[Qemu-arm] Adding /dev/tpm0 to qemu-system-aarch64

[Lakshmi Ramasubramanian]

Hello,

I am trying to add a TPM device (/dev/tpm0) for qemu-system-aarch64.

I have a TPM simulator implemented as a Trusted Application (TA). The 
device /dev/tee0 interfaces with the above TA.

Have a TPM driver that interfaces with /dev/tpm0 and talks to /dev/tee0 
in the backend.

Am trying to add /dev/tpm0 through qemu-system-aarch64 command line 
arguments like below:

  -device tpm-tis,tpmdev=tpm0

I see the following error:

qemu-system-aarch64: -device tpm-tis,tpmdev=tpm0: 'tpm-tis' is not a 
valid device model name

What is the right way to add an emulated TPM device on qemu-system-aarch64?

For qemu-system-x86_64 I have seen TPM device emulated through socket 
application and added as given below:

  -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \
  -tpmdev emulator,id=tpm0,chardev=chrtpm \
  -device tpm-tis,tpmdev=tpm0

https://github.com/qemu/qemu/blob/master/docs/specs/tpm.txt

Thanks,
 -lakshmi