Re: [PATCH 0/5] ARM: PrimeCell DMA patches v4

[Grant Likely <grant.likely@secretlab.ca>]

On Tue, Mar 30, 2010 at 3:57 AM, Linus WALLEIJ
<linus.walleij@stericsson.com> wrote:
> [Self]
>
>> This is a fourth iteration of the PrimeCell DMA API on top of the
>> generic DMA devices (sibling to the DMA engine). It's based on
>> the suggestion from Russell to try and define a specific extension
>> subset for DMA devices.
>
> Russell & Grant can you give some hint on the direction you
> see for this patch set?
>
> The problem we're facing is that next I will start adding DMA
> support for the U8500 and the MMCI derivate found in that platform
> doesn't *have* a PIO IRQ, which means the system cannot even
> boot without some solid DMA framework in place. (It is currently
> unbootable from the released kernels.)
>
> So unless there is some outstanding issue with this approach
> we pretty much need this now to keep working on mainlining
> the U8500.
>
> I would very much like to have the DMA patches for PrimeCell
> support pushed through Dan's tree, but that requires your ACKs
> of course, and it will inevitably collide with other PrimeCell
> patches for the next merge window (many submitted by myself
> admittedly).
>
> I can feed all the PrimeCell stuff to Dan if all agree that this
> is a good approach. Another approach is to apply the latest
> patches from Dan's tree to ARM and SPI alike and then feed
> the PrimeCell stuff through the ARM tree.

I have no objections to the SPI driver getting merged via Dan's tree.

g.