linux-kernel - [PATCH 2/3] dt-bindings: iommu: add DART iommu bindings

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Date:   Sat, 20 Mar 2021 15:20:08 +0000
From:   Sven Peter <sven@...npeter.dev>
To:     iommu@...ts.linux-foundation.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Hector Martin <marcan@...can.st>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Marc Zyngier <maz@...nel.org>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Sven Peter <sven@...npeter.dev>
Subject: [PATCH 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>
---
 .../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 <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 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@...f80000 {
+      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@...f80000 {
+      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@...280000 {
+      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-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