usb: renesas_usbhs: add extcon notifier to set mode for non-otg channel

This patch adds extcon notifier callback to set the mode of
host/peripheral by using extcon state (e.g phy-rcar-gen3-usb2) for
non-otg channel (e.g. R-Car D3).

[Fengguang Wu: fixed sparse warning]
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

usb: renesas_usbhs: usbhs_rcar3_notifier() can be static

Fixes: 3a7cce26122e ("usb: renesas_usbhs: add extcon notifier to set mode for non-otg channel")
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/renesas_usbhs/common.c

@@ -581,6 +581,15 @@ static int usbhs_probe(struct platform_device *pdev)
 		break;
 	case USBHS_TYPE_RCAR_GEN3_WITH_PLL:
 		priv->pfunc = usbhs_rcar3_with_pll_ops;
+		if (!IS_ERR_OR_NULL(priv->edev)) {
+			priv->nb.notifier_call = priv->pfunc.notifier;
+			ret = devm_extcon_register_notifier(&pdev->dev,
+							    priv->edev,
+							    EXTCON_USB_HOST,
+							    &priv->nb);
+			if (ret < 0)
+				dev_err(&pdev->dev, "no notifier registered\n");
+		}
 		break;
 	default:
 		if (!info->platform_callback.get_id) {

drivers/usb/renesas_usbhs/common.h

@@ -249,6 +249,7 @@ struct usbhs_priv {
 	struct platform_device *pdev;
 
 	struct extcon_dev *edev;
+	struct notifier_block nb;
 
 	spinlock_t		lock;
 

drivers/usb/renesas_usbhs/rcar3.c

@@ -112,6 +112,16 @@ static int usbhs_rcar3_get_id(struct platform_device *pdev)
 	return USBHS_GADGET;
 }
 
+static int usbhs_rcar3_notifier(struct notifier_block *nb, unsigned long event,
+				void *data)
+{
+	struct usbhs_priv *priv = container_of(nb, struct usbhs_priv, nb);
+
+	usbhs_rcar3_set_usbsel(priv, !!event);
+
+	return NOTIFY_DONE;
+}
+
 const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
 	.power_ctrl = usbhs_rcar3_power_ctrl,
 	.get_id = usbhs_rcar3_get_id,
@@ -120,4 +130,5 @@ const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
 const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops = {
 	.power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
 	.get_id = usbhs_rcar3_get_id,
+	.notifier = usbhs_rcar3_notifier,
 };