DART (Device Address Resolution Table) is the iommu found on Apple ARM SoCs such as the M1.
Signed-off-by: Sven Peter <s...@svenpeter.dev> --- .../bindings/iommu/apple,t8103-dart.yaml | 82 +++++++++++++++++++ MAINTAINERS | 6 ++ 2 files changed, 88 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml diff --git a/Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml b/Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml new file mode 100644 index 000000000000..2ec2d905a2ea --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml @@ -0,0 +1,82 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iommu/apple,t8103-dart.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple DART IOMMU Implementation + +maintainers: + - Sven Peter <s...@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 external to the CPU. + + Each DART instance is capable of handling up to 16 masters + mapped to up tp 16 different virtual address spaces with + page-level read/write access control flags. + + This DART IOMMU also raises interrupts in response to various + fault conditions. + +properties: + compatible: + const: apple,t8103-dart + + reg: + const: 1 + + interrupts: + const: 1 + + clocks: + maxItems: 1 + + '#iommu-cells': + const: 1 + description: + The number of the master connected to this DART. + +required: + - compatible + - reg + - '#iommu-cells' + - interrupts + +additionalProperties: false + +examples: + - |+ + dart1: dart1@382f80000 { + compatible = "apple,t8103-dart"; + reg = <0x3 0x82f80000 0x0 0x4000>; + interrupt-parent = <&aic>; + interrupts = <AIC_IRQ 781 IRQ_TYPE_LEVEL_HIGH>; + #iommu-cells = <1>; + }; + + master1 { + iommus = <&dart1 0>; + }; + + - |+ + usb_dart0: usb_dart0@382f80000 { + compatible = "apple,t8103-dart"; + reg = <0x3 0x82f80000 0x0 0x4000>; + interrupt-parent = <&aic>; + interrupts = <AIC_IRQ 781 IRQ_TYPE_LEVEL_HIGH>; + #iommu-cells = <1>; + }; + + usbdrd_dwc3_0: dwc3@382280000 { + compatible = "snps,dwc3"; + reg = <0x3 0x82280000 0x0 0x100000>; + interrupt-parent = <&aic>; + interrupts = <AIC_IRQ 777 IRQ_TYPE_LEVEL_HIGH>; + iommus = <&usb_dart0 1>; + #address-cells = <1>; + #size-cells = <0>; + dr_mode = "peripheral"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index d5e4d93a536a..1f9a4f2de88b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1236,6 +1236,12 @@ L: linux-in...@vger.kernel.org S: Odd fixes F: drivers/input/mouse/bcm5974.c +APPLE DART IOMMU DRIVER +M: Sven Peter <s...@svenpeter.dev> +L: io...@lists.linux-foundation.org +S: Maintained +F: Documentation/devicetree/bindings/iommu/apple,t8103-dart.yaml + APPLE SMC DRIVER M: Henrik Rydberg <rydb...@bitmath.org> L: linux-hw...@vger.kernel.org -- 2.25.1
