Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[mv-sheeva.git] / Documentation / gpio.txt

diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index e4e7daed2ba88dc2dbf7d0bf9c9eb16037e3e6c7..1866c27eec693e7e88f7420e3ac895079cba02d9 100644 (file)
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -531,6 +531,13 @@ and have the following read/write attributes:
                This file exists only if the pin can be configured as an
                interrupt generating input pin.
 
                This file exists only if the pin can be configured as an
                interrupt generating input pin.
 

+       "active_low" ... reads as either 0 (false) or 1 (true).  Write
+               any nonzero value to invert the value attribute both
+               for reading and writing.  Existing and subsequent
+               poll(2) support configuration via the edge attribute
+               for "rising" and "falling" edges will follow this
+               setting.
+

 GPIO controllers have paths like /sys/class/gpio/gpiochip42/ (for the
 controller implementing GPIOs starting at #42) and have the following
 read-only attributes:
 GPIO controllers have paths like /sys/class/gpio/gpiochip42/ (for the
 controller implementing GPIOs starting at #42) and have the following
 read-only attributes:


@@ -566,6 +573,8 @@ requested using gpio_request():
        int gpio_export_link(struct device *dev, const char *name,
                unsigned gpio)
 
        int gpio_export_link(struct device *dev, const char *name,
                unsigned gpio)
 

+       /* change the polarity of a GPIO node in sysfs */
+       int gpio_sysfs_set_active_low(unsigned gpio, int value);

 
 After a kernel driver requests a GPIO, it may only be made available in
 the sysfs interface by gpio_export().  The driver can control whether the
 
 After a kernel driver requests a GPIO, it may only be made available in
 the sysfs interface by gpio_export().  The driver can control whether the


@@ -580,3 +589,9 @@ After the GPIO has been exported, gpio_export_link() allows creating
 symlinks from elsewhere in sysfs to the GPIO sysfs node.  Drivers can
 use this to provide the interface under their own device in sysfs with
 a descriptive name.
 symlinks from elsewhere in sysfs to the GPIO sysfs node.  Drivers can
 use this to provide the interface under their own device in sysfs with
 a descriptive name.

+
+Drivers can use gpio_sysfs_set_active_low() to hide GPIO line polarity
+differences between boards from user space.  This only affects the
+sysfs interface.  Polarity change can be done both before and after
+gpio_export(), and previously enabled poll(2) support for either
+rising or falling edge will be reconfigured to follow this setting.