Alexandre Courbot a1eabac6e2
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: Alexandre Courbot <acourbot@nvidia.com >
Reported-by: Dr. H. Nikolaus Schaller <hns@goldelico.com >
Signed-off-by: Linus Walleij <linus.walleij@linaro.org >
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a1eabac6e2