gpiolib: safer implementation of desc_to_gpio()
The current implementation of desc_to_gpio() relies on the chip pointer to be set to a valid value in order to compute the GPIO number. This was done in the hope that we can get rid of the gpio_desc global array, but this is not happening anytime soon. This patch reimplements desc_to_gpio() in a fashion similar to that of gpio_to_desc(). As a result, desc_to_gpio(gpio_to_desc(gpio)) == gpio is now always true. This allows to call desc_to_gpio() on non-initialized descriptors as some error-handling code currently does. Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com> Reported-by: NDr. H. Nikolaus Schaller <hns@goldelico.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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