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reg = <...>; #iommu-cells = <1>; interrupt-names = "combined"; interrupts = <0 169 4>; }; but it is missing one important detail which just arise that actually there is additional HW logic which deals with SMMU interrupts separately. There is a secure part (global, cmd, event - gerror, cmdq-sync, eventq in DT) and non secure part (pri, global, cmd, event - priq, gerror, cmdq-sync, eventq in DT). Based on my information all these interrupts should be acked once handled to be able to get another one. The driver itself is able to handle them separately but we didn't create any solution to reach custom HW to do it. I looked at f935448acf46 ("iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #126") which introduced combined IRQs but it looks like that there is no need for additional ACK of that IRQs. The HW logic itself is handling secure and non secure settings for SMMU that's why would be the best to avoid directly mapping it in Linux. One way to go is to create secondary interrupt controller driver a) ioremap one with notice about secure part because we are using SMMU only with NS world b) firmware based to tunnel accesses via SMCs and allow only access to limited amount of registers The second way is likely create any hooks in the driver to be able to provide additional SOC specific hooks. I am not quite sure which way would be the best that's why I would like to get some recommendation from you. Stefano: please correct me if any of my description is not accurate. Thanks, Michal