From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Daniel Mack <zonque@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Subject: Re: regmap: Question about devices with unequal register sizes
Date: Sun, 17 Feb 2013 16:23:38 +0000 [thread overview]
Message-ID: <20130217162337.GB1583@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <511FBBF7.2020103@gmail.com>
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On Sat, Feb 16, 2013 at 06:03:51PM +0100, Daniel Mack wrote:
> The register layout is described on page 26, and they call their
> registers 'subaddresses'. Up to sub-address 0x1c, I see no problem
> mapping that to a simple 8-bit regmap layout, but above that, access
> gets trickier because registers change their sizes, which breaks the cache.
The regmap I/O code isn't making any effort to support such devices, the
hardware is just too crazy to worry about. The best you can do is use
the no-bus support and open code your physical I/O so you can still use
the cache.
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next prev parent reply other threads:[~2013-02-17 16:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-16 17:03 regmap: Question about devices with unequal register sizes Daniel Mack
2013-02-17 16:23 ` Mark Brown [this message]
2013-05-06 16:32 ` Daniel Mack
2013-05-06 19:36 ` Mark Brown
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