linux-kernel - Re: [PATCH v2 3/5] dt-bindings: stm32-dma: Add property to handle STM32 DMAMUX

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Date:   Tue, 27 Jun 2017 08:09:35 +0000
From:   Pierre Yves MORDRET <pierre-yves.mordret@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Vinod Koul <vinod.koul@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        "M'boumba Cedric Madianga" <cedric.madianga@...il.com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        Amelie DELAUNAY <amelie.delaunay@...com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] dt-bindings: stm32-dma: Add property to handle
 STM32 DMAMUX



On 06/26/2017 09:33 PM, Rob Herring wrote:
> On Fri, Jun 23, 2017 at 03:00:51PM +0200, Pierre-Yves MORDRET wrote:
>> This patch adds an optional property needed for STM32 DMA controller
>> addressed via STM32 DMAMUX.
>>
>> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
>> Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>
>> ---
>>   Version history:
>>      v2:
>>          * Typo fix
>> ---
>> ---
>>   Documentation/devicetree/bindings/dma/stm32-dma.txt | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/stm32-dma.txt b/Documentation/devicetree/bindings/dma/stm32-dma.txt
>> index 4408af6..340c918 100644
>> --- a/Documentation/devicetree/bindings/dma/stm32-dma.txt
>> +++ b/Documentation/devicetree/bindings/dma/stm32-dma.txt
>> @@ -16,6 +16,9 @@ Optional properties:
>>   - resets: Reference to a reset controller asserting the DMA controller
>>   - st,mem2mem: boolean; if defined, it indicates that the controller supports
>>     memory-to-memory transfer
>> +- st,dmamux: boolean; if defined, it indicates that the controller is behind a
>> +  DMA multiplexer. In that case, using dma instances doesn't work for DMA
>> +  clients. They have to use dma-router instances.
> 
> Won't this be obvious looking at the bindings for clients?
> 
> In any case, this should be implied by the compatible string.
> 
> Rob
> 

Not sure what you are asking here.

Py