diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2012-02-17 20:26:22 +0530 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-03-07 22:24:27 -0800 |
| commit | 806c13eb6bda41bdceb65ae7478b08965e1a4d5d (patch) | |
| tree | a5accce31e203137269d7f01d5e301c9b5adfad8 /include/linux/gpio.h | |
| parent | 38ca86e591ad3e80e21d40ff647622a85e110f95 (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>
cherry-picked from mainline commit
25553ff0756c59b617af6bdd280c94e943164184
Change-Id: I3062a5dec7bf745b624d9a147f79d3830927325b
Reviewed-on: http://git-master/r/88265
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Laxman Dewangan <ldewangan@nvidia.com>
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 8d3a8011f312..6e20df099279 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) + #ifdef CONFIG_GENERIC_GPIO #include <asm/gpio.h> |