pinctrl: renesas: rzg2l: Add function pointers for OEN register access

Introduce function pointers oen_read() and oen_write(), in the struct
rzg2l_pinctrl_data to facilitate reading and writing to the PFC_OEN
register.  On the RZ/V2H(P) SoC, unlocking the PWPR.REGWE_B bit before
writing to the PFC_OEN register is necessary, and the PFC_OEN register
has more bits compared to the RZ/G2L family.  To handle these
differences between RZ/G2L and RZ/V2H(P) and to reuse the existing code
for RZ/V2H(P), these function pointers are introduced.

Additionally, populate these function pointers with appropriate data for
existing SoCs.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> # on RZ/G3S
Link: https://lore.kernel.org/r/20240530173857.164073-10-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Author: prabhakarlad

drivers/pinctrl/renesas/pinctrl-rzg2l.c

@@ -255,6 +255,8 @@ struct rzg2l_pinctrl_data {
 	unsigned int n_variable_pin_cfg;
 	void (*pwpr_pfc_lock_unlock)(struct rzg2l_pinctrl *pctrl, bool lock);
 	void (*pmc_writeb)(struct rzg2l_pinctrl *pctrl, u8 val, u16 offset);
+	u32 (*oen_read)(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin);
+	int (*oen_write)(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin, u8 oen);
 };
 
 /**
@@ -1035,7 +1037,7 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 		break;
 
 	case PIN_CONFIG_OUTPUT_ENABLE:
-		arg = rzg2l_read_oen(pctrl, cfg, _pin, bit);
+		arg = pctrl->data->oen_read(pctrl, cfg, _pin, bit);
 		if (!arg)
 			return -EINVAL;
 		break;
@@ -1144,7 +1146,7 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
 
 		case PIN_CONFIG_OUTPUT_ENABLE:
 			arg = pinconf_to_config_argument(_configs[i]);
-			ret = rzg2l_write_oen(pctrl, cfg, _pin, bit, !!arg);
+			ret = pctrl->data->oen_write(pctrl, cfg, _pin, bit, !!arg);
 			if (ret)
 				return ret;
 			break;
@@ -2623,6 +2625,8 @@ static struct rzg2l_pinctrl_data r9a07g043_data = {
 #endif
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
+	.oen_read = &rzg2l_read_oen,
+	.oen_write = &rzg2l_write_oen,
 };
 
 static struct rzg2l_pinctrl_data r9a07g044_data = {
@@ -2636,6 +2640,8 @@ static struct rzg2l_pinctrl_data r9a07g044_data = {
 	.hwcfg = &rzg2l_hwcfg,
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
+	.oen_read = &rzg2l_read_oen,
+	.oen_write = &rzg2l_write_oen,
 };
 
 static struct rzg2l_pinctrl_data r9a08g045_data = {
@@ -2648,6 +2654,8 @@ static struct rzg2l_pinctrl_data r9a08g045_data = {
 	.hwcfg = &rzg3s_hwcfg,
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
+	.oen_read = &rzg2l_read_oen,
+	.oen_write = &rzg2l_write_oen,
 };
 
 static const struct of_device_id rzg2l_pinctrl_of_table[] = {