linux-kernel - Re: [RFC][PATCH] regmap: Drop CONFIG

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Message-ID: <20190626111508.GA5316@sirena.org.uk>
Date:   Wed, 26 Jun 2019 12:15:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [RFC][PATCH] regmap: Drop CONFIG_64BIT checks from core

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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