c - Difference between device_register and driver_register

Question

I am writing a UART driver. I came across the two functions in the chapter 14.Linux Device Model.

int device_register(struct device *dev);
int driver_register(struct device_driver *drv);

Since UART is a char driver I have dynamically created the major number using (alloc_chrdev_region) and added the device to kernel by using cdevadd().

I came across uart_register_driver() and platform_driver_register() in omap-serial.c.

I could map the driver_register with the platform_driver_register() but the uart_register_driver is mapped with tty related function.Since I am a beginner i do not want to use the tty related functions.

Is uart_register_driver related with device_driver()?.

Please explain.

Answer 1

driver_register: Adds this driver to the bus' list of drivers.

device_register: Bus' list of drivers is iterated to find the driver that supports this device and then this device is added to the bus' list of devices.