device tree, unit adress

Hi everyone,

i am having trouble at understanding device tree. i highlighted the some parts on the image (book of Derek Molloy). Does anyone know, where we can these values?

All these syntax is also a bit different, sometimes <…>, another time / … /, then { …}. Where all these comes from?
thanks a lot for your helps.

best regards

Screenshot from 2017-04-13 19-58-11.png

cpu0-supply = <&dcdc2_reg>;

aka, cpu0 is supplied by dcdc2 regulator:

reg = <0x80000000 0x10000000>;

Memory starts at 0x80000000 is 0x10000000 long:

0x54 gpio address (look at datasheet)
0x188 gpio address (look at datasheet)