From 65d876564e989b63b0f769e0e06b9830db97b2d9 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 4 Sep 2013 14:17:08 +0200
Subject: [PATCH] gpio: return -ENOTSUPP if debounce cannot be set

It appears some drivers are using gpio_set_debounce()
opportunistically, i.e. without knowing whether it works or
not. (Example: input/keyboard/gpio_keys.c) to account for
this use case, return -ENOTSUPP and do not print any
warnings in this case.

Took a round over the other gpio_set_debounce() consumers
to make sure that none of them are relying on the returned
error code to be something specific.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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