linux-kernel - Re: [PATCH 0/3] dmaengine: ti-dma-crossbar: Support for eDMA

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Date:	Fri, 5 Jun 2015 19:17:17 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, Tony Lindgren <tony@...mide.com>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dmaengine@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<misael.lopez@...com>
Subject: Re: [PATCH 0/3] dmaengine: ti-dma-crossbar: Support for eDMA

On 06/05/2015 06:34 PM, Peter Ujfalusi wrote:
> Hi,
> 
> The ti-dma-crossbar driver in it's current form can work when it is used with
> sDMA (omap-dma). On DRA7x class of devices we have both sDMA and eDMA available.
> The DT bindings for sDMA has been done in a way that DMA users need to specify
> the required DMA request number + 1 when they request for channel and the driver
> stack has been written in this way also for sDMA.
> Since right now we do not have the crossbar enabled we can still change the
> compatible string to reflect the crossbar use. The TRM also refers the crossbars
> in this way.

Now that I have sent this series...
Would it be better to not touch the compatible strings, but add of_device_id
table in the ti-dma-crossbar driver containing the supported dma controllers,
like "ti,omap4430-sdma" and "ti,edma3" and to of_match_node() against the node
we got via dma-masters?

So we would keep the ti,dra7-dma-crossbar and depending on where the
dma-masters point us we can decide in the code on how to handle?

Just a thought.

> 
> Regards,
> Peter
> ---
> Misael Lopez Cruz (2):
>   dmaengine: ti-dma-crossbar: Make idr xbar instance-specific
>   dmaengine: ti-dma-crossbar: Add support for eDMA xbar
> 
> Peter Ujfalusi (1):
>   dmaengine: ti-dma-crossbar: Change the compatible string to
>     ti,dra7-sdma-crossbar
> 
>  Documentation/devicetree/bindings/dma/dma.txt      |  2 +-
>  .../devicetree/bindings/dma/ti-dma-crossbar.txt    |  5 +--
>  drivers/dma/ti-dma-crossbar.c                      | 37 ++++++++++++++++------
>  3 files changed, 31 insertions(+), 13 deletions(-)
> 


-- 
Péter
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