Reserved resources for Zephyr / NCS, eg. DPPI's on the nRF54 ?

If I am to do a custom SPI Slave driver to achieve ultra low latency handling and would like it to coexist with NCS / Zephyr, is there a document describing this ?

E.g. which resources are reserved by by NCS / Zephyr ?

I will be testing it on the nRF54L15 DK's SPIS21.

Thanks,

Thorkild

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