The TPM 2.0 device found in a ThinkPad T480 (STM7304) can be accessed by
adding its ACPI CID (MSFT0101) to tpm_acpi.c, and using security/tpm2-tools.
# kldload tpm
tpm0: <Trusted Platform Module> iomem 0xfed40000-0xfed44fff on acpi0
tpm: device 0x0000104a rev 0x4e
# tpm2_pcrread ...
However, this breaks suspend/resume, as noted by OpenBSD