pinctrl: renesas: rzg2l: Add support for enabling/disabling open-drain outputs

Add support for enabling and disabling open-drain outputs.

Signed-off-by: Lad Prabhakar <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Tested-by: Claudiu Beznea <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

Author: prabhakarlad

drivers/pinctrl/renesas/pinctrl-rzg2l.c

@@ -139,6 +139,7 @@
 #define IEN(off)		(0x1800 + (off) * 8)
 #define PUPD(off)		(0x1C00 + (off) * 8)
 #define ISEL(off)		(0x2C00 + (off) * 8)
+#define NOD(off)		(0x3000 + (off) * 8)
 #define SD_CH(off, ch)		((off) + (ch) * 4)
 #define ETH_POC(off, ch)	((off) + (ch) * 4)
 #define QSPI			(0x3008)
@@ -160,6 +161,7 @@
 #define IOLH_MASK		0x03
 #define SR_MASK			0x01
 #define PUPD_MASK		0x03
+#define NOD_MASK		0x01
 
 #define PM_INPUT		0x1
 #define PM_OUTPUT		0x2
@@ -1338,6 +1340,18 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 		break;
 	}
 
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+		if (!(cfg & PIN_CFG_NOD))
+			return -EINVAL;
+
+		arg = rzg2l_read_pin_config(pctrl, NOD(off), bit, NOD_MASK);
+		if (!arg && param != PIN_CONFIG_DRIVE_PUSH_PULL)
+			return -EINVAL;
+		if (arg && param != PIN_CONFIG_DRIVE_OPEN_DRAIN)
+			return -EINVAL;
+		break;
+
 	case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
 		if (!(cfg & PIN_CFG_IOLH_RZV2H))
 			return -EINVAL;
@@ -1467,6 +1481,15 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
 			rzg2l_rmw_pin_config(pctrl, IOLH(off), bit, IOLH_MASK, index);
 			break;
 
+		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		case PIN_CONFIG_DRIVE_PUSH_PULL:
+			if (!(cfg & PIN_CFG_NOD))
+				return -EINVAL;
+
+			rzg2l_rmw_pin_config(pctrl, NOD(off), bit, NOD_MASK,
+					     param == PIN_CONFIG_DRIVE_OPEN_DRAIN ? 1 : 0);
+			break;
+
 		case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
 			if (!(cfg & PIN_CFG_IOLH_RZV2H))
 				return -EINVAL;