usb: dwc3: fix up for role switch API change

After merging the usb-gadget tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

drivers/usb/dwc3/drd.c: In function 'dwc3_setup_role_switch':
drivers/usb/dwc3/drd.c:551:23: error: assignment to 'usb_role_switch_set_t' {aka 'int (*)(struct usb_role_switch *, enum usb_role)'} from incompatible pointer type 'int (*)(struct device *, enum usb_role)' [-Werror=incompatible-pointer-types]
  551 |  dwc3_role_switch.set = dwc3_usb_role_switch_set;
      |                       ^
drivers/usb/dwc3/drd.c:552:23: error: assignment to 'usb_role_switch_get_t' {aka 'enum usb_role (*)(struct usb_role_switch *)'} from incompatible pointer type 'enum usb_role (*)(struct device *)' [-Werror=incompatible-pointer-types]
  552 |  dwc3_role_switch.get = dwc3_usb_role_switch_get;
      |                       ^

Caused by commit

  8a0a1379 ("usb: dwc3: Registering a role switch in the DRD code.")

interacting with commit

  bce3052f ("usb: roles: Provide the switch drivers handle to the switch in the API")

from the usb tree.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20200316143752.473f1073@canb.auug.org.auSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/drd.c

@@ -478,9 +478,10 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
 
 #if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
 #define ROLE_SWITCH 1
-static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
+static int dwc3_usb_role_switch_set(struct usb_role_switch *sw,
+				    enum usb_role role)
 {
-	struct dwc3 *dwc = dev_get_drvdata(dev);
+	struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
 	u32 mode;
 
 	switch (role) {
@@ -502,9 +503,9 @@ static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
 	return 0;
 }
 
-static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
+static enum usb_role dwc3_usb_role_switch_get(struct usb_role_switch *sw)
 {
-	struct dwc3 *dwc = dev_get_drvdata(dev);
+	struct dwc3 *dwc = usb_role_switch_get_drvdata(sw);
 	unsigned long flags;
 	enum usb_role role;
 
@@ -550,6 +551,7 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
 	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
 	dwc3_role_switch.set = dwc3_usb_role_switch_set;
 	dwc3_role_switch.get = dwc3_usb_role_switch_get;
+	dwc3_role_switch.driver_data = dwc;
 	dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
 	if (IS_ERR(dwc->role_sw))
 		return PTR_ERR(dwc->role_sw);