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| author | Sven Peter <sven@svenpeter.dev> | 2021-08-03 14:16:50 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-08-12 13:15:02 +0200 |
| commit | 9d9cafb45c71c9fe302234807fae8f743056f88a (patch) | |
| tree | ec2067fbf5819aabb6c9d542e145738315f91048 | |
| parent | 892384cd998a17960dff6ebefc27375f63364111 (diff) | |
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>
| -rw-r--r-- | Documentation/devicetree/bindings/iommu/apple,dart.yaml | 81 | ||||
| -rw-r--r-- | MAINTAINERS | 6 |
2 files changed, 87 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iommu/apple,dart.yaml b/Documentation/devicetree/bindings/iommu/apple,dart.yaml new file mode 100644 index 000000000000..94aa9e9afa59 --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/apple,dart.yaml @@ -0,0 +1,81 @@ +# 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>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 19135a9d778e..d5a8f7087a74 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1262,6 +1262,12 @@ L: linux-input@vger.kernel.org S: Odd fixes F: drivers/input/mouse/bcm5974.c +APPLE DART IOMMU DRIVER +M: Sven Peter <sven@svenpeter.dev> +L: iommu@lists.linux-foundation.org +S: Maintained +F: Documentation/devicetree/bindings/iommu/apple,dart.yaml + APPLE SMC DRIVER M: Henrik Rydberg <rydberg@bitmath.org> L: linux-hwmon@vger.kernel.org |