On Wed, May 08, 2013 at 10:54:48AM +0800, Peter Chen wrote: > > > > This probably could be initialized from some DT property. However, > > there's no such property defined right now, and considering that DT is > > supposed to be an ABI, we'd always need the code in this patch as a > > fallback for DTs that were created before any such property was defined. > > > > Equally, since the data is SoC-specific rather than board-specific, and > > is even fairly unlikely to vary between SoC versions since these values > > are all 0xffffffff anyway, I don't really see much point in putting it > > into DT, rather than just putting the static data into the driver. > > I mean there is already dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); > at function of_platform_device_create, why can't add > dev->dev.dma_mask = &dev->dev.coherent_dma_mask after that? Because technically they're different things, and if we have a driver somewhere which uses the DMA API correctly by making use of dma_set_mask() and dma_set_coherent_mask(), the two will interfere with each other. These two masks have always been separate. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
