Hi NXP's engineers,
Based on imx6sx platform, we created a wiegand port device, and when we try open this device, it occationally report the gpio irq allocated error like this :
root@falcon-4866:/dev# cat wiegand_port3
[ 1197.666490] gpio gpiochip5: (20b0000.gpio): gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
[ 1197.676488] gpio-mxc 20b0000.gpio: unable to lock HW IRQ 8 for IRQ
[ 1197.688323] genirq: Failed to request resources for wiegand-gpio (irq 236) on irqchip gpio-mxc
[ 1197.697075] wiegand-gpio wiegand_port3: D0 IRQ 236 not allocated
cat: wiegand_port3: Input/output error
root@falcon-4866:/dev#
the related code is here:
/* Attach the interrupt handlers */
if (0 > request_irq(port->irq_number_d0,
(irq_handler_t)irq_handler_d0,
TRIGGER_EDGE,
DRIVER_NAME,
port))
{
dev_err (port->parent, "D0 IRQ %d not allocated\n", port->irq_number_d0);
spin_lock (&port->port_open_lock);
port->port_open = false;
spin_unlock (&port->port_open_lock);
return -EIO;
}
when the wiegand device call the open function, and try to allocate gpio irq, it sometimes report the irq allocation error.
Have you ever met this kind of issuss ?
thanks.
