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From: Sven Peter via iommu <iommu@lists.linux-foundation.org>
To: Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>, Rob Herring <robh+dt@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>,
	devicetree@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	Hector Martin <marcan@marcan.st>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Sven Peter <sven@svenpeter.dev>,
	Mohamed Mediouni <mohamed.mediouni@caramail.com>,
	Mark Kettenis <mark.kettenis@xs4all.nl>,
	linux-arm-kernel@lists.infradead.org,
	Stan Skowronek <stan@corellium.com>
Subject: [PATCH v2 2/3] dt-bindings: iommu: add DART iommu bindings
Date: Sun, 28 Mar 2021 09:40:08 +0200	[thread overview]
Message-ID: <20210328074009.95932-3-sven@svenpeter.dev> (raw)
In-Reply-To: <20210328074009.95932-1-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>
---
 .../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@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: dart1@82f80000 {
+      compatible = "apple,t8103-dart";
+      reg = <0x82f80000 0x4000>;
+      interrupts = <1 781 4>;
+      #iommu-cells = <1>;
+    };
+
+    master1 {
+      iommus = <&{/dart1} 0>;
+    };
+
+  - |+
+    dart2a: dart2a@82f00000 {
+      compatible = "apple,t8103-dart";
+      reg = <0x82f00000 0x4000>;
+      interrupts = <1 781 4>;
+      #iommu-cells = <1>;
+    };
+    dart2b: dart2@82f80000 {
+      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@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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iommu@lists.linux-foundation.org
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  parent reply	other threads:[~2021-03-28  7:41 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-28  7:40 [PATCH v2 0/3] Apple M1 DART IOMMU driver Sven Peter via iommu
2021-03-28  7:40 ` [PATCH v2 1/3] iommu: io-pgtable: add DART pagetable format Sven Peter via iommu
2021-04-07 10:44   ` Will Deacon
2021-04-09 16:55     ` Sven Peter via iommu
2021-04-09 19:38       ` Arnd Bergmann
2021-04-19 16:31         ` Will Deacon
2021-03-28  7:40 ` Sven Peter via iommu [this message]
2021-03-28  8:16   ` [PATCH v2 2/3] dt-bindings: iommu: add DART iommu bindings Arnd Bergmann
2021-03-28  9:22     ` Sven Peter via iommu
2021-03-28  7:40 ` [PATCH v2 3/3] iommu: dart: Add DART iommu driver Sven Peter via iommu
2021-04-07 10:42   ` Will Deacon
2021-04-09 16:50     ` Sven Peter via iommu

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