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5.6.2. Interrupt Handling

irqreturn_t handler(int irq, void *dev_id);

int request_irq(unsigned int irq,
          irq_handler_t handler,
       unsigned long irqflags,
       const char *devname,
       void * dev_id);

int fiddle_with_registers();

5.6.1. Accessing devices 1. Denx Training Topics 5.6.3. Deferring work
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