phy: amlogic: Add Amlogic G12A USB3 + PCIE Combo PHY Driver

This adds support for the shared USB3 + PCIE PHY found in the
Amlogic G12A SoC Family.

It supports USB3 Host mode or PCIE 2.0 mode, depending on the layout of
the board.

Selection is done by the #phy-cells, making the mode static and exclusive.
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

@@ -47,3 +47,14 @@ config PHY_MESON_G12A_USB2
 	  Enable this to support the Meson USB2 PHYs found in Meson
 	  G12A SoCs.
 	  If unsure, say N.
+
+config PHY_MESON_G12A_USB3_PCIE
+	tristate "Meson G12A USB3+PCIE Combo 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 USB3 + PCIE Combo PHY found
+	  in Meson G12A SoCs.
+	  If unsure, say N.

drivers/phy/amlogic/Makefile

@@ -2,3 +2,4 @@ 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
+obj-$(CONFIG_PHY_MESON_G12A_USB3_PCIE)	+= phy-meson-g12a-usb3-pcie.o