linux-kernel - Re: [PATCH v4 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma

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Message-ID: <f65b59f3-00b4-11bf-5509-c47c4ed862f3@nvidia.com>
Date:   Wed, 8 Sep 2021 17:44:35 +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 v4 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma


On 08/09/2021 15:32, 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      | 106 +++++++++++++++++++++
>   1 file changed, 106 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..00c5582
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/nvidia,tegra-gpc-dma.yaml#

tegra186-gpc-dma.yaml

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nvidia Tegra GPC DMA Controller Device Tree Bindings
> +
> +description: |
> +  Tegra GPC DMA is the Genernal Purpose Central (GPC) DMA controller used for faster data

s/Genernal/General

I would just say

"The Tegra General Purpose Central (GPC) DMA controller is used for ..."

Over 80 characters. I assume that yaml files have that limitation.

> +  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

You appear to have alignment issues again.

> +
> +  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


Why do we need this? Don't we already have the SID in the iommu property?

Jon

-- 
nvpublic