[PATCH] pinctrl: renesas: rzg2l: Configure interrupt input mode

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxx>
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index c7c6d912a975..5233e4531d80 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -1580,6 +1580,26 @@ 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];
+	u32 *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,
@@ -1589,11 +1609,16 @@ 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->data);
 	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);
-- 
2.25.1