PHY: add APM X-Gene SoC 15Gbps Multi-purpose PHY driver

This patch adds support for the APM X-Gene SoC 15Gbps Multi-purpose PHY.
This is the physical layer interface for the corresponding host
controller. Currently, only external clock and Gen3 SATA mode
are supported.
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Tuan Phan <tphan@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/Kconfig

@@ -159,4 +159,11 @@ config PHY_EXYNOS5250_USB2
 	  particular SoC is compiled in the driver. In case of Exynos 5250 four
 	  phys are available - device, host, HSIC0 and HSIC.
 
+config PHY_XGENE
+	tristate "APM X-Gene 15Gbps PHY support"
+	depends on HAS_IOMEM && OF && (ARM64 || COMPILE_TEST)
+	select GENERIC_PHY
+	help
+	  This option enables support for APM X-Gene SoC multi-purpose PHY.
+
 endmenu

drivers/phy/Makefile

@@ -17,3 +17,4 @@ obj-$(CONFIG_PHY_SAMSUNG_USB2)		+= phy-samsung-usb2.o
 obj-$(CONFIG_PHY_EXYNOS4210_USB2)	+= phy-exynos4210-usb2.o
 obj-$(CONFIG_PHY_EXYNOS4X12_USB2)	+= phy-exynos4x12-usb2.o
 obj-$(CONFIG_PHY_EXYNOS5250_USB2)	+= phy-exynos5250-usb2.o
+obj-$(CONFIG_PHY_XGENE)			+= phy-xgene.o