phy: Add generic_{setup,shutdown}_phy() helpers

In drivers usb/host/{ehci,ohci}-generic.c, {ehci,ohci}_setup_phy() and
{ehci,ohci}_shutdown_phy() shares 95% of common code.
Factorize this code in new generic_{setup,shudown}_phy() functions.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/include/generic-phy.h b/include/generic-phy.h
index d40ce58..f8eddef 100644
--- a/include/generic-phy.h
+++ b/include/generic-phy.h
@@ -342,6 +342,26 @@
  */
 int generic_phy_power_off_bulk(struct phy_bulk *bulk);
 
+/**
+ * generic_setup_phy() - Get, initialize and power on phy.
+ *
+ * @dev:	The consumer device.
+ * @phy:	A pointer to the PHY port
+ * @index:	The index in the list of available PHYs
+ *
+ * Return: 0 if OK, or negative error code.
+ */
+int generic_setup_phy(struct udevice *dev, struct phy *phy, int index);
+
+/**
+ * generic_shutdown_phy() - Power off and de-initialize phy.
+ *
+ * @phy:	A pointer to the PHY port.
+ *
+ * Return: 0 if OK, or negative error code.
+ */
+int generic_shutdown_phy(struct phy *phy);
+
 #else /* CONFIG_PHY */
 
 static inline int generic_phy_init(struct phy *phy)
@@ -407,6 +427,16 @@
 	return 0;
 }
 
+static inline int generic_setup_phy(struct udevice *dev, struct phy *phy, int index)
+{
+	return 0;
+}
+
+static inline int generic_shutdown_phy(struct phy *phy)
+{
+	return 0;
+}
+
 #endif /* CONFIG_PHY */
 
 /**