Add device-tree binding documentation for the Hisi Ascend sdma controller. Signed-off-by: Guo Mengqi <guomengqi3@xxxxxxxxxx> --- .../bindings/dma/hisi,ascend-sdma.yaml | 82 +++++++++++++++++++ 1 file changed, 82 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..beb2b3597f4d --- /dev/null +++ b/Documentation/devicetree/bindings/dma/hisi,ascend-sdma.yaml @@ -0,0 +1,82 @@ +# 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: + const: hisilicon,sdma + + reg: + maxItems: 1 + + '#dma-cells': + const: 1 + description: + Clients specify a single cell with channel number. + + ascend_sdma_channel_map: + description: | + bitmap, each bit stands for a channel that is allowed to + use by this system. Maximum 32 bits. + maximum: 0xffffffff + + ascend_sdma_channel_iomem_size: + description: | + depends on different platforms to be released. There are + currently two possible values. A default value is used if + the property is not set. + - enum: + - 0x400 + - 0x1000 + + iommus: + maxItems: 1 + + pasid-num-bits: + description: | + sdma utilizes iommu sva feature to transfer user space data. + It act as a basic dma controller if not bound to user space. + const: 0x10 + + dma-coherent: true + + dma-can-stall: true + +required: + - compatible + - reg + - ascend_sdma_channel_map + - '#dma-cells' + - iommus + +additionalProperties: false + +examples: + - | + sdma: dma-controller@880E0000 { + compatible = "hisilicon,sdma"; + reg = <0x880e0000 0x10000>; + ascend_sdma_channel_map = <0xff00>; + iommus = <&smmu 0x7f46>; + pasid-num-bits = <0x10>; + dma-coherent; + dma-can-stall; + #dma-cells = <1>; + }; + +... -- 2.17.1
