pinctrl: mediatek: mt7981: add additional emmc groups

Add new emmc groups in the pinctrl driver for the
MediaTek MT7981 SoC:
* emmc reset, with pin 15.
* emmc 4-bit bus-width, with pins 16 to 19, and 24 to 25.
* emmc 8-bit bus-width, with pins 16 to 25.

The existing emmc_45 group is kept for legacy reasons, even
if this is the union of emmc_reset and emmc_8 groups.
Signed-off-by: Jean Thomas <jean.thomas@wifirst.fr>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/20240117145547.3354242-1-jean.thomas@wifirst.frSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/mediatek/pinctrl-mt7981.c

@@ -700,6 +700,15 @@ static int mt7981_drv_vbus_pins[] = { 14, };
 static int mt7981_drv_vbus_funcs[] = { 1, };
 
 /* EMMC */
+static int mt7981_emmc_reset_pins[] = { 15, };
+static int mt7981_emmc_reset_funcs[] = { 2, };
+
+static int mt7981_emmc_4_pins[] = { 16, 17, 18, 19, 24, 25, };
+static int mt7981_emmc_4_funcs[] = { 2, 2, 2, 2, 2, 2, };
+
+static int mt7981_emmc_8_pins[] = { 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, };
+static int mt7981_emmc_8_funcs[] = { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, };
+
 static int mt7981_emmc_45_pins[] = { 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, };
 static int mt7981_emmc_45_funcs[] = { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, };
 
@@ -854,6 +863,12 @@ static const struct group_desc mt7981_groups[] = {
 	PINCTRL_PIN_GROUP("udi", mt7981_udi),
 	/* @GPIO(14) DRV_VBUS(1) */
 	PINCTRL_PIN_GROUP("drv_vbus", mt7981_drv_vbus),
+	/* @GPIO(15): EMMC_RSTB(2) */
+	PINCTRL_PIN_GROUP("emmc_reset", mt7981_emmc_reset),
+	/* @GPIO(16,17,18,19,24,25): EMMC_DATx, EMMC_CLK, EMMC_CMD */
+	PINCTRL_PIN_GROUP("emmc_4", mt7981_emmc_4),
+	/* @GPIO(16,17,18,19,20,21,22,23,24,25): EMMC_DATx, EMMC_CLK, EMMC_CMD */
+	PINCTRL_PIN_GROUP("emmc_8", mt7981_emmc_8),
 	/* @GPIO(15,25): EMMC(2) */
 	PINCTRL_PIN_GROUP("emmc_45", mt7981_emmc_45),
 	/* @GPIO(16,21): SNFI(3) */
@@ -957,7 +972,7 @@ static const char *mt7981_i2c_groups[] = { "i2c0_0", "i2c0_1", "u2_phy_i2c",
 static const char *mt7981_pcm_groups[] = { "pcm", };
 static const char *mt7981_udi_groups[] = { "udi", };
 static const char *mt7981_usb_groups[] = { "drv_vbus", };
-static const char *mt7981_flash_groups[] = { "emmc_45", "snfi", };
+static const char *mt7981_flash_groups[] = { "emmc_reset", "emmc_4", "emmc_8", "emmc_45", "snfi", };
 static const char *mt7981_ethernet_groups[] = { "smi_mdc_mdio", "gbe_ext_mdc_mdio",
 	"wf0_mode1", "wf0_mode3", "mt7531_int", };
 static const char *mt7981_ant_groups[] = { "ant_sel", };