From: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxxxxxxxx>
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 <ldewangan@xxxxxxxxxx>
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 <ldewangan@xxxxxxxxxx>
Reviwed-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxxxxxxxx>
---
backport/include/linux/compat-3.4.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/backport/include/linux/compat-3.4.h b/backport/include/linux/compat-3.4.h
index 0636499..eb557d9 100644
--- a/backport/include/linux/compat-3.4.h
+++ b/backport/include/linux/compat-3.4.h
@@ -12,6 +12,7 @@
#endif
#define EPROBE_DEFER 517 /* Driver requests probe retry */
+#define GPIOF_OPEN_DRAIN (1 << 2)
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
#include <linux/regmap.h>
--
1.7.10.4
--
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