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SubjectRe: [PATCH v5 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma
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On 16/09/2021 13:18, Akhil R wrote:
> Add DT binding document for Nvidia Tegra GPCDMA controller.
>
> Signed-off-by: Rajesh Gumasta <rgumasta@nvidia.com>
> Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
> ---
> .../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 107 +++++++++++++++++++++
> 1 file changed, 107 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
>
> diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> new file mode 100644
> index 0000000..cf76afb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/nvidia,tegra186-gpc-dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nvidia Tegra GPC DMA Controller Device Tree Bindings
> +
> +description: |
> + The Tegra Genernal Purpose Central (GPC) DMA controller is used for faster
> + data transfers between memory to memory, memory to device and device to
> + memory.
> +
> +maintainers:
> + - Jon Hunter <jonathanh@nvidia.com>
> + - Rajesh Gumasta <rgumasta@nvidia.com>
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
> +
> +properties:
> + "#dma-cells":
> + const: 1
> +
> + compatible:
> + - enum:
> + - nvidia,tegra186-gpcdma
> + - nvidia,tegra194-gpcdma
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + minItems: 1
> + maxItems: 32
> +
> + resets:
> + maxItems: 1
> +
> + reset-names:
> + const: gpcdma
> +
> + iommus:
> + maxItems: 1
> +
> + nvidia,stream-id:
> + description: |
> + stream-id corresponding to GPC DMA clients.
> + Defaults to TEGRA186_SID_GPCDMA_0 if not given


Does the value programmed here always match that, that is specified in
the iommus property? If so we should not need this property.

Jon

--
nvpublic

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