57 lines
1.4 KiB
YAML
57 lines
1.4 KiB
YAML
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# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iommu/apple,sart.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Apple SART DMA address filter
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maintainers:
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- Sven Peter <sven@svenpeter.dev>
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description:
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Apple SART is a simple address filter for DMA transactions. Regions of
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physical memory must be added to the SART's allow list before any
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DMA can target these. Unlike a proper IOMMU no remapping can be done and
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special support in the consumer driver is required since not all DMA
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transactions of a single device are subject to SART filtering.
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SART1 has first been used since at least the A11 (iPhone 8 and iPhone X)
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and allows 36 bit of physical address space and filter entries with sizes
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up to 24 bit.
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SART2, first seen in A14 and M1, allows 36 bit of physical address space
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and filter entry size up to 36 bit.
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SART3, first seen in M1 Pro/Max, extends both the address space and filter
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entry size to 42 bit.
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properties:
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compatible:
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oneOf:
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- items:
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- const: apple,t8112-sart
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- const: apple,t6000-sart
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- enum:
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- apple,t6000-sart
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- apple,t8103-sart
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reg:
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maxItems: 1
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power-domains:
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maxItems: 1
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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iommu@7bc50000 {
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compatible = "apple,t8103-sart";
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reg = <0x7bc50000 0x4000>;
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};
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