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Date: Sun, 28 Mar 2021 09:40:08 +0200 From: Sven Peter <sven@...npeter.dev> To: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org> Cc: Sven Peter <sven@...npeter.dev>, Arnd Bergmann <arnd@...nel.org>, devicetree@...r.kernel.org, Hector Martin <marcan@...can.st>, linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>, Mohamed Mediouni <mohamed.mediouni@...amail.com>, Stan Skowronek <stan@...ellium.com>, linux-arm-kernel@...ts.infradead.org, Mark Kettenis <mark.kettenis@...all.nl>, iommu@...ts.linux-foundation.org Subject: [PATCH v2 2/3] dt-bindings: iommu: add DART iommu bindings DART (Device Address Resolution Table) is the iommu found on Apple ARM SoCs such as the M1. Signed-off-by: Sven Peter <sven@...npeter.dev> --- .../devicetree/bindings/iommu/apple,dart.yaml | 81 +++++++++++++++++++ MAINTAINERS | 6 ++ 2 files changed, 87 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/apple,dart.yaml diff --git a/Documentation/devicetree/bindings/iommu/apple,dart.yaml b/Documentation/devicetree/bindings/iommu/apple,dart.yaml new file mode 100644 index 000000000000..c0b43d90c157 --- /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@...npeter.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: dart1@...80000 { + compatible = "apple,t8103-dart"; + reg = <0x82f80000 0x4000>; + interrupts = <1 781 4>; + #iommu-cells = <1>; + }; + + master1 { + iommus = <&{/dart1} 0>; + }; + + - |+ + dart2a: dart2a@...00000 { + compatible = "apple,t8103-dart"; + reg = <0x82f00000 0x4000>; + interrupts = <1 781 4>; + #iommu-cells = <1>; + }; + dart2b: dart2@...80000 { + 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 9ac46317840b..f5397328fa1f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1236,6 +1236,12 @@ L: linux-input@...r.kernel.org S: Odd fixes F: drivers/input/mouse/bcm5974.c +APPLE DART IOMMU DRIVER +M: Sven Peter <sven@...npeter.dev> +L: iommu@...ts.linux-foundation.org +S: Maintained +F: Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml + APPLE SMC DRIVER M: Henrik Rydberg <rydberg@...math.org> L: linux-hwmon@...r.kernel.org -- 2.25.1
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