Messages in this thread | | | Subject | Re: [RFC] ARM DMA mapping TODO, v1 | From | Benjamin Herrenschmidt <> | Date | Thu, 28 Apr 2011 07:41:07 +1000 |
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> As I said above, I don't think bus code can do it. Take my example > above of a tulip pci device on x86 and a tulip pci device on ARM. Both > use the same PCI code. > > Maybe something in asm/pci.h - but that invites having lots of bus > specific header files in asm/. > > A better solution imho would be to have an architecture callback for > struct device which gets registered, which can inspect the type of > the device, and set the flag depending on where it appears in the > tree.
Now -that's gross :-)
For PCI you can have the flag propagate from the PHB down, for busses without a bus type (platform) then whoever instanciate them (the platform code) can set that appropriately.
Ben.
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