pinctrl: sh-pfc: r8a7795: Add SCIF_CLK support

Add pins, groups, and a function for SCIF_CLK on R-Car H3 ES2.0.
SCIF_CLK is the external clock source for the Baud Rate Generator for
External Clock (BRG) on (H)SCIF serial ports.

Extracted from a big patch in the BSP by Takeshi Kihara.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Takeshi Kihara <takeshi.kihara.df@renesas.com>

drivers/pinctrl/sh-pfc/pfc-r8a7795.c

@@ -1773,6 +1773,22 @@ static const unsigned int scif5_clk_b_mux[] = {
 	SCK5_B_MARK,
 };
 
+/* - SCIF Clock ------------------------------------------------------------- */
+static const unsigned int scif_clk_a_pins[] = {
+	/* SCIF_CLK */
+	RCAR_GP_PIN(6, 23),
+};
+static const unsigned int scif_clk_a_mux[] = {
+	SCIF_CLK_A_MARK,
+};
+static const unsigned int scif_clk_b_pins[] = {
+	/* SCIF_CLK */
+	RCAR_GP_PIN(5, 9),
+};
+static const unsigned int scif_clk_b_mux[] = {
+	SCIF_CLK_B_MARK,
+};
+
 static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(scif0_data),
 	SH_PFC_PIN_GROUP(scif0_clk),
@@ -1801,6 +1817,8 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(scif5_clk_a),
 	SH_PFC_PIN_GROUP(scif5_data_b),
 	SH_PFC_PIN_GROUP(scif5_clk_b),
+	SH_PFC_PIN_GROUP(scif_clk_a),
+	SH_PFC_PIN_GROUP(scif_clk_b),
 };
 
 static const char * const scif0_groups[] = {
@@ -1848,6 +1866,11 @@ static const char * const scif5_groups[] = {
 	"scif5_clk_b",
 };
 
+static const char * const scif_clk_groups[] = {
+	"scif_clk_a",
+	"scif_clk_b",
+};
+
 static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(scif0),
 	SH_PFC_FUNCTION(scif1),
@@ -1855,6 +1878,7 @@ static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(scif3),
 	SH_PFC_FUNCTION(scif4),
 	SH_PFC_FUNCTION(scif5),
+	SH_PFC_FUNCTION(scif_clk),
 };
 
 static const struct pinmux_cfg_reg pinmux_config_regs[] = {