Re: regmap: Question about devices with unequal register sizes

From: Mark Brown
Date: Sun Feb 17 2013 - 11:23:52 EST

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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