linux-kernel - Re: [PATCH 1/3] dt-bindings: k3dma: add optional property dma_min

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Date:   Fri, 6 Jul 2018 11:17:03 +0800
From:   Guodong Xu <guodong.xu@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     vkoul@...nel.org, Mark Rutland <mark.rutland@....com>,
        dan.j.williams@...el.com, liyu65@...ilicon.com,
        Suzhuangluan <suzhuangluan@...ilicon.com>,
        "xuhongtao (A)" <xuhongtao8@...ilicon.com>,
        zhongkaihua <zhongkaihua@...wei.com>,
        Xuezhiliang <xuezhiliang@...ilicon.com>,
        "xupeng (Q)" <xupeng7@...wei.com>, sunliang10@...wei.com,
        "Fengbaopeng (kevin, Kirin Solution Dept)" 
        <fengbaopeng@...ilicon.com>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: k3dma: add optional property dma_min_chan

On Wed, Jul 4, 2018 at 9:14 AM Guodong Xu <guodong.xu@...aro.org> wrote:
>
> On Wed, Jul 4, 2018 at 2:54 AM Rob Herring <robh@...nel.org> wrote:
> >
> > On Fri, Jun 22, 2018 at 11:24:14AM +0800, Guodong Xu wrote:
> > > From: Li Yu <liyu65@...ilicon.com>
> > >
> > > Add optional property dma_min_chan for k3dma.
> > >
> > > Signed-off-by: Li Yu <liyu65@...ilicon.com>
> > > ---
> > >  Documentation/devicetree/bindings/dma/k3dma.txt | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > >
> > > diff --git a/t b/Documentation/devicetree/bindings/dma/k3dma.txt
> > > index 4945aeac4dc4..2fa1370c3173 100644
> > > --- a/Documentation/devicetree/bindings/dma/k3dma.txt
> > > +++ b/Documentation/devicetree/bindings/dma/k3dma.txt
> > > @@ -12,6 +12,11 @@ Required properties:
> > >               have specific request line
> > >  - clocks: clock required
> > >
> > > +Optional properties:
> > > +- dma_min_chan: the minimum number of DMA channel which begin to use
> > > +             the default value is 0, but in some platform is
> > > +             configured 1, like hi3660 platform
> >
> > Can't this be implied by the compatible?
> >
>
> No. "hisilicon,k3-dma-1.0" can work with series of hisilicon kirin
> SoC. And each has different reservation of channels for on-chip
> coprocessors.
>
> > If not, needs vendor prefix and don't use '_' in property names.
> >
>
> Sure, thanks. Will change that when design new property. As Vinod
> suggested, it makes sense to change this to a mask.
>

After checking with Kirin SoC design team, I prefer to stay with
minimum channel number instead of mask. So, I will change this
property to:

hisilicon,dma-min-chan

-Guodong



>
> -Guodong
>
> > Rob