On Mon, 2019-10-14 at 16:28 +0800, Shawn Guo wrote: > On Tue, Sep 24, 2019 at 08:12:38PM +0200, Nicolas Saenz Julienne wrote: > > qoriq-mc's dpmacs DMA configuration is inherited from their parent node, > > which acts a bus in this regard. So far it maked all devices as > > dma-coherent but no dma-ranges recommendation is made. > > > > The truth is that the underlying interconnect has DMA constraints, so > > add an empty dma-ranges in qoriq-mc's node in order for DT's DMA > > configuration code to get the DMA constraints from it. > > > > Signed-off-by: Nicolas Saenz Julienne > > Updated subject prefix as 'arm64: dts: ...', and applied the patch. Hi Shawn, these two patches are no longer needed. This series has been superseded by this patch[1] 951d48855d ('of: Make of_dma_get_range() work on bus nodes', available in linux-next) which fixed the issue directly in OF code. Sorry for the noise. Regards, Nicolas [1] https://lkml.org/lkml/2019/10/8/870