If usb-role-switch property is present in USB 2 port, register
usb-role-switch to receive usb role changes.

Signed-off-by: Nagarjuna Kristam <redacted>
---
V3:
 - Driver aborts if usb-role-switch is not added in dt forotg/peripheral
   roles.
 - Added role name strings instead of enum values in debug prints.
 - Updated arguments and variable allignments as per Thierry inputs.
---
V2:
 - Removed dev_set_drvdata for port->dev.
 - Added of_platform_depopulate during error handling and driver removal.
---
 drivers/phy/tegra/Kconfig |  1 +
 drivers/phy/tegra/xusb.c  | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/phy/tegra/xusb.h  |  3 +++
 3 files changed, 61 insertions(+)

diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig
index f9817c3..df07c4d 100644
--- a/drivers/phy/tegra/Kconfig
+++ b/drivers/phy/tegra/Kconfig

@@ -2,6 +2,7 @@
 config PHY_TEGRA_XUSB
 	tristate "NVIDIA Tegra XUSB pad controller driver"
 	depends on ARCH_TEGRA
+	select USB_CONN_GPIO
 	help
 	  Choose this option if you have an NVIDIA Tegra SoC.
 

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index f98ec39..11ea9b5 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c

@@ -523,6 +523,7 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
 	port->dev.type = &tegra_xusb_port_type;
 	port->dev.of_node = of_node_get(np);
 	port->dev.parent = padctl->dev;
+	port->dev.driver = padctl->dev->driver;