On 23/01/15 11:38, Chris Packham wrote: > > Hi Arnd, > > Thanks for the quick response (and sorry for the horribly formatted > message, travelling with only a webmail interface at the moment). > > On Fri, 23 Jan 2015, Arnd Bergmann wrote: > >> On Friday 23 January 2015 19:02:33 Chris Packham wrote: >>> Hi, >>> >>> I'm working on a new board that has a marvell,dsa switch. Similar to >>> the kirkwood-mv88f6281gtw-ge board. However the major difference is >>> that instead of being connected to an integrated Ethernet port it is >>> connected via a PCI-e Ethernet port (basically a NIC hardwired onto >>> the board). >>> >>> Generally you don't need to define PCI devices in the .dts because >>> the bus is scanned at run time and the method for identifying devices >>> is well defined. But to satisfy the marvell,dsa binding[1] I need to >>> tell it the Ethernet port it is connected to. The answer might be in >>> the PCI bindings but the urls in the documentation[2] don't appear to >>> be valid anymore. >>> >>> Is it possible to enumerate PCI devices in the .dts? Or is there a >>> way of satisfying the dsa requirements without knowing the Ethernet >>> device? >>> >> >> In general, it is possible, and we do that on PowerPC, but it may be that >> there are parts missing on ARM and you have to try it out. >> >> In particular, you need to know the address of the PCI device and then >> create a device node that will be associated with the >> pci_dev->dev.of_node >> pointer. > > Encouraging to know. I think I can figure out the relevant addresses for > my device based on the run-time scan. BTW, one thing that is high in my TODO list regarding DSA is to stop using this platform device/driver architecture and use the actual device driver model. Your switch driver entry point would be a pci_drive probe's function where you end-up registering a switch the DSA. This should solve portions of your problem although this is a long shot as we need to convert existing drivers as well. > > Can you think of a good example. I found a few ppc boards that have an > PCI-ISA bridge that get's enumerated in the .dts. I think I can make sense > of them but because they are bridges there's a lot of extra stuff for > the down stream devices. -- 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
