usb: mtu3: add SPL support

MediaTek platforms may need the MTU3 controller before U-Boot proper is
available, but the driver is currently selected and built only with the
main U-Boot configuration symbols.

Add an explicit SPL controller option with host and gadget modes. Make
the driver build and its role checks phase-aware so each phase can select
the MTU3 role it needs without coupling it to the U-Boot proper controller
configuration.

The upstream binding locates the xHCI child registers through the parent
ranges property. Select SPL_OF_TRANSLATE for host mode so SPL can resolve
that address before mapping it.

Signed-off-by: Julien Masson <jmasson@baylibre.com>
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Reviewed-by: Marek Vasut <marek.vasut+usb@mailbox.org>

drivers/Makefile

@@ -66,7 +66,8 @@ obj-$(CONFIG_DRAM_SUN20I_D1) += ram/
 obj-$(CONFIG_SPL_DM_RESET) += reset/
 obj-$(CONFIG_SPL_MUSB_NEW) += usb/musb-new/
 obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/
-obj-$(CONFIG_SPL_USB_GADGET) += usb/common/
+obj-$(CONFIG_SPL_DM_USB) += usb/common/
+obj-$(CONFIG_SPL_USB_MTU3) += usb/mtu3/
 obj-$(CONFIG_SPL_USB_GADGET) += usb/gadget/udc/
 obj-$(CONFIG_SPL_WATCHDOG) += watchdog/
 obj-$(CONFIG_SPL_USB_HOST) += usb/host/

drivers/usb/mtu3/Kconfig

@@ -42,3 +42,42 @@ config USB_MTU3_DEBUG
 	  Say Y here to enable debugging messages in the MTU3 Driver.
 
 endif
+
+config SPL_USB_MTU3
+	bool "MediaTek USB3 controller support in SPL"
+	depends on ARCH_MEDIATEK
+	depends on SPL_DM_USB
+	depends on SPL_USB_HOST || (SPL_DM_USB_GADGET && SPL_USB_GADGET)
+	help
+	  Enable the MediaTek USB3 controller in SPL. Select host or peripheral
+	  mode below.
+
+if SPL_USB_MTU3
+
+choice
+	bool "MTU3 SPL Mode Selection"
+	default SPL_USB_MTU3_GADGET if SPL_USB_GADGET
+	default SPL_USB_MTU3_HOST if (SPL_USB_HOST && !SPL_USB_GADGET)
+	help
+	  Select whether the MTU3 controller operates as an xHCI host or a USB
+	  peripheral in SPL.
+
+config SPL_USB_MTU3_HOST
+	bool "Host mode in SPL"
+	depends on SPL_USB_HOST && USB_XHCI_HCD
+	select SPL_OF_TRANSLATE
+	help
+	  Enable the MTU3 xHCI host controller in SPL so USB devices can be
+	  accessed before U-Boot proper starts.
+
+config SPL_USB_MTU3_GADGET
+	bool "Gadget mode in SPL"
+	depends on SPL_DM_USB_GADGET && SPL_USB_GADGET
+	select USB_GADGET_DUALSPEED
+	help
+	  Enable the MTU3 peripheral controller in SPL so USB gadget
+	  functions can use it before U-Boot proper starts.
+
+endchoice
+
+endif

drivers/usb/mtu3/Makefile

@@ -1,11 +1,11 @@
 # SPDX-License-Identifier: GPL-2.0
 
-ccflags-$(CONFIG_USB_MTU3_DEBUG)	+= -DDEBUG
+ccflags-$(CONFIG_$(PHASE_)USB_MTU3_DEBUG)	+= -DDEBUG
 
-obj-$(CONFIG_USB_MTU3)	+= mtu3.o
+obj-$(CONFIG_$(PHASE_)USB_MTU3)	+= mtu3.o
 
 mtu3-y	:= mtu3_plat.o
 
-obj-$(CONFIG_USB_MTU3_GADGET)	+= mtu3_core.o mtu3_gadget_ep0.o mtu3_gadget.o
-obj-$(CONFIG_USB_MTU3_GADGET)	+= mtu3_qmu.o
-obj-$(CONFIG_USB_MTU3_HOST)	+= mtu3_host.o
+obj-$(CONFIG_$(PHASE_)USB_MTU3_GADGET) += mtu3_core.o mtu3_gadget_ep0.o
+obj-$(CONFIG_$(PHASE_)USB_MTU3_GADGET) += mtu3_gadget.o mtu3_qmu.o
+obj-$(CONFIG_$(PHASE_)USB_MTU3_HOST) += mtu3_host.o

drivers/usb/mtu3/mtu3_dr.h

@@ -10,7 +10,7 @@
 #ifndef _MTU3_DR_H_
 #define _MTU3_DR_H_
 
-#if IS_ENABLED(CONFIG_USB_MTU3_HOST)
+#if CONFIG_IS_ENABLED(USB_MTU3_HOST)
 
 int ssusb_host_init(struct ssusb_mtk *ssusb);
 void ssusb_host_exit(struct ssusb_mtk *ssusb);
@@ -27,7 +27,7 @@ static inline void ssusb_host_exit(struct ssusb_mtk *ssusb)
 
 #endif
 
-#if IS_ENABLED(CONFIG_USB_MTU3_GADGET)
+#if CONFIG_IS_ENABLED(USB_MTU3_GADGET)
 int ssusb_gadget_init(struct ssusb_mtk *ssusb);
 void ssusb_gadget_exit(struct ssusb_mtk *ssusb);
 irqreturn_t mtu3_irq(int irq, void *data);

drivers/usb/mtu3/mtu3_plat.c

@@ -439,17 +439,17 @@ static int mtu3_glue_bind(struct udevice *parent)
 
 	switch (dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
-		if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
+		if (CONFIG_IS_ENABLED(USB_MTU3_GADGET))
 			return mtu3_bind_gadget(parent);
 		break;
 	case USB_DR_MODE_HOST:
-		if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
+		if (CONFIG_IS_ENABLED(USB_MTU3_HOST))
 			return mtu3_bind_host(parent);
 		break;
 	case USB_DR_MODE_OTG:
-		if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
+		if (CONFIG_IS_ENABLED(USB_MTU3_GADGET))
 			return mtu3_bind_gadget(parent);
-		if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
+		if (CONFIG_IS_ENABLED(USB_MTU3_HOST))
 			return mtu3_bind_host(parent);
 		break;
 	default: