AMD fTPM with linux 4.15

With fTPM enabled in the UEFI my kernel boots fine but doesn't load a /dev/tpm device node as expected. Searching the kernel logs I find the following...

$ dmesg | grep -i tpm
[    0.000000] ACPI: TPM2 0x000000007902E4D0 000034 (v04 AMD    A M I    00000001 AMI 00000000)
[    0.928120] tpm_crb MSFT0101:00: can't request region for resource [mem 0x7943a000-0x7943afff]
[    0.928141] tpm_crb: probe of MSFT0101:00 failed with error -16
[    1.090180] ima: No TPM chip found, activating TPM-bypass! (rc=-19)

Searching based on this output leads to lots of bugs with older kernels all of which were addressed via a UEFI/BIOS update rather than a kernel patch. Is this on ASRock's todo list does anyone know and/or has anyone found a fix or workaround to enabling and using the integrated TPM capabilities?

Do you happen to have the "Fast Boot" option enabled in the UEFI firmware menu?

FWIW, I saw the same problem on ASRock AB350M and reported it to ASRock support, they replied and told me to use Windows.

The issue still exists with kernel 5.0, and is due to buggy BIOS/UEFI from what I can tell.