linux-kernel - Re: [PATCH v2] dt-bindings: dma: Convert mtk-uart-apdma to DT schema

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Message-ID: <6c51427a-98e2-0bbe-8f4b-37a4d9cacec7@canonical.com>
Date:   Wed, 16 Feb 2022 17:13:30 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, vkoul@...nel.org
Cc:     robh+dt@...nel.org, sean.wang@...iatek.com, matthias.bgg@...il.com,
        long.cheng@...iatek.com, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2] dt-bindings: dma: Convert mtk-uart-apdma to DT schema

On 16/02/2022 16:13, AngeloGioacchino Del Regno wrote:
> Convert the MediaTek UART APDMA Controller binding to DT schema.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> v2: Fixed interrupt maxItems to 16, added interrupts/reg maxItems constraint
>     to 8 when the dma-requests property is not present
> 
>  .../bindings/dma/mediatek,uart-dma.yaml       | 123 ++++++++++++++++++
>  .../bindings/dma/mtk-uart-apdma.txt           |  56 --------
>  2 files changed, 123 insertions(+), 56 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
>  delete mode 100644 Documentation/devicetree/bindings/dma/mtk-uart-apdma.txt
> 
> diff --git a/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml b/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
> new file mode 100644
> index 000000000000..67dbb2fed74c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml
> @@ -0,0 +1,123 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/mediatek,uart-dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek UART APDMA controller
> +
> +maintainers:
> +  - Long Cheng <long.cheng@...iatek.com>
> +
> +description: |
> +  The MediaTek UART APDMA controller provides DMA capabilities
> +  for the UART peripheral bus.
> +
> +allOf:
> +  - $ref: "dma-controller.yaml#"
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - mediatek,mt2712-uart-dma
> +              - mediatek,mt8516-uart-dma
> +          - const: mediatek,mt6577-uart-dma
> +      - enum:
> +          - mediatek,mt6577-uart-dma
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 16
> +
> +  interrupts:
> +    description: |
> +      TX, RX interrupt lines for each UART APDMA channel
> +    minItems: 1
> +    maxItems: 16
> +
> +  clocks:
> +    description: Must contain one entry for the APDMA main clock
> +    maxItems: 1
> +
> +  clock-names:
> +    const: apdma
> +
> +  "#dma-cells":
> +    const: 1
> +    description: |
> +      The first cell specifies the UART APDMA channel number
> +
> +  dma-requests:
> +    description: |
> +      Number of virtual channels of the UART APDMA controller
> +    maximum: 16
> +
> +  mediatek,dma-33bits:
> +    type: boolean
> +    description: Enable 33-bits UART APDMA support
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +if:
> +  not:
> +    anyOf:

Thanks for the changes. This "anyOf" you can skip. It was needed in that
example because multiple properties should trigger restriction of maxItems.

In your case it is sufficient:
if:

  not:

    required:

      - dma-requests

then:
....


Rest looks good.

> +      - required:
> +          - dma-requests
> +then:
> +  properties:
> +    interrupts:
> +      maxItems: 8


Best regards,
Krzysztof