Add device-tree binding documentation for the Hisi Ascend sdma controller. Signed-off-by: Guo Mengqi <guomengqi3@xxxxxxxxxx> --- .../bindings/dma/hisi,ascend-sdma.yaml | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/hisi,ascend-sdma.yaml diff --git a/Documentation/devicetree/bindings/dma/hisi,ascend-sdma.yaml b/Documentation/devicetree/bindings/dma/hisi,ascend-sdma.yaml new file mode 100644 index 000000000000..eab8192fac67 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/hisi,ascend-sdma.yaml @@ -0,0 +1,75 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/dma/hisi,ascend-sdma.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: HISI Ascend System DMA (SDMA) controller + +description: | + The Ascend SDMA controller is used for transferring data + in system memory. It utilizes IOMMU SVA feature and accepts + virtual address from user process. + +maintainers: + - Guo Mengqi <guomengqi3@xxxxxxxxxx> + +allOf: + - $ref: dma-controller.yaml# + +properties: + compatible: + enum: + - hisi,ascend310-sdma + - hisi,ascend910-sdma + + reg: + maxItems: 1 + + '#dma-cells': + const: 1 + description: + Clients specify a single cell with channel number. + + hisi,ascend-sdma-channel-map: + description: | + bitmap, each bit stands for a channel that is allowed to + use by this system. Maximum 64 bits. + $ref: /schemas/types.yaml#/definitions/uint64 + + iommus: + maxItems: 1 + + pasid-num-bits: + description: | + sdma utilizes iommu sva feature to transfer user space data. + It acts as a basic dma controller if not bound to user space. + const: 0x10 + + dma-coherent: true + + dma-can-stall: true + +required: + - compatible + - reg + - hisi,ascend-sdma-channel-map + - '#dma-cells' + - iommus + +additionalProperties: false + +examples: + - | + dma-controller@880e0000 { + compatible = "hisilicon,ascend310-sdma"; + reg = <0x880e0000 0x10000>; + hisi,ascend-sdma-channel-map = <0x00000000 0x0000ff00>; + iommus = <&smmu 0x7f46>; + pasid-num-bits = <0x10>; + dma-coherent; + dma-can-stall; + #dma-cells = <1>; + }; + +... -- 2.17.1
