If you want to learn about how to implement a complete character driver on a Linux machine, or to find out how several kernel mechanisms work (such as workqueues, completions, and kernel timers, among others) in order to better understand how a generic driver works, then this book is for you.
If you need to know how to write a custom kernel module and how to pass parameters to it, or how to read and better manage kernel messages, or even how to add custom code to the kernel sources, then this book has been written with you in mind.
If you need to better understand a device tree, how to modify it, or even how to write a new device tree in order to meet your requirements and learn how to manage your new device driver, then you will also benefit from this book.
