usb: fotg210: Collect pieces of dual mode controller

The Faraday FOTG210 is a dual-mode OTG USB controller that can
act as host, peripheral or both. To be able to probe from one
hardware description and to follow the pattern of other dual-
mode controllers such as MUSB or MTU3 we need to collect the
two, currently completely separate drivers in the same
directory.

After this, users need to select the main symbol USB_FOTG210
and then each respective subdriver. We pave the road to
compile both drivers into the same kernel and select the
one we want to use at probe() time, and possibly add OTG
support in the end.

This patch doesn't do much more than create the new symbol
and collect the drivers in one place. We also add a comment
for the section of dual-mode controllers in the Kconfig
file so people can see what these selections are about.

Also add myself as maintainer as there has been little
response on my patches to these drivers.

Cc: Fabian Vogt <fabian@ritter-vogt.de>
Cc: Yuan-Hsin Chen <yhchen@faraday-tech.com>
Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221023144708.3596563-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -7873,6 +7873,12 @@ F:	fs/notify/fanotify/
 F:	include/linux/fanotify.h
 F:	include/uapi/linux/fanotify.h
 
+FARADAY FOTG210 USB2 DUAL-ROLE CONTROLLER
+M:	Linus Walleij <linus.walleij@linaro.org>
+L:	linux-usb@vger.kernel.org
+S:	Maintained
+F:	drivers/usb/fotg210/
+
 FARSYNC SYNCHRONOUS DRIVER
 M:	Kevin Curtis <kevin.curtis@farsite.co.uk>
 S:	Supported

drivers/usb/Kconfig

@@ -111,8 +111,12 @@ source "drivers/usb/usbip/Kconfig"
 
 endif
 
+comment "USB dual-mode controller drivers"
+
 source "drivers/usb/cdns3/Kconfig"
 
+source "drivers/usb/fotg210/Kconfig"
+
 source "drivers/usb/mtu3/Kconfig"
 
 source "drivers/usb/musb/Kconfig"

drivers/usb/Makefile

@@ -17,6 +17,8 @@ obj-$(CONFIG_USB_CDNS_SUPPORT)	+= cdns3/
 obj-$(CONFIG_USB_CDNS3)		+= cdns3/
 obj-$(CONFIG_USB_CDNSP_PCI)	+= cdns3/
 
+obj-$(CONFIG_USB_FOTG210)	+= fotg210/
+
 obj-$(CONFIG_USB_MON)		+= mon/
 obj-$(CONFIG_USB_MTU3)		+= mtu3/
 

drivers/usb/fotg210/Kconfig

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config USB_FOTG210
+	tristate "Faraday FOTG210 USB2 Dual Role controller"
+	depends on USB || USB_GADGET
+	depends on HAS_DMA && HAS_IOMEM
+	default ARCH_GEMINI
+	help
+	  Faraday FOTG210 is a dual-mode USB controller that can act
+	  in both host controller and peripheral controller mode.
+
+if USB_FOTG210
+
+config USB_FOTG210_HCD
+	tristate "Faraday FOTG210 USB Host Controller support"
+	depends on USB
+	help
+	  Faraday FOTG210 is an OTG controller which can be configured as
+	  an USB2.0 host. It is designed to meet USB2.0 EHCI specification
+	  with minor modification.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called fotg210-hcd.
+
+config USB_FOTG210_UDC
+	depends on USB_GADGET
+	tristate "Faraday FOTG210 USB Peripheral Controller support"
+	help
+	   Faraday USB2.0 OTG controller which can be configured as
+	   high speed or full speed USB device. This driver suppports
+	   Bulk Transfer so far.
+
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "fotg210-udc".
+
+endif

drivers/usb/fotg210/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_USB_FOTG210_HCD)	+= fotg210-hcd.o
+obj-$(CONFIG_USB_FOTG210_UDC)	+= fotg210-udc.o

drivers/usb/fotg210/fotg210-hcd.c

@@ -77,7 +77,7 @@ MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
 
 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
 
-#include "fotg210.h"
+#include "fotg210-hcd.h"
 
 #define fotg210_dbg(fotg210, fmt, args...) \
 	dev_dbg(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)

drivers/usb/fotg210/fotg210-udc.c

@@ -16,7 +16,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 
-#include "fotg210.h"
+#include "fotg210-udc.h"
 
 #define	DRIVER_DESC	"FOTG210 USB Device Controller Driver"
 #define	DRIVER_VERSION	"30-April-2013"

drivers/usb/gadget/udc/Kconfig

@@ -108,17 +108,6 @@ config USB_FUSB300
 	help
 	   Faraday usb device controller FUSB300 driver
 
-config USB_FOTG210_UDC
-	depends on HAS_DMA
-	tristate "Faraday FOTG210 USB Peripheral Controller"
-	help
-	   Faraday USB2.0 OTG controller which can be configured as
-	   high speed or full speed USB device. This driver supppors
-	   Bulk Transfer so far.
-
-	   Say "y" to link the driver statically, or "m" to build a
-	   dynamically linked module called "fotg210_udc".
-
 config USB_GR_UDC
 	tristate "Aeroflex Gaisler GRUSBDC USB Peripheral Controller Driver"
 	depends on HAS_DMA

drivers/usb/gadget/udc/Makefile

@@ -34,7 +34,6 @@ obj-$(CONFIG_USB_EG20T)		+= pch_udc.o
 obj-$(CONFIG_USB_MV_UDC)	+= mv_udc.o
 mv_udc-y			:= mv_udc_core.o
 obj-$(CONFIG_USB_FUSB300)	+= fusb300_udc.o
-obj-$(CONFIG_USB_FOTG210_UDC)	+= fotg210-udc.o
 obj-$(CONFIG_USB_MV_U3D)	+= mv_u3d_core.o
 obj-$(CONFIG_USB_GR_UDC)	+= gr_udc.o
 obj-$(CONFIG_USB_GADGET_XILINX)	+= udc-xilinx.o

drivers/usb/host/Kconfig

@@ -389,17 +389,6 @@ config USB_ISP1362_HCD
 	  To compile this driver as a module, choose M here: the
 	  module will be called isp1362-hcd.
 
-config USB_FOTG210_HCD
-	tristate "FOTG210 HCD support"
-	depends on USB && HAS_DMA && HAS_IOMEM
-	help
-	  Faraday FOTG210 is an OTG controller which can be configured as
-	  an USB2.0 host. It is designed to meet USB2.0 EHCI specification
-	  with minor modification.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called fotg210-hcd.
-
 config USB_MAX3421_HCD
 	tristate "MAX3421 HCD (USB-over-SPI) support"
 	depends on USB && SPI

drivers/usb/host/Makefile

@@ -84,6 +84,5 @@ obj-$(CONFIG_USB_EHCI_FSL)	+= ehci-fsl.o
 obj-$(CONFIG_USB_EHCI_MV)	+= ehci-mv.o
 obj-$(CONFIG_USB_HCD_BCMA)	+= bcma-hcd.o
 obj-$(CONFIG_USB_HCD_SSB)	+= ssb-hcd.o
-obj-$(CONFIG_USB_FOTG210_HCD)	+= fotg210-hcd.o
 obj-$(CONFIG_USB_MAX3421_HCD)	+= max3421-hcd.o
 obj-$(CONFIG_USB_XEN_HCD)	+= xen-hcd.o