Commit 77ec258f authored by Antonio Borneo's avatar Antonio Borneo Committed by Thomas Gleixner
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irqchip/stm32-exti: Map interrupts through interrupts-extended 



The mapping of EXTI events to its parent interrupt controller is both SoC
and instance dependent.

The current implementation requires adding a new mapping table to the
driver's code and a new compatible for each new EXTI instance.

Check for the presence of the optional interrupts-extended property and use
it to map EXTI events to the parent's interrupts.

For old device trees without the optional interrupts-extended property, the
driver's behavior is unchanged, thus keeps backward compatibility.

Signed-off-by: default avatarAntonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240415134926.1254428-4-antonio.borneo@foss.st.com
parent e9c17d91

drivers/irqchip/irq-stm32-exti.c

+21 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct stm32_exti_host_data { 
	struct stm32_exti_chip_data *chips_data;

	const struct stm32_exti_drv_data *drv_data;

	struct hwspinlock *hwlock;

	bool dt_has_irqs_desc; /* skip internal desc_irqs array and get it from DT */

};



static struct stm32_exti_host_data *stm32_host_data;
@@ -731,6 +732,23 @@ static int stm32_exti_h_domain_alloc(struct irq_domain *dm, 


	irq_domain_set_hwirq_and_chip(dm, virq, hwirq, chip, chip_data);



	if (host_data->dt_has_irqs_desc) {

		struct of_phandle_args out_irq;

		int ret;



		ret = of_irq_parse_one(host_data->dev->of_node, hwirq, &out_irq);

		if (ret)

			return ret;

		/* we only support one parent, so far */

		if (of_node_to_fwnode(out_irq.np) != dm->parent->fwnode)

			return -EINVAL;



		of_phandle_args_to_fwspec(out_irq.np, out_irq.args,

					  out_irq.args_count, &p_fwspec);



		return irq_domain_alloc_irqs_parent(dm, virq, 1, &p_fwspec);

	}



	if (!host_data->drv_data->desc_irqs)

		return -EINVAL;
@@ -975,6 +993,9 @@ static int stm32_exti_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	if (of_property_read_bool(np, "interrupts-extended"))

		host_data->dt_has_irqs_desc = true;



	stm32_exti_h_syscore_init(host_data);



	return 0;