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 7title: Apple SART DMA address filter 8 9maintainers: 10 - Sven Peter <sven@svenpeter.dev> 11 12description: 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 29properties: 30 compatible: 31 enum: 32 - apple,t6000-sart 33 - apple,t8103-sart 34 35 reg: 36 maxItems: 1 37 38 power-domains: 39 maxItems: 1 40 41required: 42 - compatible 43 - reg 44 45additionalProperties: false 46 47examples: 48 - | 49 iommu@7bc50000 { 50 compatible = "apple,t8103-sart"; 51 reg = <0x7bc50000 0x4000>; 52 }; 53