Re: [RFC][PATCH] regmap: Drop CONFIG_64BIT checks from core

From: Mark Brown
Date: Wed Jun 26 2019 - 07:15:12 EST

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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