Messages in this thread | | | Date | Thu, 26 Feb 2015 22:58:53 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v2] coresight-stm: adding driver for CoreSight STM component |
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On Thu, Feb 26, 2015 at 04:24:53PM -0600, Rob Herring wrote: > We really shouldn't do private implementation here. It there really > any reason not to allow readq/writeq generically for 32-bit or just > for arm32?
My argument has always been that drivers should do the emulation of 64-bit accesses when there is no native support.
IO registers tend to have side effects when read/written. How do we know whether the low-half or the high-half should be written first? This isn't something that an architecture can really dictate. What may be right for one hardware device may not be correct for another.
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