linux-kernel - Re: [PATCH 2/3] dt-bindings: Add dma-channels for pdma device node

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Date:   Tue, 11 Jan 2022 09:56:45 +0800
From:   Zong Li <zong.li@...ive.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Bin Meng <bin.meng@...driver.com>,
        Green Wan <green.wan@...ive.com>, Vinod <vkoul@...nel.org>,
        dmaengine <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 2/3] dt-bindings: Add dma-channels for pdma device node

On Mon, Jan 10, 2022 at 5:00 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Zong,
>
> On Wed, Jan 5, 2022 at 6:44 AM Zong Li <zong.li@...ive.com> wrote:
> > Add dma-channels property, then we can determine how many channels there
> > by device tree, rather than statically defines it in PDMA driver
> >
> > Signed-off-by: Zong Li <zong.li@...ive.com>
>
> Thanks for your patch!
>
> > --- a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
> > +++ b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
> > @@ -34,12 +34,17 @@ properties:
> >      minItems: 1
> >      maxItems: 8
> >
> > +  dma-channels:
> > +    minimum: 1
> > +    maximum: 4
>
> As per my comment on [PATCH 3/3], perhaps you want to use a default
> value of 4, and document that here, too?
>

Thanks for your reminder, it should be modified as well. I would
change it and add a description in the next version.

> > +
> >    '#dma-cells':
> >      const: 1
> >
> >  required:
> >    - compatible
> >    - reg
> > +  - dma-channels
> >    - interrupts
> >    - '#dma-cells'
> >
>
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds