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In order to avoid lockdep boilerplate in individual drivers, turn the gpiochip_add_data() function into a macro that creates a unique class key for each driver. Note that this has the slight disadvantage of adding a key for each driver registered with the system. However, these keys are 8 bytes in size, which is negligible and a small price to pay for generic infrastructure. Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Grygorii Strashko <grygorii.strashko@ti.com> [renane __gpiochip_add_data() to gpiochip_add_data_with_key] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>