Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) * virtio memory mapped device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) See https://ozlabs.org/~rusty/virtio-spec/ for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) Required properties:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) - compatible:	"virtio,mmio" compatibility string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) - reg:		control registers base address and size including configuration space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) - interrupts:	interrupt generated by the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Required properties for virtio-iommu:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) - #iommu-cells:	When the node corresponds to a virtio-iommu device, it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 		linked to DMA masters using the "iommus" or "iommu-map"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 		properties [1][2]. #iommu-cells specifies the size of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		"iommus" property. For virtio-iommu #iommu-cells must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		1, each cell describing a single endpoint ID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) Optional properties:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) - iommus:	If the device accesses memory through an IOMMU, it should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		have an "iommus" property [1]. Since virtio-iommu itself
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		does not access memory through an IOMMU, the "virtio,mmio"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		node cannot have both an "#iommu-cells" and an "iommus"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		property.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) Example:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	virtio_block@3000 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		compatible = "virtio,mmio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		reg = <0x3000 0x100>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		interrupts = <41>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		/* Device has endpoint ID 23 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		iommus = <&viommu 23>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	viommu: iommu@3100 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		compatible = "virtio,mmio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		reg = <0x3100 0x100>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		interrupts = <42>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		#iommu-cells = <1>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) [1] Documentation/devicetree/bindings/iommu/iommu.txt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) [2] Documentation/devicetree/bindings/pci/pci-iommu.txt