ngw100: export J15 through sysfs

The NGW100 board has jumper J15 (near the reset button) which
is unused.  This patch exports it through the GPIO sysfs support
(as /sys/class/gpio/gpio62/value) so that it's easily queried
by boot scripts or whatever might want to know if the jumper
has been installed (value = 0) or not (value = 1, "default").

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
[haavard.skinnemoen@atmel.com: add missing include]
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/avr32/boards/atngw100/setup.c b/arch/avr32/boards/atngw100/setup.c
index b8286f1ce854..abcb0d9559b1 100644
--- a/arch/avr32/boards/atngw100/setup.c
+++ b/arch/avr32/boards/atngw100/setup.c
@@ -9,6 +9,7 @@
  */
 #include <linux/clk.h>
 #include <linux/etherdevice.h>
+#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/i2c.h>
 #include <linux/i2c-gpio.h>
@@ -204,6 +205,15 @@ postcore_initcall(atngw100_init);
 
 static int __init atngw100_arch_init(void)
 {
+        /* PB30 is the otherwise unused jumper on the mainboard, with an
+         * external pullup; the jumper grounds it.  Use it however you
+         * like, including letting U-Boot or Linux tweak boot sequences.
+         */
+        at32_select_gpio(GPIO_PIN_PB(30), 0);
+        gpio_request(GPIO_PIN_PB(30), "j15");
+        gpio_direction_input(GPIO_PIN_PB(30));
+        gpio_export(GPIO_PIN_PB(30), false);
+
         /* set_irq_type() after the arch_initcall for EIC has run, and
          * before the I2C subsystem could try using this IRQ.
          */