pinctrl: renesas: rzg2l: Configure interrupt input mode

Configure GPIO interrupt as input mode. Also if the bootloader sets
gpio interrupt pin as function, override it as gpio.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240206135115.151218-2-biju.das.jz@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/renesas/pinctrl-rzg2l.c

@@ -1894,6 +1894,26 @@ static const struct irq_chip rzg2l_gpio_irqchip = {
 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
+static int rzg2l_gpio_interrupt_input_mode(struct gpio_chip *chip, unsigned int offset)
+{
+	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(chip);
+	const struct pinctrl_pin_desc *pin_desc = &pctrl->desc.pins[offset];
+	u64 *pin_data = pin_desc->drv_data;
+	u32 off = RZG2L_PIN_CFG_TO_PORT_OFFSET(*pin_data);
+	u8 bit = RZG2L_PIN_ID_TO_PIN(offset);
+	u8 reg8;
+	int ret;
+
+	reg8 = readb(pctrl->base + PMC(off));
+	if (reg8 & BIT(bit)) {
+		ret = rzg2l_gpio_request(chip, offset);
+		if (ret)
+			return ret;
+	}
+
+	return rzg2l_gpio_direction_input(chip, offset);
+}
+
 static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 					    unsigned int child,
 					    unsigned int child_type,
@@ -1903,16 +1923,24 @@ static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 	struct rzg2l_pinctrl *pctrl = gpiochip_get_data(gc);
 	unsigned long flags;
 	int gpioint, irq;
+	int ret;
 
 	gpioint = rzg2l_gpio_get_gpioint(child, pctrl);
 	if (gpioint < 0)
 		return gpioint;
 
+	ret = rzg2l_gpio_interrupt_input_mode(gc, child);
+	if (ret)
+		return ret;
+
 	spin_lock_irqsave(&pctrl->bitmap_lock, flags);
 	irq = bitmap_find_free_region(pctrl->tint_slot, RZG2L_TINT_MAX_INTERRUPT, get_order(1));
 	spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);
-	if (irq < 0)
-		return -ENOSPC;
+	if (irq < 0) {
+		ret = -ENOSPC;
+		goto err;
+	}
+
 	pctrl->hwirq[irq] = child;
 	irq += RZG2L_TINT_IRQ_START_INDEX;
 
@@ -1920,6 +1948,10 @@ static int rzg2l_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
 	*parent_type = IRQ_TYPE_LEVEL_HIGH;
 	*parent = RZG2L_PACK_HWIRQ(gpioint, irq);
 	return 0;
+
+err:
+	rzg2l_gpio_free(gc, child);
+	return ret;
 }
 
 static int rzg2l_gpio_populate_parent_fwspec(struct gpio_chip *chip,
@@ -1952,6 +1984,7 @@ static void rzg2l_gpio_irq_domain_free(struct irq_domain *domain, unsigned int v
 
 		for (i = 0; i < RZG2L_TINT_MAX_INTERRUPT; i++) {
 			if (pctrl->hwirq[i] == hwirq) {
+				rzg2l_gpio_free(gc, hwirq);
 				spin_lock_irqsave(&pctrl->bitmap_lock, flags);
 				bitmap_release_region(pctrl->tint_slot, i, get_order(1));
 				spin_unlock_irqrestore(&pctrl->bitmap_lock, flags);