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

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Date:   Mon, 26 Jun 2017 14:33:31 -0500
From:   Rob Herring <robh@...nel.org>
To:     Pierre-Yves MORDRET <pierre-yves.mordret@...com>
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, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] dt-bindings: stm32-dma: Add property to handle
 STM32 DMAMUX

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