Re: [PATCH v6 1/2] dt-bindings: dma: Add Loongson-1 DMA

[Conor Dooley <conor@kernel.org>]

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On Sat, Mar 16, 2024 at 07:33:53PM +0800, Keguang Zhang via B4 Relay wrote:
> From: Keguang Zhang <keguang.zhang@gmail.com>
> 
> Add devicetree binding document for Loongson-1 DMA.
> 
> Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
> ---
> V5 -> V6:
>    Change the compatible to the fallback
>    Some minor fixes
> V4 -> V5:
>    A newly added patch
> ---
>  .../devicetree/bindings/dma/loongson,ls1x-dma.yaml | 66 ++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
> 
> 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..06358df725c6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/loongson,ls1x-dma.yaml
> @@ -0,0 +1,66 @@
> +# 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@gmail.com>
> +
> +description:
> +  Loongson-1 DMA controller provides 3 independent channels for
> +  peripherals such as NAND and AC97.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: loongson,ls1b-dma
> +      - items:
> +          - enum:
> +              - loongson,ls1c-dma
> +          - const: loongson,ls1b-dma

Aren't there several more devices in this family? Do they not have DMA
controllers?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: Each channel has a dedicated interrupt line.
> +    minItems: 1
> +    maxItems: 3

Is this number not fixed for each SoC?

> +  interrupt-names:
> +    minItems: 1
> +    items:
> +      - pattern: ch0
> +      - pattern: ch1
> +      - pattern: ch2

Why have you made these a pattern? There's no regex being used here at
all.

Cheers,
Cono4.

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