Hi Abhinav, On Mon, Jun 25, 2018 at 12:17 AM, Abhinav Misra <abhitheextremeeng@xxxxxxxxx> wrote: > Hi Guys, > > I want to know how the irq number is derived in linux kernel. > In kernel we are using below function for registering ISR. > For platform drivers, usually this information comes from the device tree entry. which you get originally from the System On chip HW interface documents or from specification sheets. > int request_threaded_irq(unsigned int irq, irq_handler_t handler, > irq_handler_t thread_fn, unsigned long irqflags, const char *devname, void > *dev_id) > > 1st arg is irq number. Now suppose for an i2c device, want to configure an > interrupt then we can enable interrupt by configuring the particular > register > but from where we will get the irq number details. In kernel drivers, DT entries of that driver are read by some APIs and then used by request_irq > > Do we as a programmer need to map it ? > > Please provide your views. > > BR,Abhinav > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
