linux-kernel - Re: [PATCH v11 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma

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Message-ID: <YYE7D2W721a1L4Mb@robh.at.kernel.org>
Date:   Tue, 2 Nov 2021 08:20:15 -0500
From:   Rob Herring <robh@...nel.org>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     dan.j.williams@...el.com, devicetree@...r.kernel.org,
        dmaengine@...r.kernel.org, jonathanh@...dia.com,
        kyarlagadda@...dia.com, ldewangan@...dia.com,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        p.zabel@...gutronix.de, rgumasta@...dia.com,
        thierry.reding@...il.com, vkoul@...nel.org
Subject: Re: [PATCH v11 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma

On Thu, Oct 28, 2021 at 06:53:36PM +0530, Akhil R wrote:
> Add DT binding document for Nvidia Tegra GPCDMA controller.
> 
> Signed-off-by: Rajesh Gumasta <rgumasta@...dia.com>
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> Reviewed-by: Jon Hunter <jonathanh@...dia.com>
> ---
>  .../bindings/dma/nvidia,tegra186-gpc-dma.yaml      | 115 +++++++++++++++++++++
>  1 file changed, 115 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..bc97efc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -0,0 +1,115 @@
> +# 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 General 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@...dia.com>
> +  - Rajesh Gumasta <rgumasta@...dia.com>
> +
> +allOf:
> +  - $ref: "dma-controller.yaml#"
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - nvidia,tegra186-gpcdma
> +          - nvidia,tegra194-gpcdma
> +      - items:
> +          - const: nvidia,tegra186-gpcdma
> +          - const: nvidia,tegra194-gpcdma

One of these is wrong. Either 186 has a fallback to 194 or it doesn't.

> +
> +  "#dma-cells":
> +    const: 1
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: |

Don't need '|' if there's no formatting.

> +      Should contain all of the per-channel DMA interrupts in
> +      ascending order with respect to the DMA channel index.
> +    minItems: 1
> +    maxItems: 32
> +
> +  resets:
> +    description: |
> +      Should contain the reset phandle for gpcdma.

Not really a useful description. Drop.

> +    maxItems: 1
> +
> +  reset-names:
> +    const: gpcdma
> +
> +  iommus:
> +    maxItems: 1
> +
> +  dma-coherent: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - resets
> +  - reset-names
> +  - "#dma-cells"
> +  - iommus
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/memory/tegra186-mc.h>
> +    #include <dt-bindings/reset/tegra186-reset.h>
> +
> +    dma-controller@...0000 {
> +        compatible = "nvidia,tegra186-gpcdma";
> +        reg = <0x2600000 0x0>;
> +        resets = <&bpmp TEGRA186_RESET_GPCDMA>;
> +        reset-names = "gpcdma";
> +        interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
> +        #dma-cells = <1>;
> +        iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
> +        dma-coherent;
> +    };
> +...
> -- 
> 2.7.4
> 
>