From: "Luis R. Rodriguez" <[email protected]> This functionality will just be ignored, later we'll just port the full gpiolib.
mcgrof@frijol ~/linux-stable (git::master)$ git describe --contains aca5ce14 v3.4-rc1~65^2~20 commit aca5ce14eb773a75e5d935968b2e390dc5bd29c3 Author: Laxman Dewangan <[email protected]> Date: Fri Feb 17 20:26:21 2012 +0530 gpio: gpiolib: Support for open drain/collector gpios Adding support for the open drain gpio on which client can specify the open drain property through GPIO flag GPIOF_OPEN_DRAIN at the time of gpio request. The open drain pins are normally pulled high and it cannot be driven to output with value of 1 and so when client request for setting the pin to HIGH, the gpio will be set to input direction to make pin in tristate and hence PULL-UP on pins will make the state to HIGH. The open drain pin can be driven to LOW by setting output with value of 0. Signed-off-by: Laxman Dewangan <[email protected]> Reviwed-by: Mark Brown <[email protected]> Acked-by: Linus Walleij <[email protected]> Signed-off-by: Grant Likely <[email protected]> Signed-off-by: Luis R. Rodriguez <[email protected]> --- backport/include/linux/compat-3.4.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/backport/include/linux/compat-3.4.h b/backport/include/linux/compat-3.4.h index a152d51..528ae09 100644 --- a/backport/include/linux/compat-3.4.h +++ b/backport/include/linux/compat-3.4.h @@ -11,6 +11,8 @@ #include <linux/kconfig.h> #endif +#define GPIOF_OPEN_DRAIN (1 << 2) + #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) #if defined(CONFIG_REGMAP) #include <linux/regmap.h> -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe backports" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
