Is there a guide for that?
This isn't a snarky RTFM comment. The usage model file in the kernel documentation gives good motivation for what device trees are used for and their basic structure, and the APIs to pull data from them are straightforward enough that you can probably figure them out by looking at an example.
Anyone working with a SOM, for example, will want to customize the DT for their carrier board. And then your EE finds a cheaper controller chip somewhere. And then your display supplier switches captouch parts on you mid-production.
Sorry, was I venting there?
(And just a tip, don't break bad on the Pi here. For many people this is the only ARM platform worth working with. And definitely don't make fun of the lack of peripherals on the thing)
This is awesome.. my only comment is the first thing I went to do was to copy and paste the code blocks and found end of line whitespace and double line breaks were included (presumably for the line numbering etc.)
e.g.
sudo apt-get update
apt-cache search linux-headers-`uname -r`
Like let's say I wanted to instantiate an I2C with a custom driver in my device-tree. Can I put the controller's driver in a kernel module that lives in /lib/modules? Or do I need to compile it into the kernel?
Just make sure to run `depmod -a` after copying it into /lib/modules.
I figure it would be close to mandatory for anyone who wanted to distribute their module to others, without having to tell them to rebuild every time their kernel changed.
