[ARM] Orion5x: set valid GPIO inhibit power-off for d2net

This patch allow user-space to configure the switch power-off behaviour
via the gpiolib sysfs interface.
Signed-off-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

arch/arm/mach-orion5x/d2net-setup.c

@@ -301,6 +301,8 @@ static struct orion5x_mpp_mode d2net_mpp_modes[] __initdata = {
 	/* 24: Inhibit board power off (0 = Disabled, 1 = Enabled) */
 };
 
+#define D2NET_GPIO_INHIBIT_POWER_OFF    24
+
 static void __init d2net_init(void)
 {
 	/*
@@ -333,6 +335,8 @@ static void __init d2net_init(void)
 
 	i2c_register_board_info(0, d2net_i2c_devices,
 				ARRAY_SIZE(d2net_i2c_devices));
+
+	orion_gpio_set_valid(D2NET_GPIO_INHIBIT_POWER_OFF, 1);
 }
 
 /* Warning: LaCie use a wrong mach-type (0x20e=526) in their bootloader. */