Hi Peng, On Tue, Oct 15, 2024 at 11:14:41AM +0800, Peng Fan (OSS) wrote: > i.MX95 eDMA3 connects to DSU ACP, supporting dma coherent memory to > memory operations. However TBU is in the path between eDMA3 and ACP, > need to bypass the default SID 0 to make eDMA3 work properly. > > I was also thinking to introduce "bypass-sids = <0xA 0xB 0xC ...>" to > make this reusable for others, but not sure. I could switch to > "bypass-sids" if you prefer. Any reason why you can't use the sysfs to change the iommu domain type? i.e. by using the /sys/kernel/iommu_groups/<iommu_group_number>/type AFAIK, the arm-smmu-v3 driver allocates one iommu_group per device. > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > --- > Peng Fan (2): > dt-bindings: iommu: arm,smmu-v3: introduce nxp,imx95-bypass-sid-zero > iommu/arm-smmu-v3: Bypass SID0 for NXP i.MX95 > > .../devicetree/bindings/iommu/arm,smmu-v3.yaml | 4 ++++ > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 19 ++++++++++++++++--- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + > 3 files changed, 21 insertions(+), 3 deletions(-) > --- > base-commit: d61a00525464bfc5fe92c6ad713350988e492b88 > change-id: 20241014-smmuv3-120b24bc4659 > > Best regards, > -- > Peng Fan <peng.fan@xxxxxxx> > > Thanks, Pranjal
