gpio: support native single-ended hardware drivers

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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: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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This commit is contained in:

Linus Walleij 2016-03-22 10:51:16 +01:00

parent 6e66a6599a

commit c663e5f567

2 changed files with 61 additions and 16 deletions

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include/linux/gpio/driver.h

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