On Sunday 02 October 2011 17:14:47 Russell King - ARM Linux wrote: > On Sun, Oct 02, 2011 at 04:45:45PM +0200, Arnd Bergmann wrote: > > The logic to allow only one DMA driver in MUSB is currently > > flawed, because it also allows picking no DMA driver at all > > and also not selecting PIO mode. > > > > Using a choice statement makes this foolproof for now and > > also simplifies the Makefile. > > > > Unfortunately, we will have to revisit this when we start > > supporting multiple ARM platforms in a single kernel binary, > > because at that point we will actually need to select > > multiple DMA drivers and pick the right one at run-time. > > I thought there was some work going on to convert this to use the > dmaengine stuff? That would certainly be the best solution here, I wasn't aware that it has already been discussed. Unfortunately, even with the dma parts out of the way there is a lot that needs to be done to make musb, ehci or ohci really cross-platform. Right now, you can only have one platform driver glue for each of those drivers, and they should eventually be converted to a large library module for the core, with independent platform driver front-end, similar to the recent conversion of the sdhci driver by Shawn Guo, and the way that a lot of the other common drivers work. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
