phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver

Add driver for the HDMI/eDP TX Combo PHY found on Rockchip RK3588 SoC.

The PHY is based on a Samsung IP block and supports HDMI 2.1 TMDS, FRL
and eDP links.  The maximum data rate is 12Gbps (FRL), while the minimum
is 250Mbps (TMDS).

Only the TMDS link is currently supported.
Co-developed-by: Algea Cao <algea.cao@rock-chips.com>
Signed-off-by: Algea Cao <algea.cao@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://lore.kernel.org/r/20240214-phy-hdptx-v4-2-e7974f46c1a7@collabora.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/rockchip/Kconfig

@@ -83,6 +83,14 @@ config PHY_ROCKCHIP_PCIE
 	help
 	  Enable this to support the Rockchip PCIe PHY.
 
+config PHY_ROCKCHIP_SAMSUNG_HDPTX
+	tristate "Rockchip Samsung HDMI/eDP Combo PHY driver"
+	depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
+	select GENERIC_PHY
+	help
+	  Enable this to support the Rockchip HDMI/eDP Combo PHY
+	  with Samsung IP block.
+
 config PHY_ROCKCHIP_SNPS_PCIE3
 	tristate "Rockchip Snps PCIe3 PHY Driver"
 	depends on (ARCH_ROCKCHIP && OF) || COMPILE_TEST

drivers/phy/rockchip/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_PHY_ROCKCHIP_INNO_HDMI)	+= phy-rockchip-inno-hdmi.o
 obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
 obj-$(CONFIG_PHY_ROCKCHIP_NANENG_COMBO_PHY)	+= phy-rockchip-naneng-combphy.o
 obj-$(CONFIG_PHY_ROCKCHIP_PCIE)		+= phy-rockchip-pcie.o
+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