Add iommu-map support to the fsl-edma driver to enable per-channel IOMMU
stream ID mapping for eDMA controllers.

On i.MX95, eDMA channels are assigned individual stream IDs by the
SMMU, with paired channels (e.g. TX/RX) sharing the same SID. The
standard iommu-map devicetree property is used to describe this
mapping, following the same pattern used by PCI controllers.

Patch 1 adds the iommu-map property to the fsl,edma dt-binding schema
and includes an fsl,imx95-edma5 example demonstrating per-channel
mappings.

Patch 2 implements the driver support: at probe time, per-channel
devices are prepared with DMA masks and bus pointers; at xlate time,
the channel index is looked up in iommu-map to attach the appropriate
IOMMU domain. Channels without a matching entry operate in bypass
mode.

To test this patch on i.MX95 for channels using shared SID, needs:
https://lore.kernel.org/linux-iommu/20260916-smmu-shared-sid-v1-0-517384504aee@nxp.com/T/#t

If only test channels that not needs shared SID, no need above patchset.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
Peng Fan (2):
      dt-bindings: dma: fsl,edma: add iommu-map property
      dmaengine: fsl-edma: add per-channel IOMMU support via iommu-map

 .../devicetree/bindings/dma/fsl,edma.yaml          | 89 ++++++++++++++++++++++
 drivers/dma/fsl-edma-common.c                      |  6 +-
 drivers/dma/fsl-edma-common.h                      |  1 +
 drivers/dma/fsl-edma-main.c                        | 76 +++++++++++++++++-
 4 files changed, 169 insertions(+), 3 deletions(-)
---
base-commit: e6e35979777d646fe3c7c94dca7dd32fb25d45f4
change-id: 20260916-edma-iommu-d5b8d0b515dd

Best regards,
--  
Peng Fan <peng.fan@nxp.com>