On 2024-10-15 4:14 am, 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'm confused, why not just describe that the device owns this StreamID
in the DT the normal way, i.e, "iommus = <&smmu 0>;"?
Thanks,
Robin.
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.
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,
