On Fri, Sep 21, 2012 at 07:47:21PM +0100, Russell King wrote: > On Fri, Sep 21, 2012 at 10:45:29PM +0530, S, Venkatraman wrote: > > On Thu, Sep 20, 2012 at 8:13 PM, Matt Porter <mpor...@ti.com> wrote: > > > The EDMA DMAC has a hardware limitation that prevents supporting > > > scatter gather lists with any number of segments. Since the EDMA > > > DMA Engine driver sets the maximum segments to 16, we do the > > > same. > > > > > > Note: this can be removed once the DMA Engine API supports an > > > API to query the DMAC's segment limitations. > > > > > > > I wouldn't want to bind the properties of EDMA to omap_hsmmc as this patch > > suggests. Why don't we have a max_segs property, which when explicitly > > specified > > in DT, will override the default ? > > Why not have a generic way that DMA engine can export these kinds of > properties?
That's exactly what my note above is suggesting... Something along the lines of: struct slave_sg_caps { int max_segs; /* <0 is no limit */ } struct slave_sg_cap * dmaengine_get_slave_sg_caps(struct dma_chan *chan); I'm sure there are or will be other characteristics worth providing to slave drivers. -Matt ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general