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Subject[PATCH v4 1/2] dt-bindings: iommu: add bindings for sprd IOMMU
Date
From: Chunyan Zhang <chunyan.zhang@unisoc.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@unisoc.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@gmail.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
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