[RFC PATCH V2 1/2] dt-bindings: iommu: add bindings for sprd iommu

[Chunyan Zhang <zhang.lyra@gmail.com>]

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

This patch only adds bindings to support display iommu.

The iommu support for others would be added once finished tests with those
devices, such as Image codec(jpeg) processor, a few signal processors,
including VSP(video), GSP(graphic), ISP(image), and camera CPP, etc.

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
---
 .../devicetree/bindings/iommu/sprd,iommu.yaml | 44 +++++++++++++++++++
 1 file changed, 44 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..4d9a578a7cc9
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/sprd,iommu.yaml
@@ -0,0 +1,44 @@
+# 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@gmail.com>
+
+properties:
+  compatible:
+    enum:
+      - sprd,iommu-disp
+
+  reg:
+    maxItems: 1
+
+  "#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
+
+required:
+  - compatible
+  - reg
+  - "#iommu-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    iommu_disp: iommu@63000000 {
+      compatible = "sprd,iommu-disp";
+      reg = <0x63000000 0x880>;
+      #iommu-cells = <0>;
+    };
+
+...
-- 
2.25.1