While I couldn't find an official PDF version of the book hosted on GitHub, I did find some relevant information:
For modern Linux kernel driver development (kernel 5.x/6.x), consider these : Linux Device Drivers 4th Edition Pdf Github
While a PDF is static and comfortable to read on a tablet, Here is why: While I couldn't find an official PDF version
If you are looking for "LDD4" on GitHub, you are likely finding one of two things: Linux Device Drivers 4th Edition Pdf Github