This commit introduces retrigger support for stm32_ext_h chip.
It consists to rise the GIC interrupt mapped to an EXTI line.

Signed-off-by: Alexandre Torgue <redacted>

diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index e00f2fa27f00..c971d115edb4 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c

@@ -604,12 +604,24 @@ static void stm32_exti_h_syscore_deinit(void)
  	unregister_syscore_ops(&stm32_exti_h_syscore_ops);
  }
  
+static int stm32_exti_h_retrigger(struct irq_data *d)
+{
+	struct stm32_exti_chip_data *chip_data = irq_data_get_irq_chip_data(d);
+	const struct stm32_exti_bank *stm32_bank = chip_data->reg_bank;
+	void __iomem *base = chip_data->host_data->base;
+	u32 mask = BIT(d->hwirq % IRQS_PER_BANK);
+
+	writel_relaxed(mask, base + stm32_bank->swier_ofst);
+
+	return irq_chip_retrigger_hierarchy(d);
+}
+
  static struct irq_chip stm32_exti_h_chip = {
  	.name			= "stm32-exti-h",
  	.irq_eoi		= stm32_exti_h_eoi,
  	.irq_mask		= stm32_exti_h_mask,
  	.irq_unmask		= stm32_exti_h_unmask,
-	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.irq_retrigger		= stm32_exti_h_retrigger,
  	.irq_set_type		= stm32_exti_h_set_type,
  	.irq_set_wake		= stm32_exti_h_set_wake,
  	.flags			= IRQCHIP_MASK_ON_SUSPEND,