pinctrl: sh-pfc: r8a77970: Add RPC pins, groups, and functions

Add the RPC pins/groups/functions to the R8A77970 PFC driver.
They can be used if an Octal-SPI flash or HyperFlash is connected.

Based on the patch by Dmitry Shifrin <dmitry.shifrin@cogentembedded.com>.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Link: https://lore.kernel.org/r/3982785f-4fca-96f9-2b6a-a0d1828cb0ad@cogentembedded.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/sh-pfc/pfc-r8a77970.c

@@ -1416,6 +1416,64 @@ static const unsigned int qspi1_data4_mux[] = {
 	QSPI1_IO2_MARK, QSPI1_IO3_MARK
 };
 
+/* - RPC -------------------------------------------------------------------- */
+static const unsigned int rpc_clk1_pins[] = {
+	/* Octal-SPI flash: C/SCLK */
+	RCAR_GP_PIN(5, 0),
+};
+static const unsigned int rpc_clk1_mux[] = {
+	QSPI0_SPCLK_MARK,
+};
+static const unsigned int rpc_clk2_pins[] = {
+	/* HyperFlash: CK, CK# */
+	RCAR_GP_PIN(5, 0), RCAR_GP_PIN(5, 6),
+};
+static const unsigned int rpc_clk2_mux[] = {
+	QSPI0_SPCLK_MARK, QSPI1_SPCLK_MARK,
+};
+static const unsigned int rpc_ctrl_pins[] = {
+	/* Octal-SPI flash: S#/CS, DQS */
+	/* HyperFlash: CS#, RDS */
+	RCAR_GP_PIN(5, 5), RCAR_GP_PIN(5, 11),
+};
+static const unsigned int rpc_ctrl_mux[] = {
+	QSPI0_SSL_MARK, QSPI1_SSL_MARK,
+};
+static const unsigned int rpc_data_pins[] = {
+	/* DQ[0:7] */
+	RCAR_GP_PIN(5, 1), RCAR_GP_PIN(5, 2),
+	RCAR_GP_PIN(5, 3), RCAR_GP_PIN(5, 4),
+	RCAR_GP_PIN(5, 7), RCAR_GP_PIN(5, 8),
+	RCAR_GP_PIN(5, 9), RCAR_GP_PIN(5, 10),
+};
+static const unsigned int rpc_data_mux[] = {
+	QSPI0_MOSI_IO0_MARK, QSPI0_MISO_IO1_MARK,
+	QSPI0_IO2_MARK, QSPI0_IO3_MARK,
+	QSPI1_MOSI_IO0_MARK, QSPI1_MISO_IO1_MARK,
+	QSPI1_IO2_MARK, QSPI1_IO3_MARK,
+};
+static const unsigned int rpc_reset_pins[] = {
+	/* RPC_RESET# */
+	RCAR_GP_PIN(5, 12),
+};
+static const unsigned int rpc_reset_mux[] = {
+	RPC_RESET_N_MARK,
+};
+static const unsigned int rpc_int_pins[] = {
+	/* RPC_INT# */
+	RCAR_GP_PIN(5, 14),
+};
+static const unsigned int rpc_int_mux[] = {
+	RPC_INT_N_MARK,
+};
+static const unsigned int rpc_wp_pins[] = {
+	/* RPC_WP# */
+	RCAR_GP_PIN(5, 13),
+};
+static const unsigned int rpc_wp_mux[] = {
+	RPC_WP_N_MARK,
+};
+
 /* - SCIF Clock ------------------------------------------------------------- */
 static const unsigned int scif_clk_a_pins[] = {
 	/* SCIF_CLK */
@@ -1750,6 +1808,13 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(qspi1_ctrl),
 	SH_PFC_PIN_GROUP(qspi1_data2),
 	SH_PFC_PIN_GROUP(qspi1_data4),
+	SH_PFC_PIN_GROUP(rpc_clk1),
+	SH_PFC_PIN_GROUP(rpc_clk2),
+	SH_PFC_PIN_GROUP(rpc_ctrl),
+	SH_PFC_PIN_GROUP(rpc_data),
+	SH_PFC_PIN_GROUP(rpc_reset),
+	SH_PFC_PIN_GROUP(rpc_int),
+	SH_PFC_PIN_GROUP(rpc_wp),
 	SH_PFC_PIN_GROUP(scif_clk_a),
 	SH_PFC_PIN_GROUP(scif_clk_b),
 	SH_PFC_PIN_GROUP(scif0_data),
@@ -1954,6 +2019,16 @@ static const char * const qspi1_groups[] = {
 	"qspi1_data4",
 };
 
+static const char * const rpc_groups[] = {
+	"rpc_clk1",
+	"rpc_clk2",
+	"rpc_ctrl",
+	"rpc_data",
+	"rpc_reset",
+	"rpc_int",
+	"rpc_wp",
+};
+
 static const char * const scif_clk_groups[] = {
 	"scif_clk_a",
 	"scif_clk_b",
@@ -2039,6 +2114,7 @@ static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(pwm4),
 	SH_PFC_FUNCTION(qspi0),
 	SH_PFC_FUNCTION(qspi1),
+	SH_PFC_FUNCTION(rpc),
 	SH_PFC_FUNCTION(scif_clk),
 	SH_PFC_FUNCTION(scif0),
 	SH_PFC_FUNCTION(scif1),