>OK, well I see what you are saying, but if we intended to support all 3 for Tegra194, then we should ensure all 3 are initialised correctly. The driver intend to support up to 3 instances. It doesn't really mandate that all three instances be present in same DT node. Each mmio aperture in "reg" property is an instance here. reg = <inst0_base, size>, <inst1_base, size>, <inst2_base, size>; The reg can have all three or less and driver just configures based on reg and it works fine. >It would be better to query the number of SMMUs populated in device-tree and then ensure that all are initialised correctly. Getting the IORESOURCE_MEM is the way to count the instances driver need to support. In a way, It is already querying through IORESOURCE_MEM here. -KR
