linux-kernel - Re: [PATCH 1/2] dt-bindings: dmaengine: add DT binding for UniPhier MIO DMAC

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Date:   Tue, 21 Aug 2018 16:14:31 +0530
From:   Jassi Brar <jaswinder.singh@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: dmaengine: add DT binding for UniPhier
 MIO DMAC

On 21 August 2018 at 15:17, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> (+CC Rob, DT, LKML)
>
> I forgot to CC this to DT community...
>
>
> 2018-08-21 18:30 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
>> The MIO DMAC (Media IO DMA Controller) is used in UniPhier LD4,
>> Pro4, and sLD8 SoCs.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>> ---
>>
>>  .../devicetree/bindings/dma/uniphier-mio-dmac.txt  | 28 ++++++++++++++++++++++
>>  1 file changed, 28 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt
>>
>> diff --git a/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt b/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt
>> new file mode 100644
>> index 0000000..a9e969e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/dma/uniphier-mio-dmac.txt
>> @@ -0,0 +1,28 @@
>> +UniPhier Media IO DMA controller
>> +
>> +This works as an external DMA engine for SD/eMMC controllers etc.
>> +found in UniPhier LD4, Pro4, sLD8 SoCs.
>> +
>> +Required properties:
>> +- compatible: should be "socionext,uniphier-mio-dmac".
>> +- reg: offset and length of the register set for the device.
>> +- interrupts: a list of interrupt specifiers associated with the DMA channels.
>> +- clocks: a single clock specifier
>> +- #dma-cells: should be <1>. The single cell represents the channel number.
>> +- dma-channels: specify the number of the DMA channels. This should match to
>> +  the number of tuples in the interrupts property.
>> +
Can we not infer the number of channels from interrupt tuples? After
all the driver assumes they are same.