[TF-M] ITS Encryption

Hi All I am quite new to TF-M and would like some insight into the query below. I appreciate any help you can provide.

We're adding encryption support for ITS and for nonce requirement, we're thinking of accessing TRNG which is part of the crypto partition. Now, we're aware of the possible cyclic dependency issue with the IPC model but since we're using the SFN model, will it be okay to access crypto service(TRNG) from ITS? In other words, would cyclic dependency be a concern in SFN model provided there are no limitations on hardware?

Thanks in advance. Saurabh