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We know the parent_bus_offset, either computed from a DT reg property (the offset is the CPU physical addr - the 'config'/'addr_space' address on the parent bus) or from a .cpu_addr_fixup() (which may have used a host bridge window offset). Apply that parent_bus_offset instead of calling .cpu_addr_fixup() when programming the ATU. This assumes all intermediate addresses are at the same offset from the CPU physical addresses. [bhelgaas: commit log] Link: https://lore.kernel.org/r/20250315201548.858189-13-helgaas@kernel.org Signed-off-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>