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From: Sven Peter via iommu <iommu@lists.linux-foundation.org>
To: iommu@lists.linux-foundation.org
Cc: Arnd Bergmann <arnd@kernel.org>,
	devicetree@vger.kernel.org, Will Deacon <will@kernel.org>,
	Hector Martin <marcan@marcan.st>,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Sven Peter <sven@svenpeter.dev>, Marc Zyngier <maz@kernel.org>,
	Mohamed Mediouni <mohamed.mediouni@caramail.com>,
	Stan Skowronek <stan@corellium.com>,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	Mark Kettenis <mark.kettenis@xs4all.nl>
Subject: [PATCH 2/3] dt-bindings: iommu: add DART iommu bindings
Date: Sat, 20 Mar 2021 15:20:08 +0000	[thread overview]
Message-ID: <20210320151903.60759-3-sven@svenpeter.dev> (raw)
In-Reply-To: <20210320151903.60759-1-sven@svenpeter.dev>

DART (Device Address Resolution Table) is the iommu found on Apple
ARM SoCs such as the M1.

Signed-off-by: Sven Peter <sven@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 <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 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-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,t8103-dart.yaml
+
 APPLE SMC DRIVER
 M:	Henrik Rydberg <rydberg@bitmath.org>
 L:	linux-hwmon@vger.kernel.org
--
2.25.1


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  parent reply	other threads:[~2021-03-20 16:05 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-20 15:19 [PATCH 0/3] Apple M1 DART IOMMU driver Sven Peter via iommu
2021-03-20 15:19 ` [PATCH 1/3] iommu: io-pgtable: add DART pagetable format Sven Peter via iommu
2021-03-24 16:37   ` Robin Murphy
2021-03-25 20:47     ` Sven Peter via iommu
2021-03-20 15:20 ` Sven Peter via iommu [this message]
2021-03-22  0:15   ` [PATCH 2/3] dt-bindings: iommu: add DART iommu bindings Rob Herring
2021-03-22 18:16     ` Sven Peter via iommu
2021-03-21 16:00 ` [PATCH 0/3] Apple M1 DART IOMMU driver Mark Kettenis
2021-03-21 17:22   ` Sven Peter via iommu
2021-03-21 18:35     ` Mark Kettenis
2021-03-22 22:17       ` Sven Peter via iommu
2021-03-23 20:00         ` Mark Kettenis
2021-03-23 21:03           ` Sven Peter via iommu
2021-03-21 17:28   ` Sven Peter via iommu
2021-03-23 20:53   ` Rob Herring
2021-03-23 22:33     ` Mark Kettenis
2021-03-25  7:53     ` Sven Peter via iommu
2021-03-25 11:50       ` Robin Murphy
2021-03-25 20:49         ` Sven Peter via iommu
2021-03-27 15:33         ` Sven Peter via iommu
2021-03-25 21:41       ` Arnd Bergmann
2021-03-26 15:59         ` Mark Kettenis
2021-03-26 16:09           ` Arnd Bergmann
2021-03-26 16:10           ` Sven Peter via iommu
2021-03-26 16:38             ` Arnd Bergmann
2021-03-26 17:06               ` Sven Peter via iommu
2021-03-26 17:26               ` Mark Kettenis
2021-03-26 17:34                 ` Robin Murphy
2021-03-26 17:51                   ` Sven Peter via iommu
2021-03-26 19:59                     ` Arnd Bergmann
2021-03-26 21:16                       ` Mark Kettenis
2021-03-27 15:30                       ` Sven Peter via iommu
2021-03-26 20:03                 ` Arnd Bergmann
2021-03-26 21:13                   ` Mark Kettenis
2021-03-24 15:29 ` Robin Murphy
2021-03-25  7:58   ` Sven Peter via iommu

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