• Linus Walleij's avatar
    gpio: support native single-ended hardware drivers · c663e5f5
    Linus Walleij authored
    Some GPIO controllers has a special hardware bit we can flip
    to support open drain / source. This means that on these hardwares
    we do not need to emulate OD/OS by setting the line to input
    instead of actively driving it high/low. Add an optional vtable
    callback to the driver set_single_ended() so that driver can
    implement this in hardware if they have it.
    We may need a pinctrl_gpio_set_config() call at some point to
    propagate this down to a backing pin control device on systems
    with split GPIO/pin control.
    Reported-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
    Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
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