I'm interested in using CY4521 evalkit. However from looking at the schematics I don't understand how the CCG2 communicates the source voltage setting to the DC/DC on the base board. The VSEL lines are not connected to the CCG2 anywhere?
Please refer to the kit schematics, TP17, TP20 and TP18, TP21 are test points through which you can can be mount two-pin jumper headers or solder resistors. These could be loaded when you are not SWD programming the CCG2.