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Robin did not chime in yet, but from what I understood the DT-child-node approach will be the way we should go here. I accept above point of view and I am fine with this, thus Vishnu and Vikash - please go ahead with DT-child-node solution we had some time ago." [2] https://lore.kernel.org/linux-iommu/c7b956a9-d3e8-4e18-b780-5d08f5cd2ca1@kernel.org/ The fsl,edma controller on i.MX95 has per-channel SMMU stream IDs, where paired TX/RX channels share the same stream ID. The previous approach used iommu-map at the controller node, but this is architecturally wrong for platform devices - platform_dma_configure() passes id=NULL to of_dma_configure_id(), so the iommu-map property is never consulted by the kernel. This series adds per-channel child nodes to the eDMA binding and driver. Each child node (dma-channel@) describes a real per-channel MMIO region and can carry its own interrupts, iommus, and power-domains properties. This approach: - Uses the standard iommus property for per-channel stream ID assignment, which works through the existing of_dma_configure() -> of_iommu_configure() -> iommu_probe_device() path. - Provides real MMIO addresses in child reg properties, enabling Xen dom0less device passthrough where the hypervisor needs physical address information for channel-level granularity. - Maintains full backward compatibility - existing DTS without child nodes works unchanged. The driver configures per-channel IOMMU following the same pattern as tegra186-gpc-dma: set bus type on the dma_chan_dev, coerce the DMA mask, call of_dma_configure() with the child node, and set chan_dma_dev=true so dmaengine_get_dma_device() returns the per-channel device for DMA API calls. Tested on i.MX95 EVK with SMMUv3 enabled for edma2 channels 2-19 (stream IDs 0x30-0x38, paired). Channels without iommus (used by SPI, I2C, etc.) continue to work in bypass mode. Signed-off-by: Peng Fan --- Changes in V2: - Switch to add child node for dma channel. - Link to V1: https://lore.kernel.org/dmaengine/20260916-edma-iommu-v1-0-e1731968081e@nxp.com/ --- Peng Fan (3): dt-bindings: dma: fsl,edma: add per-channel child node support dmaengine: fsl-edma: support per-channel DT child nodes arm64: dts: imx95: convert eDMA to per-channel child nodes .../devicetree/bindings/dma/fsl,edma.yaml | 70 +- arch/arm64/boot/dts/freescale/imx95.dtsi | 774 +++++++++++++++++---- drivers/dma/fsl-edma-common.c | 10 +- drivers/dma/fsl-edma-main.c | 149 +++- 4 files changed, 864 insertions(+), 139 deletions(-) --- base-commit: 38cc189d30504989ed32704c9b87992de304d0fc change-id: 20260926-edma-iommu-f5d0d97295d2 Best regards, -- Peng Fan