diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2012-02-17 20:26:22 +0530 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-03-05 07:49:44 -0700 |
| commit | 25553ff0756c59b617af6bdd280c94e943164184 (patch) | |
| tree | 6ca9ec045b5d2e10523fdf46facac59aa683f4ce /include/linux/gpio.h | |
| parent | aca5ce14eb773a75e5d935968b2e390dc5bd29c3 (diff) | |
gpio: gpiolib: Support for open source/emitter gpios
Adding support for the open source gpio on which client
can specify the open source property through GPIO flag
GPIOF_OPEN_SOURCE at the time of gpio request.
The open source pins are normally pulled low and it
cannot be driven to output with value of 0 and so
when client request for setting the pin to LOW, the
gpio will be set to input direction to make pin in tristate
and hence PULL-DOWN on pins will make the state to LOW.
The open source pin can be driven to HIGH by setting output
with value of 1.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/linux/gpio.h')
| -rw-r--r-- | include/linux/gpio.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 66a5b2e9d35..67851bbd3a4 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -17,6 +17,9 @@ /* Gpio pin is open drain */ #define GPIOF_OPEN_DRAIN (1 << 2) +/* Gpio pin is open source */ +#define GPIOF_OPEN_SOURCE (1 << 3) + /** * struct gpio - a structure describing a GPIO with configuration * @gpio: the GPIO number |