1 # SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iommu/apple,sart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Apple SART DMA address filter
8
9 maintainers:
10 - Sven Peter <sven@svenpeter.dev>
11
12 description:
13 Apple SART is a simple address filter for DMA transactions. Regions of
14 physical memory must be added to the SART's allow list before any
15 DMA can target these. Unlike a proper IOMMU no remapping can be done and
16 special support in the consumer driver is required since not all DMA
17 transactions of a single device are subject to SART filtering.
18
19 SART1 has first been used since at least the A11 (iPhone 8 and iPhone X)
20 and allows 36 bit of physical address space and filter entries with sizes
21 up to 24 bit.
22
23 SART2, first seen in A14 and M1, allows 36 bit of physical address space
24 and filter entry size up to 36 bit.
25
26 SART3, first seen in M1 Pro/Max, extends both the address space and filter
27 entry size to 42 bit.
28
29 properties:
30 compatible:
31 oneOf:
32 - items:
33 - const: apple,t8112-sart
34 - const: apple,t6000-sart
35 - enum:
36 - apple,t6000-sart
37 - apple,t8103-sart
38
39 reg:
40 maxItems: 1
41
42 power-domains:
43 maxItems: 1
44
45 required:
46 - compatible
47 - reg
48
49 additionalProperties: false
50
51 examples:
52 - |
53 iommu@7bc50000 {
54 compatible = "apple,t8103-sart";
55 reg = <0x7bc50000 0x4000>;
56 };
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