usb: phy: samsung: Add host phy support to samsung-phy driver

This patch adds host phy support to samsung-usbphy driver and
further adds support for samsung's exynos5250 usb-phy.

Signed-off-by: Praveen Paneri <p.paneri@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/samsung-usbphy.txt

@@ -1,15 +1,23 @@
 * Samsung's usb phy transceiver
 
-The Samsung's phy transceiver is used for controlling usb otg phy for
-s3c-hsotg usb device controller.
+The Samsung's phy transceiver is used for controlling usb phy for
+s3c-hsotg as well as ehci-s5p and ohci-exynos usb controllers
+across Samsung SOCs.
 TODO: Adding the PHY binding with controller(s) according to the under
 developement generic PHY driver.
 
 Required properties:
+
+Exynos4210:
 - compatible : should be "samsung,exynos4210-usbphy"
 - reg : base physical address of the phy registers and length of memory mapped
 	region.
 
+Exynos5250:
+- compatible : should be "samsung,exynos5250-usbphy"
+- reg : base physical address of the phy registers and length of memory mapped
+	region.
+
 Optional properties:
 - #address-cells: should be '1' when usbphy node has a child node with 'reg'
 		  property.

drivers/usb/phy/Kconfig

@@ -48,7 +48,7 @@ config USB_RCAR_PHY
 
 config SAMSUNG_USBPHY
 	bool "Samsung USB PHY controller Driver"
-	depends on USB_S3C_HSOTG
+	depends on USB_S3C_HSOTG || USB_EHCI_S5P || USB_OHCI_EXYNOS
 	select USB_OTG_UTILS
 	help
 	  Enable this to support Samsung USB phy controller for samsung