[TF-A] Interaction with TF-a from NS World

Hello All,

I am coming from the TF-m domain, and now I am struggling with TF-a as I am not a Linux expert.

I am just looking for the interactions with TF-a, such as getting psa attestation token etc.

How can I find example these interactions from NS World (Linux) or lower privilege Secure World Executions such as OP-TEE or OP-TEE TAs?

I suppose there shall be drivers and APIs provided by TF-a?

Thanks

Max