gpio: sysfs interface

[safe/jmp/linux-2.6] / drivers / gpio / Kconfig

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index fced190..6ec0e35 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -23,6 +23,21 @@ config DEBUG_GPIO
          slower.  The diagnostics help catch the type of setup errors
          that are most common when setting up new platforms or boards.
 
+config GPIO_SYSFS
+       bool "/sys/class/gpio/... (sysfs interface)"
+       depends on SYSFS && EXPERIMENTAL
+       help
+         Say Y here to add a sysfs interface for GPIOs.
+
+         This is mostly useful to work around omissions in a system's
+         kernel support.  Those are common in custom and semicustom
+         hardware assembled using standard kernels with a minimum of
+         custom patches.  In those cases, userspace code may import
+         a given GPIO from the kernel, if no kernel driver requested it.
+
+         Kernel drivers may also request that a particular GPIO be
+         exported to userspace; this can be useful when debugging.
+
 # put expanders in the right section, in alphabetical order
 
 comment "I2C GPIO expanders:"