linux-kernel - [PATCH] regmap: Add support for register paging

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Message-ID: <1336733724.5950.3.camel@sw-eng-lt-dc-vm2>
Date:	Fri, 11 May 2012 12:55:24 +0200
From:	Krystian Garbaciak <dd.diasemi@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org,
	Anthony Olech <Anthony.Olech@...semi.com>
Subject: [PATCH] regmap: Add support for register paging

Devices, having register map split into pages, can initialize regmap to
switch between pages automatically. This simply makes the total number
of registers to be virtually expanded and multiplied by number of pages.

When driver defines non-zero number of bits for page selection, register
address passed for read or write should consist of total number of page
bits and register bits to form an address, where page bits are the most
significant ones.

In order to make page switching efficient, register used for page
selection should be declared as cacheable (when possible). Driver can
define pageable and non-pageable (page independent) registers, so that
page switching will be carried out for pageable registers only.

Signed-off-by: Krystian Garbaciak <krystian.garbaciak@...semi.com>
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View attachment "regmap_paging.patch" of type "text/x-patch" (11675 bytes)