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gpiolib: Don't prevent IRQ usage of output GPIOs

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Upstream Linux deems using output GPIOs to generate IRQs as a bogus
use case, even though the BCM2835 GPIO controller is capable of doing
so. A number of users would like to make use of this facility, so
disable the checks.

See: https://github.com/raspberrypi/linux/issues/2527

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2018-04-24 14:42:27 +01:00
committed by popcornmix
parent 6102903cc8
commit b5defd8326
1 changed files with 5 additions and 3 deletions
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8
drivers/gpio/gpiolib.c
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@@ -54,6 +54,8 @@
#define extra_checks 0
#endif
#define dont_test_bit(b,d) (0)
/* Device and char device-related information */
static DEFINE_IDA(gpio_ida);
static dev_t gpio_devt;
@@ -2747,8 +2749,8 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
value = !!value;
/* GPIOs used for enabled IRQs shall not be set as output */
if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
if (dont_test_bit(FLAG_USED_AS_IRQ, &desc->flags) &&
dont_test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) {
gpiod_err(desc,
"%s: tried to set a GPIO tied to an IRQ as output\n",
__func__);
@@ -3528,7 +3530,7 @@ int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
}
}
if (test_bit(FLAG_IS_OUT, &desc->flags)) {
if (dont_test_bit(FLAG_IS_OUT, &desc->flags)) {
chip_err(chip,
"%s: tried to flag a GPIO set as output for IRQ\n",
__func__);