On Wed, Feb 03, 2021 at 05:07:26PM +0800, Chunyan Zhang wrote: > 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>; If the IOMMU is contained within another device, then it should just be a child node of that device. Or just make 'dpu_regs' an IOMMU provider (i.e. just add #iommu-cells to it). > + #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 >
