gpiolib: let gpio_chip reference its descriptors
Add a pointer to the gpio_chip structure that references the array of GPIO descriptors belonging to the chip, and update gpiolib code to use this pointer instead of the global gpio_desc[] array. This is another step towards the removal of the gpio_desc[] global array. Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com> Reviewed-by: NLinus Walleij <linus.walleij@linaro.orh> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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