• Charles Keepax's avatar
    gpio: arizona: Add support for GPIOs that need to be maintained · 27a49ed1
    Charles Keepax authored
    The Arizona devices only maintain the state of output GPIOs whilst the
    CODEC is active, this can cause issues if the CODEC suspends whilst
    something is relying on the state of one of its GPIOs. However, in
    many systems the CODEC GPIOs are used for audio related features
    and thus the state of the GPIOs is unimportant whilst the CODEC is
    suspended. Often keeping the CODEC resumed in such a system would
    incur a power impact that is unacceptable.
    Allow the user to select whether a GPIO output should keep the
    CODEC resumed, by adding a flag through the second cell of the GPIO
    specifier in device tree.
    Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
    Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
gpio-arizona.c 5.3 KB