phy: rockchip: add usbdp combo phy driver

This adds a new USBDP combo PHY with Samsung IP block driver.
The PHY is a combo between USB 3.0 and DisplayPort alt mode.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
[eugen.hristev@collabora.com: ported to 2023.07, clean-up]
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
index f87ca8c..0247d93 100644
--- a/drivers/phy/rockchip/Kconfig
+++ b/drivers/phy/rockchip/Kconfig
@@ -41,6 +41,13 @@
 	  It could support PCIe Gen3 single root complex, and could
 	  also be able splited into multiple combinations of lanes.
 
+config PHY_ROCKCHIP_USBDP
+	tristate "Rockchip USBDP COMBO PHY Driver"
+	depends on ARCH_ROCKCHIP
+	select PHY
+	help
+	  Enable this to support the Rockchip USB3.0/DP
+	  combo PHY with Samsung IP block.
 
 config PHY_ROCKCHIP_TYPEC
 	bool "Rockchip TYPEC PHY Driver"