diff --git a/Documentation/devicetree/bindings/usb/usb3503.txt b/Documentation/devicetree/bindings/usb/usb3503.txt
index 6813a71..8c5be48 100644
--- a/Documentation/devicetree/bindings/usb/usb3503.txt
+++ b/Documentation/devicetree/bindings/usb/usb3503.txt
@@ -4,6 +4,10 @@
 - compatible: Should be "smsc,usb3503".
 - reg: Specifies the i2c slave address, it should be 0x08.
 - connect-gpios: Should specify GPIO for connect.
+- disabled-ports: Should specify the ports unused.
+	'1' or '2' or '3' are availe for this property to describe the port
+	number. 1~3 property values are possible to be desribed.
+	Do not describe this property if all ports have to be enabled.
 - intn-gpios: Should specify GPIO for interrupt.
 - reset-gpios: Should specify GPIO for reset.
 - initial-mode: Should specify initial mode.
@@ -14,6 +18,7 @@
 		compatible = "smsc,usb3503";
 		reg = <0x08>;
 		connect-gpios = <&gpx3 0 1>;
+		disabled-ports = <2 3>;
 		intn-gpios = <&gpx3 4 1>;
 		reset-gpios = <&gpx3 5 1>;
 		initial-mode = <1>;
diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index ab24bb3..1908ec6 100644
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -186,6 +186,8 @@
 	struct usb3503 *hub;
 	int err = -ENOMEM;
 	u32 mode = USB3503_MODE_UNKNOWN;
+	const u32 *property;
+	int len;
 
 	hub = kzalloc(sizeof(struct usb3503), GFP_KERNEL);
 	if (!hub) {
@@ -203,6 +205,18 @@
 		hub->gpio_reset		= pdata->gpio_reset;
 		hub->mode		= pdata->initial_mode;
 	} else if (np) {
+		hub->port_off_mask = 0;
+
+		property = of_get_property(np, "disabled-ports", &len);
+		if (property && (len / sizeof(u32)) > 0) {
+			int i;
+			for (i = 0; i < len / sizeof(u32); i++) {
+				u32 port = be32_to_cpu(property[i]);
+				if ((1 <= port) && (port <= 3))
+					hub->port_off_mask |= (1 << port);
+			}
+		}
+
 		hub->gpio_intn	= of_get_named_gpio(np, "connect-gpios", 0);
 		if (hub->gpio_intn == -EPROBE_DEFER)
 			return -EPROBE_DEFER;