From: Alexandre Courbot <acourbot@nvidia.com>
Date: Sat, 2 Feb 2013 16:29:24 +0000 (+0900)
Subject: gpiolib: link all gpio_chips using a list
X-Git-Tag: v3.9-rc1~76^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a989d0f1de8f5a150b35e1e8181cc1abc139162;p=pandora-kernel.git

gpiolib: link all gpio_chips using a list

Add a list member to gpio_chip that allows all chips to be parsed
quickly. The current method requires parsing the entire GPIO integer
space, which is painfully slow. Using a list makes many chip operations
that involve lookup or parsing faster, and also simplifies the code. It
is also necessary to eventually get rid of the global gpio_desc[] array.

The list of gpio_chips is always ordered by base GPIO number to ensure
chips traversal is done in the right order.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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