Commit 9d9cafb4 authored by Sven Peter's avatar Sven Peter Committed by Joerg Roedel
Browse files

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: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarAlyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: default avatarSven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20210803121651.61594-3-sven@svenpeter.dev


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 892384cd

Documentation/devicetree/bindings/iommu/apple,dart.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,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>;

    };

MAINTAINERS

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@@ -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