tree 5d1a3b1009d2ec1ee84abf3d2a120a46b4748f87
parent 0fa2fd9a0d4f1305a54a396d44975894e90eed7b
author Alexandre Courbot <acourbot@nvidia.com> 1359822564 +0900
committer Grant Likely <grant.likely@secretlab.ca> 1360401612 +0000

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>