4 files changed, 79 insertions, 4 deletions
diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index 06f8d29..797e3fd 100644
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -28,6 +28,35 @@ config USB_MUSB_HDRC
 if USB_MUSB_HDRC
 
 choice
+	bool "MUSB Mode Selection"
+	default USB_MUSB_DUAL_ROLE if (USB && USB_GADGET)
+	default USB_MUSB_HOST if (USB && !USB_GADGET)
+	default USB_MUSB_GADGET if (!USB && USB_GADGET)
+
+config USB_MUSB_HOST
+	bool "Host only mode"
+	depends on USB
+	help
+	  Select this when you want to use MUSB in host mode only,
+	  thereby the gadget feature will be regressed.
+
+config USB_MUSB_GADGET
+	bool "Gadget only mode"
+	depends on USB_GADGET
+	help
+	  Select this when you want to use MUSB in gadget mode only,
+	  thereby the host feature will be regressed.
+
+config USB_MUSB_DUAL_ROLE
+	bool "Dual Role mode"
+	depends on (USB && USB_GADGET)
+	help
+	  This is the default mode of working of MUSB controller where
+	  both host and gadget features are enabled.
+
+endchoice
+
+choice
 	prompt "Platform Glue Layer"
 
 config USB_MUSB_DAVINCI
diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
index 3b85871..2b82ed7 100644
--- a/drivers/usb/musb/Makefile
+++ b/drivers/usb/musb/Makefile
@@ -6,8 +6,8 @@ obj-$(CONFIG_USB_MUSB_HDRC) += musb_hdrc.o
 
 musb_hdrc-y := musb_core.o
 
-musb_hdrc-y					+= musb_gadget_ep0.o musb_gadget.o
-musb_hdrc-y					+= musb_virthub.o musb_host.o
+musb_hdrc-$(CONFIG_USB_MUSB_HOST)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_virthub.o musb_host.o
+musb_hdrc-$(CONFIG_USB_MUSB_GADGET)$(CONFIG_USB_MUSB_DUAL_ROLE) += musb_gadget_ep0.o musb_gadget.o
 musb_hdrc-$(CONFIG_DEBUG_FS)			+= musb_debugfs.o
 
 # Hardware Glue Layer
diff --git a/drivers/usb/musb/musb_gadget.h b/drivers/usb/musb/musb_gadget.h
index 75f821c..0314dfc 100644
--- a/drivers/usb/musb/musb_gadget.h
+++ b/drivers/usb/musb/musb_gadget.h
@@ -37,6 +37,7 @@
 
 #include <linux/list.h>
 
+#if IS_ENABLED(CONFIG_USB_MUSB_GADGET) || IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
 extern irqreturn_t musb_g_ep0_irq(struct musb *);
 extern void musb_g_tx(struct musb *, u8);
 extern void musb_g_rx(struct musb *, u8);
@@ -48,6 +49,26 @@ extern void musb_g_disconnect(struct musb *);
 extern void musb_gadget_cleanup(struct musb *);
 extern int musb_gadget_setup(struct musb *);
 
+#else
+static inline irqreturn_t musb_g_ep0_irq(struct musb *musb)
+{
+	return 0;
+}
+
+static inline void musb_g_tx(struct musb *musb, u8 epnum)	{}
+static inline void musb_g_rx(struct musb *musb, u8 epnum)	{}
+static inline void musb_g_reset(struct musb *musb)		{}
+static inline void musb_g_suspend(struct musb *musb)		{}
+static inline void musb_g_resume(struct musb *musb)		{}
+static inline void musb_g_wakeup(struct musb *musb)		{}
+static inline void musb_g_disconnect(struct musb *musb)		{}
+static inline void musb_gadget_cleanup(struct musb *musb)	{}
+static inline int musb_gadget_setup(struct musb *musb)
+{
+	return 0;
+}
+#endif
+
 enum buffer_map_state {
 	UN_MAPPED = 0,
 	PRE_MAPPED,
diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index e47035e..1ce6e4e 100644
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -39,8 +39,6 @@
 
 #define musb_to_hcd(MUSB) ((MUSB)->hcd)
 
-extern struct musb *hcd_to_musb(struct usb_hcd *);
-
 /* stored in "usb_host_endpoint.hcpriv" for scheduled endpoints */
 struct musb_qh {
 	struct usb_host_endpoint *hep;		/* usbcore info */
@@ -78,6 +76,9 @@ static inline struct musb_qh *first_qh(struct list_head *q)
 	return list_entry(q->next, struct musb_qh, ring);
 }
 
+
+#if IS_ENABLED(CONFIG_USB_MUSB_HOST) || IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
+extern struct musb *hcd_to_musb(struct usb_hcd *);
 extern irqreturn_t musb_h_ep0_irq(struct musb *);
 extern int musb_host_alloc(struct musb *);
 extern void musb_host_tx(struct musb *, u8);
@@ -90,6 +91,30 @@ extern void musb_host_rx(struct musb *, u8);
 extern void musb_root_disconnect(struct musb *musb);
 extern void musb_host_resume_root_hub(struct musb *musb);
 extern void musb_host_poke_root_hub(struct musb *musb);
+#else
+static inline struct musb *hcd_to_musb(struct usb_hcd *hcd)
+{
+	return NULL;
+}
+
+static inline irqreturn_t musb_h_ep0_irq(struct musb *musb)
+{
+	return 0;
+}
+
+static inline int musb_host_alloc(struct musb *musb)
+{
+	return 0;
+}
+
+static inline void musb_host_free(struct musb *musb)		{}
+static inline void musb_host_tx(struct musb *musb, u8 epnum)	{}
+static inline void musb_host_rx(struct musb *musb, u8 epnum)	{}
+static inline void musb_root_disconnect(struct musb *musb)	{}
+static inline void musb_host_resume_root_hub(struct musb *musb)	{}
+static inline void musb_host_poll_rh_status(struct musb *musb)	{}
+static inline void musb_host_poke_root_hub(struct musb *musb)	{}
+#endif
 
 struct usb_hcd;