Hi, The M1 SoCs have a second slightly different variant of the regular DART used for the USB4 PCIe ports. It supports 64 instead of 16 streams which requires a minor change to the MMIO layout. There seems to be no way to tell them apart from the regular DARTs by just looking at the DART_PARAMs register so we have to add a new compatible for those. Best, Sven Sven Peter (4): dt-bindings: iommu: dart: Add t8103-usb4-dart compatible iommu: dart: Add flag to override bypass support iommu: dart: Write to all DART_T8020_STREAM_SELECT iommu: dart: Add support for t8103 USB4 DART .../devicetree/bindings/iommu/apple,dart.yaml | 1 + drivers/iommu/apple-dart.c | 42 ++++++++++++++++++- 2 files changed, 41 insertions(+), 2 deletions(-) -- 2.25.1
