On 2/23/2012 4:51 PM, Nicolas Ferre wrote:

On 02/23/2012 11:03 AM, Cousson, Benoit :

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Salut Nico,

Coucou Benoit ;-)

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On 2/22/2012 11:59 AM, Nicolas Ferre wrote:

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On 01/27/2012 06:29 PM, Cousson, Benoit :

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Add some basic helpers to retrieve a DMA controller device_node
and the DMA request line number.

For legacy reason another API will export the DMA request number
into a Linux resource of type IORESOURCE_DMA.
This API is usable only on system with an unique DMA controller.

Hi,

I followed that discussion and I like very much the biding that Benoit
is proposing. It will help me a lot with my current work on Atmel DMA
controller.

If I understand correctly, some rework is needed before it can be
integrated in a stable git tree (I mean before we can base our work on
top of it). So, in the meantime, what should I do to help and make
things go forward? to be quite frank, I would be interested to have a
working DMA enabled device soon ;-)

Me too, but unfortunately, I was busy trying to add irq_domain and
fixing issues with SPARSE_IRQ on OMAP :-(

Been there, loved that ;-)

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Do you think that 3.4 is out of reach?

Maybe not, from the comments, it looks like we should add a .xlate
callback to allow any custom parsing of the DMA nodes attributes.

I'll be more than happy, if you can finalize that patch :-)

I will try to figure out what I can understand from the irq mechanism of
.xlate and try to see if I can implement it on top of your patch.

In fact that dma code is a big copy/paste of the of/gpio one and gpio 
was already managing .xlate function.
I removed it because I thought it was useless for the DMA :-)

You might just have to copy the original code...

I will keep you informed...

Thanks for the help,
Benoit