linux-kernel - Re: [PATCH v2 06/10] arm64: allwinner: a64: Add devicetree binding for DMA controller

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Date:   Sun, 24 Sep 2017 23:12:26 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stefan Bruens <stefan.bruens@...h-aachen.de>
Cc:     linux-sunxi <linux-sunxi@...glegroups.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        dmaengine@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Code Kipper <codekipper@...il.com>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v2 06/10] arm64: allwinner: a64: Add devicetree binding
 for DMA controller

On Sat, Sep 23, 2017 at 6:34 PM, Stefan Bruens
<stefan.bruens@...h-aachen.de> wrote:
> On Mittwoch, 20. September 2017 22:53:00 CEST Rob Herring wrote:
>> On Sun, Sep 17, 2017 at 05:19:52AM +0200, Stefan Brüns wrote:
>> > The A64 is register compatible with the H3, but has a different number
>> > of dma channels and request ports.
>> >
>> > Attach additional properties to the node to allow future reuse of the
>> > compatible for controllers with different number of channels/requests.
>> >
>> > If dma-requests is not specified, the register layout defined maximum
>> > of 32 is used.
>> >
>> > Signed-off-by: Stefan Brüns <stefan.bruens@...h-aachen.de>
>> > ---
>> >
>> >  .../devicetree/bindings/dma/sun6i-dma.txt          | 26
>> >  ++++++++++++++++++++++ 1 file changed, 26 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
>> > b/Documentation/devicetree/bindings/dma/sun6i-dma.txt index
>> > 98fbe1a5c6dd..6ebc79f95202 100644
>> > --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
>> > +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
>> >
>> > @@ -27,6 +27,32 @@ Example:
>> >             #dma-cells = <1>;
>> >
>> >     };
>> >
>> > +-------------------------------------------------------------------------
>> > ----- +For A64 DMA controller:
>> > +
>> > +Required properties:
>> > +- compatible:      "allwinner,sun50i-a64-dma"
>> > +- dma-channels: Number of DMA channels supported by the controller.
>> > +           Refer to Documentation/devicetree/bindings/dma/dma.txt
>> > +- all properties above, i.e. reg, interrupts, clocks, resets and
>> > #dma-cells +
>> > +Optional properties:
>> > +- dma-requests: Number of DMA request signals supported by the
>> > controller.
>> > +           Refer to Documentation/devicetree/bindings/dma/dma.txt
>> > +
>> > +Example:
>> > +   dma: dma-controller@...02000 {
>>
>> Drop the leading 0. Building dtbs with W=2 will tell you this.
>>
>> With that,
>>
>> Acked-by: Rob Herring <robh@...nel.org>
>
> The leading 0 was copied from the A31 example just a few lines above. Should I
> also correct that one, or should that go in a separate patch?

A separate patch.

Rob