support LED signals on Beagle

Export Beagle's third LED to the LED framework, now that it's
accessible through the twl4030-gpio code.

Claim the VBUS control, defaulting to OFF.  Boards that have an
EHCI connector (not rev B) will need to update this slightly.
(Ideally as part of adding hooks to the ehci-map code supporting
external power switching and overcurrent detection.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-omap3beagle.c

@@ -115,19 +115,26 @@ static struct twl4030_usb_data beagle_usb_data = {
 	.usb_mode	= T2_USB_MODE_ULPI,
 };
 
+static struct gpio_led gpio_leds[];
+
 static int beagle_twl_gpio_setup(struct device *dev,
 		unsigned gpio, unsigned ngpio)
 {
-	/* request_gpio(gpio + 0, "mmc0_cd");
-	 * gpio_direction_input(gpio + 0);
+	/* gpio + 0 is "mmc0_cd" (input/IRQ) */
+
+	/* REVISIT: need ehci-omap hooks for external VBUS
+	 * power switch and overcurrent detect
 	 */
 
 	gpio_request(gpio + 1, "EHCI_nOC");
 	gpio_direction_input(gpio + 1);
 
-	/* gpio + 18 + 0 == ledA, nEN_USB_PWR (out)
-	 * gpio + 18 + 1 == ledB, PMU_STAT (out, a LED)
-	 */
+	/* TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, active low) */
+	gpio_request(gpio + TWL4030_GPIO_MAX, "nEN_USB_PWR");
+	gpio_direction_output(gpio + TWL4030_GPIO_MAX, 1);
+
+	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
+	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;
 
 	return 0;
 }
@@ -136,6 +143,7 @@ static struct twl4030_gpio_platform_data beagle_gpio_data = {
 	.gpio_base	= OMAP_MAX_GPIO_LINES,
 	.irq_base	= TWL4030_GPIO_IRQ_BASE,
 	.irq_end	= TWL4030_GPIO_IRQ_END,
+	.use_leds	= true,
 	.pullups	= BIT(1),
 	.pulldowns	= BIT(2) | BIT(6) | BIT(7) | BIT(8) | BIT(13)
 				| BIT(15) | BIT(16) | BIT(17),
@@ -198,6 +206,11 @@ static struct gpio_led gpio_leds[] = {
 		.default_trigger	= "mmc0",
 		.gpio			= 149,
 	},
+	{
+		.name			= "beagleboard::pmu_stat",
+		.gpio			= -EINVAL,	/* gets replaced */
+		.active_low		= true,
+	},
 };
 
 static struct gpio_led_platform_data gpio_led_info = {