usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller

R-Car H3 has USB3.0 peripheral controllers. This controller's has the
following features:
 - Supports super, high and full speed
 - Contains 30 pipes for bulk or interrupt transfer
 - Contains dedicated DMA controller

This driver doesn't support the dedicated DMAC for now.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/renesas_usb3.txt

+Renesas Electronics USB3.0 Peripheral driver
+
+Required properties:
+  - compatible: Must contain one of the following:
+	- "renesas,r8a7795-usb3-peri"
+  - reg: Base address and length of the register for the USB3.0 Peripheral
+  - interrupts: Interrupt specifier for the USB3.0 Peripheral
+  - clocks: clock phandle and specifier pair
+
+Example:
+	usb3_peri0: usb@ee020000 {
+		compatible = "renesas,r8a7795-usb3-peri";
+		reg = <0 0xee020000 0 0x400>;
+		interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpg CPG_MOD 328>;
+	};
+
+	usb3_peri1: usb@ee060000 {
+		compatible = "renesas,r8a7795-usb3-peri";
+		reg = <0 0xee060000 0 0x400>;
+		interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpg CPG_MOD 327>;
+	};

drivers/usb/gadget/udc/Kconfig

@@ -174,6 +174,17 @@ config USB_RENESAS_USBHS_UDC
 	   dynamically linked module called "renesas_usbhs" and force all
 	   gadget drivers to also be dynamically linked.
 
+config USB_RENESAS_USB3
+	tristate 'Renesas USB3.0 Peripheral controller'
+	depends on ARCH_SHMOBILE || COMPILE_TEST
+	help
+	   Renesas USB3.0 Peripheral controller is a USB peripheral controller
+	   that supports super, high, and full speed USB 3.0 data transfers.
+
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "renesas_usb3" and force all
+	   gadget drivers to also be dynamically linked.
+
 config USB_PXA27X
 	tristate "PXA 27x"
 	help

drivers/usb/gadget/udc/Makefile

@@ -19,6 +19,7 @@ fsl_usb2_udc-y			:= fsl_udc_core.o
 fsl_usb2_udc-$(CONFIG_ARCH_MXC)	+= fsl_mxc_udc.o
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
 obj-$(CONFIG_USB_R8A66597)	+= r8a66597-udc.o
+obj-$(CONFIG_USB_RENESAS_USB3)	+= renesas_usb3.o
 obj-$(CONFIG_USB_FSL_QE)	+= fsl_qe_udc.o
 obj-$(CONFIG_USB_S3C_HSUDC)	+= s3c-hsudc.o
 obj-$(CONFIG_USB_LPC32XX)	+= lpc32xx_udc.o