Subject: [PATCH 8/8] ARM: omap_hsmmc: remove platform data dma_mask and initialization

From: [email-masked] (Tony Lindgren)
Date: Thu, 19 Apr 2012 11:07:42 -0700

* Russell King - ARM Linux <[email-masked]> [120419 10:46]:
> On Wed, Apr 18, 2012 at 06:39:14PM -0700, Tony Lindgren wrote:
> > Cool, you almost got it. Got it working for n800 and 770 with the following
> > patch. Only extremely light testing done now so careful with this patch too..
> > 
> > Had to hack in support for the src_port and dst_port that's needed for
> > omap_set_dma_src/dest_params on omap1.
> 
> What's the relationship between these ports and the DMA request signal?
> Is there a document which describes this?

It's the source and destination addresses bus port, so it's more related
to the addresses than request signal. I guess routing of the DMA request
signal is what it really does.

I'm now wondering if it might be possible to set it automatically based on
source and destination address.

There's some information in the omap5912 trm on pages 717 and 718:

http://www.ti.com/litv/pdf/spru742

It says for CSDP source port "This field identifies the port originator of
the transfer."

Regards,

Tony