On Wed, Jun 26, 2019 at 01:31:16AM +0200, Marek Vasut wrote: > Drop the CONFIG_64BIT checks from core regmap code, as it is well > possible to access e.g. an SPI device with 64bit registers from a > 32bit CPU. The CONFIG_64BIT checks are still left in place in the > regmap mmio code however.
The issue with 8 bit registers was that we use unsigned long for addresses and values and a 64 bit value won't fit in those on a 32 bit system. Some of the bulk APIs will work but things like individual register writes and the caches will have problems.
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