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

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Date: Mon, 18 Mar 2024 14:18:27 +0800
From: Keguang Zhang <keguang.zhang@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-mips@...r.kernel.org, dmaengine@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] dt-bindings: dma: Add Loongson-1 DMA

On Sun, Mar 17, 2024 at 10:40 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Sat, Mar 16, 2024 at 07:33:53PM +0800, Keguang Zhang via B4 Relay wrote:
> > From: Keguang Zhang <keguang.zhang@...il.com>
> >
> > Add devicetree binding document for Loongson-1 DMA.
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang@...il.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@...il.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?
>
You are right. Loongson1 is a SoC family.
However, only 1A/1B/1C have DMA controller.

> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    description: Each channel has a dedicated interrupt line.
> > +    minItems: 1
> > +    maxItems: 3
>
> Is this number not fixed for each SoC?
>
Yes. Actually, it's fixed for the whole family.

> > +  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.
>
Will change items to the following regex.
  interrupt-names:
    minItems: 1
    items:
      - pattern: "^ch[0-2]$"

Thanks!

> Cheers,
> Cono4.



-- 
Best regards,

Keguang Zhang