BeagleBone pinmux helper

Authors:
Pantelis Antoniou <[email protected]>
Charles Steinkuehler <[email protected]>
Jason Kridner <[email protected]>
Robert Nelson <[email protected]>
Tobias Müller <[email protected]>
Matthijs van Duin <[email protected]>

This patch was derived from 19 commits:
https://github.com/RobertCNelson/linux-dev/tree/35e301ae8436e9f56f65bf1a7440021eda42f948/patches/drivers/ti/gpio

Signed-off-by: Robert Nelson <[email protected]>

Author: RobertCNelson

drivers/gpio/Kconfig

@@ -73,6 +73,20 @@ config GPIO_SYSFS
 	  Kernel drivers may also request that a particular GPIO be
 	  exported to userspace; this can be useful when debugging.
 
+config GPIO_OF_HELPER
+	bool "GPIO OF helper device (EXPERIMENTAL)"
+	depends on OF_GPIO
+	help
+	  Say Y here to add an GPIO OF helper driver
+
+	  Allows you specify a GPIO helper based on OF
+	  which allows simple export of GPIO functionality
+	  in user-space.
+
+	  Features include, value set/get, direction control,
+	  interrupt/value change poll support, event counting
+	  and others.
+
 config GPIO_GENERIC
 	depends on HAS_IOMEM # Only for IOMEM drivers
 	tristate

drivers/gpio/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_GPIOLIB)		+= gpiolib-devprop.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
 obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o
 obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
+obj-$(CONFIG_GPIO_OF_HELPER)	+= gpio-of-helper.o
 
 # Device drivers. Generally keep list sorted alphabetically
 obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o