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irqchip/stm32-exti: Map interrupts through interrupts-extended

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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: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240415134926.1254428-4-antonio.borneo@foss.st.com
This commit is contained in:
Antonio Borneo 2024-04-15 15:49:18 +02:00 committed by Thomas Gleixner
parent e9c17d91e6
commit 77ec258ffa
1 changed files with 21 additions and 0 deletions
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21
drivers/irqchip/irq-stm32-exti.c
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@ -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;