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authorSven Peter <sven@svenpeter.dev>2021-08-03 15:16:50 +0300
committerJoerg Roedel <jroedel@suse.de>2021-08-12 14:15:02 +0300
commit9d9cafb45c71c9fe302234807fae8f743056f88a (patch)
treeec2067fbf5819aabb6c9d542e145738315f91048 /Documentation/devicetree/bindings/iommu
parent892384cd998a17960dff6ebefc27375f63364111 (diff)
downloadlinux-9d9cafb45c71c9fe302234807fae8f743056f88a.tar.xz
dt-bindings: iommu: add DART iommu bindings
DART (Device Address Resolution Table) is the iommu found on Apple ARM SoCs such as the M1. Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Signed-off-by: Sven Peter <sven@svenpeter.dev> Link: https://lore.kernel.org/r/20210803121651.61594-3-sven@svenpeter.dev Signed-off-by: Joerg Roedel <jroedel@suse.de>
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iommu/apple,dart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple DART IOMMU
+
+maintainers:
+ - Sven Peter <sven@svenpeter.dev>
+
+description: |+
+ Apple SoCs may contain an implementation of their Device Address
+ Resolution Table which provides a mandatory layer of address
+ translations for various masters.
+
+ Each DART instance is capable of handling up to 16 different streams
+ with individual pagetables and page-level read/write protection flags.
+
+ This DART IOMMU also raises interrupts in response to various
+ fault conditions.
+
+properties:
+ compatible:
+ const: apple,t8103-dart
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ description:
+ Reference to the gate clock phandle if required for this IOMMU.
+ Optional since not all IOMMUs are attached to a clock gate.
+
+ '#iommu-cells':
+ const: 1
+ description:
+ Has to be one. The single cell describes the stream id emitted by
+ a master to the IOMMU.
+
+required:
+ - compatible
+ - reg
+ - '#iommu-cells'
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |+
+ dart1: iommu@82f80000 {
+ compatible = "apple,t8103-dart";
+ reg = <0x82f80000 0x4000>;
+ interrupts = <1 781 4>;
+ #iommu-cells = <1>;
+ };
+
+ master1 {
+ iommus = <&dart1 0>;
+ };
+
+ - |+
+ dart2a: iommu@82f00000 {
+ compatible = "apple,t8103-dart";
+ reg = <0x82f00000 0x4000>;
+ interrupts = <1 781 4>;
+ #iommu-cells = <1>;
+ };
+ dart2b: iommu@82f80000 {
+ compatible = "apple,t8103-dart";
+ reg = <0x82f80000 0x4000>;
+ interrupts = <1 781 4>;
+ #iommu-cells = <1>;
+ };
+
+ master2 {
+ iommus = <&dart2a 0>, <&dart2b 1>;
+ };