Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iommu/apple,sart.yaml b/Documentation/devicetree/bindings/iommu/apple,sart.yaml
new file mode 100644
index 000000000..1524fa309
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/apple,sart.yaml
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+# 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>;
+    };