gpio: gpio-pch: Use spinlock for register access protection
gpio_chip.can_sleep is 0, but current code uses mutex in pch_gpio_set pch_gpio_get and pch_gpio_direction_input functions. Thus those functions are not callable from interrupt context. This patch converts mutex into spinlock. Signed-off-by:Axel Lin <axel.lin@gmail.com> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org>
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