linux-kernel - [PATCH v4 1/2] dt-bindings: iommu: add bindings for sprd IOMMU

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Message-Id: <20210204071404.891098-2-zhang.lyra@gmail.com>
Date:   Thu,  4 Feb 2021 15:14:03 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        Baolin Wang <baolin.wang7@...il.com>,
        linux-kernel@...r.kernel.org, Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Sheng Xu <sheng.xu@...soc.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>
Subject: [PATCH v4 1/2] dt-bindings: iommu: add bindings for sprd IOMMU

From: Chunyan Zhang <chunyan.zhang@...soc.com>

This IOMMU module can be used by Unisoc's multimedia devices, such as
display, Image codec(jpeg) and a few signal processors, including
VSP(video), GSP(graphic), ISP(image), and CPP(camera pixel processor), etc.

Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 .../devicetree/bindings/iommu/sprd,iommu.yaml | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/sprd,iommu.yaml

diff --git a/Documentation/devicetree/bindings/iommu/sprd,iommu.yaml b/Documentation/devicetree/bindings/iommu/sprd,iommu.yaml
new file mode 100644
index 000000000000..36abd2187a19
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/sprd,iommu.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2020 Unisoc Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iommu/sprd,iommu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Unisoc IOMMU and Multi-media MMU
+
+maintainers:
+  - Chunyan Zhang <zhang.lyra@...il.com>
+
+properties:
+  compatible:
+    enum:
+      - sprd,iommu-v1
+
+  "#iommu-cells":
+    const: 0
+    description:
+      Unisoc IOMMUs are all single-master IOMMU devices, therefore no
+      additional information needs to associate with its master device.
+      Please refer to the generic bindings document for more details,
+      Documentation/devicetree/bindings/iommu/iommu.txt
+
+  reg:
+    maxItems: 1
+    description:
+      Not required if 'sprd,iommu-regs' is defined.
+
+  clocks:
+    description:
+      Reference to a gate clock phandle, since access to some of IOMMUs are
+      controlled by gate clock, but this is not required.
+
+  sprd,iommu-regs:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Reference to a syscon phandle plus 1 cell, the syscon defines the
+      register range used by IOMMU and multimedia device, the cell
+      defines the offset for IOMMU registers. Since IOMMU module shares
+      the same register range with the multimedia device which uses it.
+
+required:
+  - compatible
+  - "#iommu-cells"
+
+oneOf:
+  - required:
+      - reg
+  - required:
+      - sprd,iommu-regs
+
+additionalProperties: false
+
+examples:
+  - |
+    iommu_disp: iommu-disp {
+      compatible = "sprd,iommu-v1";
+      sprd,iommu-regs = <&dpu_regs 0x800>;
+      #iommu-cells = <0>;
+    };
+
+  - |
+    iommu_jpg: iommu-jpg {
+      compatible = "sprd,iommu-v1";
+      sprd,iommu-regs = <&jpg_regs 0x300>;
+      #iommu-cells = <0>;
+      clocks = <&mm_gate 1>;
+    };
+
+...
-- 
2.25.1