[RFC PATCH v1 1/3] usb: phy: add usb mode for usb_phy

[Igor Opaniuk <igor.opaniuk@gmail.com>]

From: Igor Opaniuk <igor.opaniuk@toradex.com>

USB phy driver may need to know the current working mode of
the controller, and can provide different settings according to
host mode or device mode.

Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
---

 include/linux/usb/phy.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index e4de6bc1f69b..774941be77d7 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -63,6 +63,13 @@ enum usb_otg_state {
 	OTG_STATE_A_VBUS_ERR,
 };
 
+/* The usb role of phy to be working with */
+enum usb_current_mode {
+	USB_MODE_NONE,
+	USB_MODE_HOST,
+	USB_MODE_DEVICE,
+};
+
 struct usb_phy;
 struct usb_otg;
 
@@ -155,6 +162,13 @@ struct usb_phy {
 	 * manually detect the charger type.
 	 */
 	enum usb_charger_type (*charger_detect)(struct usb_phy *x);
+
+	/*
+	 * Set current working mode of the USB controller
+	 * (device, host)
+	 */
+	int	(*set_mode)(struct usb_phy *x,
+			enum usb_current_mode mode);
 };
 
 /* for board-specific init logic */
@@ -213,6 +227,15 @@ usb_phy_vbus_off(struct usb_phy *x)
 	return x->set_vbus(x, false);
 }
 
+static inline int
+usb_phy_set_mode(struct usb_phy *x, enum usb_current_mode mode)
+{
+	if (!x || !x->set_mode)
+		return 0;
+
+	return x->set_mode(x, mode);
+}
+
 /* for usb host and peripheral controller drivers */
 #if IS_ENABLED(CONFIG_USB_PHY)
 extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
-- 
2.17.1