Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH] Axi-usb: Add support for 64-bit addressing. | Date | Mon, 18 Apr 2016 16:35:07 +0200 |
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On Monday 18 April 2016 09:29:09 Rob Herring wrote: > > Right, you don't need to know the exact bus width for determining the > register/descriptor set is 32 or 64 bit addesses. I'm fine with a > property for that, but if limiting the actual connected address bits is > needed, then dma-ranges should be used.
The other way round: dma-ranges is needed to allow 64-bit addressing, the default is to only allow 32-bit addressing (and arm64 has a known bug here, it just allows it anyway when it shouldn't).
Arnd
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