Re: [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API

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On 07/31/2014 07:37 PM, Maxime Ripard wrote:
On Thu, Jul 31, 2014 at 06:54:11PM +0200, Lars-Peter Clausen wrote:
On 07/31/2014 06:13 PM, Maxime Ripard wrote:
[...]
 From what you're saying, and judging from the drivers that already
implement it, can't it be moved directly to the framework itself ?


What exactly do you mean by moving it directly to the framework? The
slave_caps API is part of the DMAengine framework.

Not its implementation, which is defined by each and every driver,
while the behaviour of device_slave_caps is rather generic.


Do you mean something like adding a dma_slave_caps struct field to the DMA channel that gets initialized when the channel is created and then remove the callback? That makes some sense.

I think the main reason why we use a callback right now is that in earlier revisions of the API it was possible to pass a slave_config and the result would be the capabilities of the DMA channel for this particular config. But this was dropped before the final version was merged upstream.

- Lars
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