FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/iommu/apple,sart.yaml

     # SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
     %YAML 1.2
     ---
     $id: http://devicetree.org/schemas/iommu/apple,sart.yaml#
     $schema: http://devicetree.org/meta-schemas/core.yaml#
     
     title: Apple SART DMA address filter
     
     maintainers:
      - Sven Peter <sven@svenpeter.dev>
    
    description:
      Apple SART is a simple address filter for DMA transactions. Regions of
      physical memory must be added to the SART's allow list before any
      DMA can target these. Unlike a proper IOMMU no remapping can be done and
      special support in the consumer driver is required since not all DMA
      transactions of a single device are subject to SART filtering.
    
      SART1 has first been used since at least the A11 (iPhone 8 and iPhone X)
      and allows 36 bit of physical address space and filter entries with sizes
      up to 24 bit.
    
      SART2, first seen in A14 and M1, allows 36 bit of physical address space
      and filter entry size up to 36 bit.
    
      SART3, first seen in M1 Pro/Max, extends both the address space and filter
      entry size to 42 bit.
    
    properties:
      compatible:
        enum:
          - apple,t6000-sart
          - apple,t8103-sart
    
      reg:
        maxItems: 1
    
      power-domains:
        maxItems: 1
    
    required:
      - compatible
      - reg
    
    additionalProperties: false
    
    examples:
      - |
        iommu@7bc50000 {
          compatible = "apple,t8103-sart";
          reg = <0x7bc50000 0x4000>;
        };

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