TF-A Hang on NXP i.MX 8M Plus QuadLite

[Marcel Ziswiler]

Hi there

We recently got our first batch of i.MX 8M Plus QuadLite based SoMs. While NXP downstream works just fine on
them they just hang booting with latest upstream U-Boot (and TF-A). Replacing TF-A with the downstream NXP one
made upstream U-Boot work as well. Further debugging TF-A showed imx_gpc_pm_domain_enable() to be the culprit.
Looking more specifically I discovered the following so far downstream-only commit [1]. So it looks like in
downstream NXP is limiting the to-be-enabled power management domains to HSIOMIX, USB1_PHY and USB2_PHY.
Anybody knows why exactly this is done and why this got never upstreamed?

Thank you very much for any insights into this matter.

[1] https://github.com/nxp-imx/imx-atf/commit/47759cfca10b2286a218062915d4a280848cfc15

Cheers

Marcel