sh-pfc: r8a7791: add MLB+ pin group

Add MLB+ 3-pin mode pin group to R8A7791 PFC driver.

Based on original patch by Andrey Gusakov <andrey.gusakov@cogentembedded.com>.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sh-pfc/pfc-r8a7791.c

@@ -2391,6 +2391,13 @@ static const unsigned int intc_irq3_pins[] = {
 static const unsigned int intc_irq3_mux[] = {
 	IRQ3_MARK,
 };
+/* - MLB+ ------------------------------------------------------------------- */
+static const unsigned int mlb_3pin_pins[] = {
+	RCAR_GP_PIN(7, 7), RCAR_GP_PIN(7, 8), RCAR_GP_PIN(7, 9),
+};
+static const unsigned int mlb_3pin_mux[] = {
+	MLB_CLK_MARK, MLB_SIG_MARK, MLB_DAT_MARK,
+};
 /* - MMCIF ------------------------------------------------------------------ */
 static const unsigned int mmc_data1_pins[] = {
 	/* D[0] */
@@ -4267,6 +4274,7 @@ static const struct sh_pfc_pin_group pinmux_groups[] = {
 	SH_PFC_PIN_GROUP(intc_irq1),
 	SH_PFC_PIN_GROUP(intc_irq2),
 	SH_PFC_PIN_GROUP(intc_irq3),
+	SH_PFC_PIN_GROUP(mlb_3pin),
 	SH_PFC_PIN_GROUP(mmc_data1),
 	SH_PFC_PIN_GROUP(mmc_data4),
 	SH_PFC_PIN_GROUP(mmc_data8),
@@ -4648,6 +4656,10 @@ static const char * const intc_groups[] = {
 	"intc_irq3",
 };
 
+static const char * const mlb_groups[] = {
+	"mlb_3pin",
+};
+
 static const char * const mmc_groups[] = {
 	"mmc_data1",
 	"mmc_data4",
@@ -4972,6 +4984,7 @@ static const struct sh_pfc_function pinmux_functions[] = {
 	SH_PFC_FUNCTION(i2c7),
 	SH_PFC_FUNCTION(i2c8),
 	SH_PFC_FUNCTION(intc),
+	SH_PFC_FUNCTION(mlb),
 	SH_PFC_FUNCTION(mmc),
 	SH_PFC_FUNCTION(msiof0),
 	SH_PFC_FUNCTION(msiof1),