN(2, 16),
+};
+
+static const unsigned int pcie1_clkreq_n_mux[] = {
+	PCIE1_CLKREQ_N_MARK,
+};
+
 /* - SCIF0 ------------------------------------------------------------------ */
 static const unsigned int scif0_data_pins[] = {
 	/* RX0, TX0 */
@@ -1055,6 +1074,8 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(msiof3_ss2),
 	SH_PFC_PIN_GROUP(msiof3_txd),
 	SH_PFC_PIN_GROUP(msiof3_rxd),
+	SH_PFC_PIN_GROUP(pcie0_clkreq_n),
+	SH_PFC_PIN_GROUP(pcie1_clkreq_n),
 	SH_PFC_PIN_GROUP(scif0_data),
 	SH_PFC_PIN_GROUP(scif0_clk),
 	SH_PFC_PIN_GROUP(scif0_ctrl),
@@ -1173,6 +1194,11 @@ static const char * const msiof3_groups[] = {
 	"msiof3_rxd",
 };
 
+static const char * const pcie_groups[] = {
+	"pcie0_clkreq_n",
+	"pcie1_clkreq_n",
+};
+
 static const char * const scif0_groups[] = {
 	"scif0_data",
 	"scif0_clk",
@@ -1218,6 +1244,7 @@ static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(msiof1),
 	SH_PFC_FUNCTION(msiof2),
 	SH_PFC_FUNCTION(msiof3),
+	SH_PFC_FUNCTION(pcie),
 	SH_PFC_FUNCTION(scif0),
 	SH_PFC_FUNCTION(scif1),
 	SH_PFC_FUNCTION(scif3),