* Franklin S Cooper Jr. <fcoo...@ti.com> [151014 07:37]: > > > On 10/14/2015 09:11 AM, Roger Quadros wrote: > > On 14/10/15 16:26, Franklin S Cooper Jr. wrote: > >> > >> On 10/14/2015 06:52 AM, Roger Quadros wrote: > >>> Franklin, > >>> > >>> On 14/10/15 14:36, Roger Quadros wrote: > >>>> On 13/10/15 04:38, Franklin S Cooper Jr wrote: > >>>>> Switch from dma_request_channel to allow passing dma channel > >>>>> information from DT rather than hardcoding a value. > >>>>> > >>>>> Signed-off-by: Franklin S Cooper Jr <fcoo...@ti.com> > >>>> Acked-by: Roger Quadros <rog...@ti.com> > >>>> > >>>>> --- > >>>>> drivers/mtd/nand/omap2.c | 4 +++- > >>>>> 1 file changed, 3 insertions(+), 1 deletion(-) > >>>>> > >>>>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c > >>>>> index d0f2620..957c32f 100644 > >>>>> --- a/drivers/mtd/nand/omap2.c > >>>>> +++ b/drivers/mtd/nand/omap2.c > >>>>> @@ -1866,7 +1866,9 @@ static int omap_nand_probe(struct platform_device > >>>>> *pdev) > >>>>> dma_cap_zero(mask); > >>>>> dma_cap_set(DMA_SLAVE, mask); > >>>>> sig = OMAP24XX_DMA_GPMC; > >>>>> - info->dma = dma_request_channel(mask, > >>>>> omap_dma_filter_fn, &sig); > >>>>> + info->dma = dma_request_slave_channel_compat(mask, > >>>>> + omap_dma_filter_fn, &sig, pdev->dev.parent, > >>>>> "rxtx"); > >>>>> + > >>> Just discovered that you are using the parent device node. > >>> > >>> How about moving the dma bindings to the nand node instead and using > >>> pdev->dev here? > >> Roger, > >> > >> From what I can tell the interrupt number and the dma channel will always > >> be > >> the same no matter what. Doesn't matter if you have multiple nands or a > >> combination of nands and nors. Since that is the case I think it just makes > >> sense to leave it in the gpmc parent node and define it once. > > Is prefetch/writepost dma used for NOR or any other GPMC peripheral > > or only for NAND? > The dma seems tied to the prefetch. From what I can tell the prefetch is only > used by nand. > > > > Let's also get Tony's inputs on this. > Sure.
Hmm so what would keep other devices from using the prefetch? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
