ARM-Linux s3c2440 UART Analysis (Part 4)-EEWORLD

Collect

After registration is complete, how are the device and driver connected? It turns out that the device connection has been made during driver_register() registration.

The serial port is a platform device. The device registration is completed in the system framework setup_arch(), and the device registration precedes the driver registration. Finally, the connection between the serial port device and the driver is completed in driver_register() --> bus_add_driver().

int bus_add_driver(struct device_driver *drv)
{
enter;
structdevice_driver *other;
…
if(drv->bus->p->drivers_autoprobe) { //platfrom_but_type == 1 automatically detects platfrom device
error= driver_attach(drv);
if(error)
goto out_unregister;
}
….
}

Finally, driver_attach()-->bus_for_each_dev() completes the connection between the serial port device and the driver

int bus_for_each_dev(struct bus_type *bus,struct device *start,
void *data, int (*fn)(struct device *,void *))
{
structklist_iter i;
structdevice *dev;
interror = 0;
if(!bus)
return-SINGLE SELECT;
klist_iter_init_node(&bus->p->klist_devices,&i,
(start ? &start->p->knode_bus :NULL));
while((dev = next_device(&i)) && !error) //Traverse all corresponding devices
error= fn(dev, data);
klist_iter_exit(&i);
return error;
}

Keywords：ARM Linux s3c2440 UART Reference address：ARM-Linux s3c2440 UART Analysis (Part 4)

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