linux-kernel - Re: [PATCH v5 1/2] dt-bindings: dma: Add Loongson-1 DMA

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Date:   Thu, 28 Sep 2023 17:42:07 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Keguang Zhang <keguang.zhang@...il.com>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: dma: Add Loongson-1 DMA

Hey,

On Thu, Sep 28, 2023 at 08:19:52PM +0800, Keguang Zhang wrote:
> Add devicetree binding document for Loongson-1 DMA.
> 
> Signed-off-by: Keguang Zhang <keguang.zhang@...il.com>
> ---
> V4 -> V5:
>    A newly added patch
> 
>  .../bindings/dma/loongson,ls1x-dma.yaml       | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/loongson,ls1x-dma.yaml
> 
> diff --git a/Documentation/devicetree/bindings/dma/loongson,ls1x-dma.yaml b/Documentation/devicetree/bindings/dma/loongson,ls1x-dma.yaml
> new file mode 100644
> index 000000000000..51b45d998a58
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/loongson,ls1x-dma.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/loongson,ls1x-dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Loongson-1 DMA Controller
> +
> +maintainers:
> +  - Keguang Zhang <keguang.zhang@...il.com>
> +
> +description: |

This | isn't required as you have no formatting to preserve here.

> +  Loongson-1 DMA controller provides 3 independent channels for
> +  peripherals such as NAND and AC97.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - loongson,ls1b-dma
> +      - loongson,ls1c-dma

From a skim of the driver, these two devices seem to be compatible,
and therefore one should fall back to the other.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: Each channel has a dedicated interrupt line.
> +    minItems: 1
> +    maxItems: 3
> +
> +  interrupt-names:
> +    minItems: 1
> +    items:
> +      - pattern: ch0
> +      - pattern: ch1
> +      - pattern: ch2
> +
> +  '#dma-cells':
> +    description: The single cell represents the channel index.

This description is unnecessary.

> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-names
> +  - '#dma-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    dma: dma-controller@...01160 {

This label is unused.

> +        compatible = "loongson,ls1b-dma";
> +        reg = <0x1fd01160 0x18>;
> +
> +        interrupt-parent = <&intc0>;
> +        interrupts = <13 IRQ_TYPE_EDGE_RISING>,
> +        	     <14 IRQ_TYPE_EDGE_RISING>,
> +        	     <15 IRQ_TYPE_EDGE_RISING>;

Odd mixed indentation here. Bindings use spaces only.

Thanks,
Conor.

> +        interrupt-names = "ch0", "ch1", "ch2";
> +
> +        #dma-cells = <1>;
> +    };
> -- 
> 2.39.2
> 

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