diff options
Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
| -rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 3908a2154b7f..7d98367d6e83 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1293,7 +1293,19 @@ static int sc16is7xx_probe(struct device *dev, sc16is7xx_power(&s->p[i].port, 0); } - /* Setup interrupt */ + /* + * Setup interrupt. We first try to acquire the IRQ line as level IRQ. + * If that succeeds, we can allow sharing the interrupt as well. + * In case the interrupt controller doesn't support that, we fall + * back to a non-shared falling-edge trigger. + */ + ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_irq, + IRQF_TRIGGER_LOW | IRQF_SHARED | + IRQF_ONESHOT, + dev_name(dev), s); + if (!ret) + return 0; + ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, dev_name(dev), s); |