>> OK. Sorry, I have one last question, because domain will be used to >> calculate the address used to >> access PCI hardware config registers. So if DTS file doesn't report the >> domain, how do we know >> we would access the right registers when we use the auto increment domain >> vaule ? >> Has there a mechanism to make sure system can access the correct registers >> by the domain ? > > I think you're referring to config access via ECAM (PCIe r3.0, sec > 7.2.2). In that case, I don't think the domain should be used to > compute the memory-mapped configuration address. Each host bridge is > in exactly one domain, and each host bridge has an associated ECAM > area base. The address calculation uses the bus number, device > number, function number, and register number to compute an offset into > the ECAM area. > > So as long as the DT tells you the ECAM information for each host > bridge, that should be sufficient. The domain number is then just a > Linux convenience and is not tied to the platform as it is on ia64.
Hi Bjorn, you are right, thanks for your detailed explanation! :) Thanks! Yijing. > > Bjorn > > . > -- Thanks! Yijing -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
