tssstartup man page

startup

Runs TPM2_Startup

[-c startup clear (default)] [-s startup state] [-st run TPM2_SelfTest] [-sto run only TPM2_SelfTest (no startup)]

The full documentation for tssstartup is maintained as a Texinfo manual.  If the info and tssstartup programs are properly installed at your site, the command

info tssstartup

should give you access to the complete manual.