usb: isp1760: Make HCD support optional

Enable compilation of the isp1760 driver in pure host mode, pure device
mode, or dual-role mode.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/isp1760/Kconfig

 config USB_ISP1760
 	tristate "NXP ISP 1760/1761 support"
-	depends on USB
+	depends on USB || USB_GADGET
 	help
 	  Say Y or M here if your system as an ISP1760 USB host controller
 	  or an ISP1761 USB dual-role controller.
@@ -14,9 +14,46 @@ config USB_ISP1760
 	  To compile this driver as a module, choose M here: the
 	  module will be called isp1760.
 
+config USB_ISP1760_HCD
+	bool
+
 config USB_ISP1761_UDC
-	boolean "NXP ISP1761 USB Device Controller"
-	depends on USB_ISP1760 && USB_GADGET
+	bool
+
+if USB_ISP1760
+
+choice
+	bool "ISP1760 Mode Selection"
+	default USB_ISP1760_DUAL_ROLE if (USB && USB_GADGET)
+	default USB_ISP1760_HOST_ROLE if (USB && !USB_GADGET)
+	default USB_ISP1760_GADGET_ROLE if (!USB && USB_GADGET)
+
+config USB_ISP1760_HOST_ROLE
+	bool "Host only mode"
+	depends on USB=y || USB=USB_ISP1760
+	select USB_ISP1760_HCD
+	help
+	  Select this if you want to use the ISP1760 in host mode only. The
+	  gadget function will be disabled.
+
+config USB_ISP1760_GADGET_ROLE
+	bool "Gadget only mode"
+	depends on USB_GADGET=y || USB_GADGET=USB_ISP1760
+	select USB_ISP1761_UDC
+	help
+	  Select this if you want to use the ISP1760 in peripheral mode only.
+	  The host function will be disabled.
+
+config USB_ISP1760_DUAL_ROLE
+	bool "Dual Role mode"
+	depends on USB=y || USB=USB_ISP1760
+	depends on USB_GADGET=y || USB_GADGET=USB_ISP1760
+	select USB_ISP1760_HCD
+	select USB_ISP1761_UDC
 	help
-	   The NXP ISP1761 is a dual-role high-speed USB host and device
-	   controller.
+	  Select this if you want to use the ISP1760 in both host and
+	  peripheral modes.
+
+endchoice
+
+endif

drivers/usb/isp1760/Makefile

-isp1760-y := isp1760-core.o isp1760-hcd.o isp1760-if.o
+isp1760-y := isp1760-core.o isp1760-if.o
+isp1760-$(CONFIG_USB_ISP1760_HCD) += isp1760-hcd.o
 isp1760-$(CONFIG_USB_ISP1761_UDC) += isp1760-udc.o
 
 obj-$(CONFIG_USB_ISP1760)	+= isp1760.o

drivers/usb/isp1760/isp1760-hcd.h

@@ -47,6 +47,7 @@ enum isp1760_queue_head_types {
 };
 
 struct isp1760_hcd {
+#ifdef CONFIG_USB_ISP1760_HCD
 	struct usb_hcd		*hcd;
 
 	u32 hcs_params;
@@ -64,8 +65,10 @@ struct isp1760_hcd {
 	unsigned		i_thresh;
 	unsigned long		reset_done;
 	unsigned long		next_statechange;
+#endif
 };
 
+#ifdef CONFIG_USB_ISP1760_HCD
 int isp1760_hcd_register(struct isp1760_hcd *priv, void __iomem *regs,
 			 struct resource *mem, int irq, unsigned long irqflags,
 			 struct device *dev);
@@ -73,5 +76,27 @@ void isp1760_hcd_unregister(struct isp1760_hcd *priv);
 
 int isp1760_init_kmem_once(void);
 void isp1760_deinit_kmem_cache(void);
+#else
+static inline int isp1760_hcd_register(struct isp1760_hcd *priv,
+				       void __iomem *regs, struct resource *mem,
+				       int irq, unsigned long irqflags,
+				       struct device *dev)
+{
+	return 0;
+}
+
+static inline void isp1760_hcd_unregister(struct isp1760_hcd *priv)
+{
+}
+
+static inline int isp1760_init_kmem_once(void)
+{
+	return 0;
+}
+
+static inline void isp1760_deinit_kmem_cache(void)
+{
+}
+#endif
 
 #endif /* _ISP1760_HCD_H_ */

drivers/usb/isp1760/isp1760-udc.h

@@ -62,7 +62,7 @@ struct isp1760_ep {
  * connected: Tracks gadget driver bus connection state
  */
 struct isp1760_udc {
-#if CONFIG_USB_ISP1761_UDC
+#ifdef CONFIG_USB_ISP1761_UDC
 	struct isp1760_device *isp;
 
 	int irq;
@@ -87,7 +87,7 @@ struct isp1760_udc {
 #endif
 };
 
-#if CONFIG_USB_ISP1761_UDC
+#ifdef CONFIG_USB_ISP1761_UDC
 int isp1760_udc_register(struct isp1760_device *isp, int irq,
 			 unsigned long irqflags);
 void isp1760_udc_unregister(struct isp1760_device *isp);