omap3: beaglexm: fix EHCI power up GPIO dir

EHCI enable power pin is inverted (active high) in comparison
to vanilla beagle which is active low. Handle this case conditionally.

Without this fix, Beagle XM 4 port EHCI will not function and no
networking will be available

[nm@ti.com: split up, added descriptive changelogs]
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NKoen Kooi <koen@beagleboard.org>
Signed-off-by: NTony Lindgren <tony@atomide.com>

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

@@ -297,9 +297,15 @@ static int beagle_twl_gpio_setup(struct device *dev,
 	gpio_request(gpio + 1, "EHCI_nOC");
 	gpio_direction_input(gpio + 1);
 
-	/* TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, active low) */
+	/*
+	 * TWL4030_GPIO_MAX + 0 == ledA, EHCI nEN_USB_PWR (out, XM active
+	 * high / others active low)
+	 */
 	gpio_request(gpio + TWL4030_GPIO_MAX, "nEN_USB_PWR");
-	gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
+	if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM)
+		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 1);
+	else
+		gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
 
 	/* TWL4030_GPIO_MAX + 1 == ledB, PMU_STAT (out, active low LED) */
 	gpio_leds[2].gpio = gpio + TWL4030_GPIO_MAX + 1;