request_irq使用示例

#include <linux/irqreturn.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>

static int __init test_init(void)
{
        int err = 0, virq0;
        struct device_node *node;

        node = of_find_compatible_node(NULL,NULL, "test_int");
        if (node) {
                virq0 = irq_of_parse_and_map(node, 0);
                if (virq0 <= 0) {
                        pr_err("ftm: unable to get IRQ from DT, %d\n", virq0);
                        return -EINVAL;
                }

                err = request_irq(virq0, test_handler, IRQF_TRIGGER_RISING, "test0", NULL);
                if (err) {
                        pr_info(" ----warn: rtdm_irq_request failed, err=%d ---\n", err);
                        return err;
                }
        }

        return 0;
}

static void __exit test_exit(void)
{
        free_irq(virq0, NULL);
}


======dts节点
        test: test@000000 {
            compatible = "test_int";
            interrupts = <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>;
        };