On Friday 21 June 2013, Joel A Fernandes wrote:
> Hi Arnd,
>
> On Fri, Jun 21, 2013 at 1:44 PM, Arnd Bergmann <a...@arndb.de> wrote:
> > On Friday 21 June 2013, Joel A Fernandes wrote:
> >> I think we are talking about different things, I agree the 'select
> >> DMADEVICES' can be dropped but lets please keep the default y option
> >> (not adding new select statements, just saying that if someone select
> >> DMADEVICES in menuconfig and if they're ARCH_OMAP=1 , then default to
> >> EDMA). This will simply allow people to have a default. Thanks.
> >
> > Yes, that's ok.
>
> Ok, thanks. I will follow up with a patch in my next submissions that builds
> it.
>
> Perhaps a:
> default y if 'ARCH_OMAP2PLUS'
>
> and leave the existing as it is...
> default n if 'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2'
>
> would make most sense to me. Basically EDMA is seen on current and all
> new OMAP2PLUS.
Ok
> > config TI_EDMA
> > tristate "TI EDMA support"
> > default m if 'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2
> > select DMA_ENGINE
> > select DMA_VIRTUAL_CHANNELS
>
>
> MMC depends on EDMA specially on AM33xx there's no PIO mode AFAIK. The
> 'm' option will require some initramfs to load the module when needing
> to MMC boot, I suggest lets leave it as y.
>
Ah, right: you still export a filter function from the edma driver
and use it in slave drivers:
drivers/mmc/host/davinci_mmc.c: dma_request_slave_channel_compat(mask,
edma_filter_fn,
drivers/mmc/host/davinci_mmc.c: dma_request_slave_channel_compat(mask,
edma_filter_fn,
drivers/spi/spi-davinci.c: dspi->dma_rx = dma_request_channel(mask,
edma_filter_fn,
drivers/spi/spi-davinci.c: dspi->dma_tx = dma_request_channel(mask,
edma_filter_fn,
As long as this is the case, you have to be careful with the dependencies
to make sure that davinci_mmc and spi-davinci either depend on TI_EDMA, or
edma_filter_fn gets defined to NULL when you are building for a DT-only
platform.
Arnd
_______________________________________________
devicetree-discuss mailing list
devicetree-discuss@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/devicetree-discuss
