phy: amlogic: add Amlogic G12A USB2 PHY Driver

This adds support for the USB2 PHY found in the Amlogic G12A SoC Family.

It supports Host and/or Peripheral mode, depending on it's position.
The first PHY is only used as Host, but the second supports Dual modes
defined by the USB Control Glue HW in front of the USB Controllers.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/amlogic/Kconfig

@@ -36,3 +36,14 @@ config PHY_MESON_GXL_USB3
 	  Enable this to support the Meson USB3 PHY and OTG detection
 	  IP block found in Meson GXL and GXM SoCs.
 	  If unsure, say N.
+
+config PHY_MESON_G12A_USB2
+	tristate "Meson G12A USB2 PHY driver"
+	default ARCH_MESON
+	depends on OF && (ARCH_MESON || COMPILE_TEST)
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	help
+	  Enable this to support the Meson USB2 PHYs found in Meson
+	  G12A SoCs.
+	  If unsure, say N.

drivers/phy/amlogic/Makefile

 obj-$(CONFIG_PHY_MESON8B_USB2)		+= phy-meson8b-usb2.o
 obj-$(CONFIG_PHY_MESON_GXL_USB2)	+= phy-meson-gxl-usb2.o
+obj-$(CONFIG_PHY_MESON_G12A_USB2)	+= phy-meson-g12a-usb2.o
 obj-$(CONFIG_PHY_MESON_GXL_USB3)	+= phy-meson-gxl-usb3.o