On Fri, Jun 20, 2014 at 2:02 PM, Santosh Shilimkar <santosh.shilimkar@xxxxxx> wrote: > On Friday 20 June 2014 02:56 PM, Arnd Bergmann wrote: >> On Friday 20 June 2014 13:17:43 Santosh Shilimkar wrote: >>>>> + dma-coherent; >>>>> + dma-ranges; >>>>> + >>>>> + dwc3@2690000 { >>>>> + compatible = "synopsys,dwc3"; >>>>> + [...] >>>>> + }; >>>> >>>> This example is a bit strange. I don't understand the relationship >>>> between keystone-dwc3 and synopsys,dwc3, nor do I want to. I'd prefer >>>> to see a simple example here. >> >> >>>> dma-ranges is a property of the parent which you show, but >>>> dma-coherent originally was a property of the bus master itself. While >>>> we need to support that, are we changing that? We need to be clear on >>>> where the property belongs even if the kernel is more lax. >>>> >>> I don't think we are changing it fundamentally but may be I missing >>> your point. The dma-coherent as is now a per-device property. >>> USB is one of the bus master supports coherency and hence showed >>> up in above example. >> >> I think it's enough if you just drop the "synopsys,dwc3" node and the >> intermediate dma-ranges property from the example, leaving the >> dma-coherent property in the "ti,keystone-dwc3" node. >> > Thanks Arnd. That should avoid the confusion. Just to see if Rob is > fine by it, the example will look like below. Yes. Looks fine. Rob > > Example: > soc { > compatible = "ti,keystone","simple-bus"; > ranges = <0x0 0x0 0x0 0xc0000000>; > dma-ranges = <0x80000000 0x8 0x00000000 0x80000000>; > > [...] > > usb: usb@2680000 { > compatible = "ti,keystone-dwc3"; > > [...] > dma-coherent; > }; > }; > > Regards, > Santosh -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html