linux-kernel - Re: [PATCH v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma

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Date:   Thu, 23 Sep 2021 23:35:31 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Akhil R <akhilrajeev@...dia.com>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <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 v7 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma


On 23/09/2021 08:51, 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>
> ---
>   .../bindings/dma/nvidia,tegra186-gpc-dma.yaml      | 98 ++++++++++++++++++++++
>   1 file changed, 98 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..3dcf5a1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -0,0 +1,98 @@
> +# 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

If you ...

grep -r "title: NVIDIA" Documentation/devicetree/

You will find the titles all start "title: NVIDIA" and not Nvidia. 
Always good to be consistent.

> +
> +description: |
> +  The Tegra Genernal Purpose Central (GPC) DMA controller is used for faster

s/Genernal/General

> +  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:
> +  "#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
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - resets
> +  - reset-names
> +  - "#dma-cells"
> +  - iommus
> +
> +examples:
> +  - |
> +	gpcdma: dma@...0000 {

The upstream convention is ...

	gpcdma: dma-controller@...0000 {
	
> +		compatible = "nvidia,tegra186-gpcdma";
> +		reg = <0x0 0x2600000 0x0 0x210000>;
> +		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 TEGRA_SID_GPCDMA_0>;
> +		dma-coherent;
> +	};
> +...
> 

Please run ...

$ make dt_binding_check
   CHKDT   Documentation/devicetree/bindings/processed-schema-examples.json
./Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml: 
while scanning for the next token
found character that cannot start any token
   in "<unicode string>", line 34, column 1

For more details see ...
https://www.kernel.org/doc/Documentation/devicetree/writing-schema.rst

Jon

-- 
nvpublic