phy: rockchip: add usbdp combo phy driver

This adds a new USBDP combo PHY with Samsung IP block driver.

The driver get lane mux and mapping info in 2 ways, supporting
DisplayPort alternate mode or parsing from DT. When parsing from DT,
the property "rockchip,dp-lane-mux" provide the DP mux and mapping
info. This is needed when the PHY is not used with TypeC Alt-Mode.
For example if the USB3 interface of the PHY is connected to a USB
Type A connector and the DP interface is connected to a DisplayPort
connector.

When do DP link training, need to set lane number, link rate, swing,
and pre-emphasis via PHY configure interface.

Co-developed-by: Heiko Stuebner <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Co-developed-by: Zhang Yubing <[email protected]>
Signed-off-by: Zhang Yubing <[email protected]>
Co-developed-by: Frank Wang <[email protected]>
Signed-off-by: Frank Wang <[email protected]>
Signed-off-by: Sebastian Reichel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: sre

drivers/phy/rockchip/Kconfig

@@ -115,3 +115,15 @@ config PHY_ROCKCHIP_USB
 	select GENERIC_PHY
 	help
 	  Enable this to support the Rockchip USB 2.0 PHY.
+
+config PHY_ROCKCHIP_USBDP
+	tristate "Rockchip USBDP COMBO PHY Driver"
+	depends on ARCH_ROCKCHIP && OF
+	select GENERIC_PHY
+	select TYPEC
+	help
+	  Enable this to support the Rockchip USB3.0/DP combo PHY with
+	  Samsung IP block. This is required for USB3 support on RK3588.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called phy-rockchip-usbdp

drivers/phy/rockchip/Makefile

@@ -12,3 +12,4 @@ obj-$(CONFIG_PHY_ROCKCHIP_SAMSUNG_HDPTX)	+= phy-rockchip-samsung-hdptx.o
 obj-$(CONFIG_PHY_ROCKCHIP_SNPS_PCIE3)	+= phy-rockchip-snps-pcie3.o
 obj-$(CONFIG_PHY_ROCKCHIP_TYPEC)	+= phy-rockchip-typec.o
 obj-$(CONFIG_PHY_ROCKCHIP_USB)		+= phy-rockchip-usb.o
+obj-$(CONFIG_PHY_ROCKCHIP_USBDP)	+= phy-rockchip-usbdp.o