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

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Message-ID: <CAJhJPsVT371gPN++UNK-cggb8uVxWqpJAoEbFGV8+syxfvnGAQ@mail.gmail.com>
Date:   Sat, 7 Oct 2023 13:45:23 +0800
From:   Keguang Zhang <keguang.zhang@...il.com>
To:     Conor Dooley <conor@...nel.org>
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

On Fri, Sep 29, 2023 at 12:42 AM Conor Dooley <conor@...nel.org> wrote:
>
> 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.
>
Will remove '|'.

> > +  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.
>
Got it. How about changing to one const?
  compatible:
    const: loongson,ls1-dma

> > +
> > +  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.
>
Will delete the description.

> > +    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.
>
Will delete the lablel.

> > +        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.
>
Will fix the indentation.

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



--
Best regards,

Keguang Zhang