世界杯预选赛亚洲区_高达世界杯 - fzxzyy.com

CHAINED GPIO irqchips: these are usually the type that is embedded on

an SoC. This means that there is a fast IRQ handler for the GPIOs that

gets called in a chain from the parent IRQ handler, most typically the

system interrupt controller. This means the GPIO irqchip is registered

using irq_set_chained_handler() or the corresponding

gpiochip_set_chained_irqchip() helper function, and the GPIO irqchip

handler will be called immediately from the parent irqchip, while

holding the IRQs disabled. The GPIO irqchip will then end up calling

something like this sequence in its interrupt handler:

static irqreturn_t tc3589x_gpio_irq(int irq, void *data)

chained_irq_enter(...);

generic_handle_irq(...);

chained_irq_exit(...);