Hello, new here! 
I'm looking for some pointers on how to use svdtools. Specifically in the .yaml file how do you specify a register within a collection in a peripheral? Ideally I'd actually like to expand the collection and just access the register directly, but I am seeing some issues with this approach as well. 
When I try to expand and access the register it seems like the yaml parser isn't allowing me to access the newly generated registers. I can use the _expand function to get the raw registers in the collection, but if I specify that register name in my .yaml svdtools is still saying it can't find the register. 
If this is the right forum I can share more details, or if someone can point me in the right direction more than happy to post there!
Thanks in advance!