linux之arm SMMUv3 client 设备DMA配置过程分析（8）

1.设备树

        cp0_pcie0是一个PCIe RC控制器，使用SMMU将PCIe设备的IOVA转换成物理地址，使用iommu-map-mask和iommu-map定义PCIe设备使用的Stream ID。设备树定义如下所示。

[arch/arm64/boot/dts/marvell/armada-ap80x.dtsi]
smmu: iommu@100000 {compatible = "marvell,ap806-smmu-500", "arm,mmu-500";reg = <0x100000 0x100000>;dma-coherent;#iommu-cells = <1>;#global-interrupts = <1>;interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,