usb: ulpi: Add resource-managed variant of otg_ulpi_create()

Now drivers (like NVIDIA Tegra USB PHY for example) will be able to
benefit from the resource-managed variant, making driver's code a bit
cleaner.
Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-11-digetx@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-ulpi.c

@@ -240,6 +240,21 @@ static int ulpi_set_vbus(struct usb_otg *otg, bool on)
 	return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
 }
 
+static void otg_ulpi_init(struct usb_phy *phy, struct usb_otg *otg,
+			  struct usb_phy_io_ops *ops,
+			  unsigned int flags)
+{
+	phy->label	= "ULPI";
+	phy->flags	= flags;
+	phy->io_ops	= ops;
+	phy->otg	= otg;
+	phy->init	= ulpi_init;
+
+	otg->usb_phy	= phy;
+	otg->set_host	= ulpi_set_host;
+	otg->set_vbus	= ulpi_set_vbus;
+}
+
 struct usb_phy *
 otg_ulpi_create(struct usb_phy_io_ops *ops,
 		unsigned int flags)
@@ -257,17 +272,32 @@ otg_ulpi_create(struct usb_phy_io_ops *ops,
 		return NULL;
 	}
 
-	phy->label	= "ULPI";
-	phy->flags	= flags;
-	phy->io_ops	= ops;
-	phy->otg	= otg;
-	phy->init	= ulpi_init;
-
-	otg->usb_phy	= phy;
-	otg->set_host	= ulpi_set_host;
-	otg->set_vbus	= ulpi_set_vbus;
+	otg_ulpi_init(phy, otg, ops, flags);
 
 	return phy;
 }
 EXPORT_SYMBOL_GPL(otg_ulpi_create);
 
+struct usb_phy *
+devm_otg_ulpi_create(struct device *dev,
+		     struct usb_phy_io_ops *ops,
+		     unsigned int flags)
+{
+	struct usb_phy *phy;
+	struct usb_otg *otg;
+
+	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return NULL;
+
+	otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		devm_kfree(dev, phy);
+		return NULL;
+	}
+
+	otg_ulpi_init(phy, otg, ops, flags);
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(devm_otg_ulpi_create);

include/linux/usb/ulpi.h

@@ -55,12 +55,23 @@
 #if IS_ENABLED(CONFIG_USB_ULPI)
 struct usb_phy *otg_ulpi_create(struct usb_phy_io_ops *ops,
 					unsigned int flags);
+
+struct usb_phy *devm_otg_ulpi_create(struct device *dev,
+				     struct usb_phy_io_ops *ops,
+				     unsigned int flags);
 #else
 static inline struct usb_phy *otg_ulpi_create(struct usb_phy_io_ops *ops,
 					      unsigned int flags)
 {
 	return NULL;
 }
+
+static inline struct usb_phy *devm_otg_ulpi_create(struct device *dev,
+						   struct usb_phy_io_ops *ops,
+						   unsigned int flags)
+{
+	return NULL;
+}
 #endif
 
 #ifdef CONFIG_USB_ULPI_VIEWPORT