Broadcom builds the TPU chip. Google designs it. You can’t avoid partnering with Broadcom if you want TPUs in significant volume .
TSMC builds the TPU chip. Broadcom does the rest of the electronics (motherboard, networking, etc...)
Broadcom designs it as well [0], though GCP also works on design as well.
[0] - https://www.broadcom.com/products/custom-silicon
TSMC builds the TPU chip. Broadcom does the rest of the electronics (motherboard, networking, etc...)