From: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx> 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@xxxxxxxxxx> --- .../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..4fc99e81fa66 --- /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@xxxxxxxxx> + +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 the iommu and the media device, the cell + defines the offset for iommu registers. Since iommu module shares + the same register range with the media 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
