diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 00fb91feba70..2f350e3df965 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -4025,7 +4025,9 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) } } - if (test_bit(FLAG_IS_OUT, &desc->flags)) { + /* To be valid for IRQ the line needs to be input or open drain */ + if (test_bit(FLAG_IS_OUT, &desc->flags) && + !test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { chip_err(chip, "%s: tried to flag a GPIO set as output for IRQ\n", __func__); @@ -4088,7 +4090,12 @@ void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) if (!IS_ERR(desc) && !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { - WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags)); + /* + * We must not be output when using IRQ UNLESS we are + * open drain. + */ + WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags) && + !test_bit(FLAG_OPEN_DRAIN, &desc->flags)); set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); } } |