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/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_ */