1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index e4b6985044a2..566edaa56a53 100644
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -555,6 +555,11 @@ requested using gpio_request():
         /* reverse gpio_export() */
         void gpio_unexport();
 
+        /* create a sysfs link to an exported GPIO node */
+        int gpio_export_link(struct device *dev, const char *name,
+                unsigned gpio)
+
+
 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
 signal direction may change.  This helps drivers prevent userspace code
@@ -563,3 +568,8 @@ from accidentally clobbering important system state.
 This explicit exporting can help with debugging (by making some kinds
 of experiments easier), or can provide an always-there interface that's
 suitable for documenting as part of a board support package.
+
+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.