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When dynamically unloading overlays, it is important that freed pins are restored to being inputs to prevent functions from being enabled in multiple places at once. Cc: Stefan Wahren <stefan.wahren@i2se.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Phil Elwell <phil@raspberrypi.org> Acked-by: Eric Anholt <eric@anholt.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>