Re: [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API
From: Lars-Peter Clausen
Date: Fri Aug 01 2014 - 04:00:19 EST
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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