gpiolib: Provide to_gpio_device() helper
Provide to_gpio_device() helper which can be utilized in the existing and future code. While at it, make sure it becomes no-op at compilation time. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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