net: pcs: add driver for MediaTek USXGMII PCS

Add driver for USXGMII PCS found in the MediaTek MT7988 SoC and supporting
USXGMII, 10GBase-R and 5GBase-R interface modes.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

Author: dangowrt

MAINTAINERS

@@ -15275,7 +15275,9 @@ M:	Daniel Golle <daniel@makrotopia.org>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	drivers/net/pcs/pcs-mtk-lynxi.c
+F:	drivers/net/pcs/pcs-mtk-usxgmii.c
 F:	include/linux/pcs/pcs-mtk-lynxi.h
+F:	include/linux/pcs/pcs-mtk-usxgmii.h
 
 MEDIATEK ETHERNET PHY DRIVERS
 M:	Daniel Golle <daniel@makrotopia.org>

drivers/net/pcs/Kconfig

@@ -39,6 +39,18 @@ config PCS_MTK_LYNXI
 	  This module provides helpers to phylink for managing the LynxI PCS
 	  which is part of MediaTek's SoC and Ethernet switch ICs.
 
+config PCS_MTK_USXGMII
+	tristate "MediaTek USXGMII PCS"
+	select FWNODE_PCS
+	select PCS_MTK_LYNXI
+	select PHYLINK
+	imply PHY_MTK_PEXTP
+	help
+	  This module provides a driver for MediaTek's USXGMII PCS supporting
+	  10GBase-R, 5GBase-R and USXGMII interface modes.
+	  1000Base-X, 2500Base-X and Cisco SGMII are supported on the same
+	  differential pairs via an embedded LynxI PCS.
+
 config PCS_RZN1_MIIC
 	tristate "Renesas RZ/N1 MII converter"
 	depends on OF && (ARCH_RZN1 || COMPILE_TEST)

drivers/net/pcs/Kconfig.orig

@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PCS Layer Configuration
+#
+
+menu "PCS device drivers"
+
+config OF_PCS
+	tristate
+	depends on OF
+	depends on PHYLINK
+	help
+		OpenFirmware PCS accessors
+
+config PCS_XPCS
+	tristate "Synopsys DesignWare Ethernet XPCS"
+	select PHYLINK
+	help
+	  This module provides a driver and helper functions for Synopsys
+	  DesignWare XPCS controllers.
+
+config PCS_LYNX
+	tristate
+	help
+	  This module provides helpers to phylink for managing the Lynx PCS
+	  which is part of the Layerscape and QorIQ Ethernet SERDES.
+
+config PCS_MTK_LYNXI
+	tristate
+	select REGMAP
+	help
+	  This module provides helpers to phylink for managing the LynxI PCS
+	  which is part of MediaTek's SoC and Ethernet switch ICs.
+
+config PCS_MTK_USXGMII
+	tristate "MediaTek USXGMII PCS"
+	select OF_PCS
+	select PCS_MTK_LYNXI
+	select PHY_MTK_PEXTP
+	select PHYLINK
+	help
+	  This module provides a driver for MediaTek's USXGMII PCS supporting
+	  10GBase-R, 5GBase-R and USXGMII interface modes.
+	  1000Base-X, 2500Base-X and Cisco SGMII are supported on the same
+	  differential pairs via an embedded LynxI PHY.
+
+config PCS_RZN1_MIIC
+	tristate "Renesas RZ/N1 MII converter"
+	depends on OF && (ARCH_RZN1 || COMPILE_TEST)
+	help
+	  This module provides a driver for the MII converter that is available
+	  on RZ/N1 SoCs. This PCS converts MII to RMII/RGMII or can be set in
+	  pass-through mode for MII.
+
+endmenu

drivers/net/pcs/Makefile

@@ -9,4 +9,5 @@ pcs_xpcs-$(CONFIG_PCS_XPCS)	:= pcs-xpcs.o pcs-xpcs-plat.o \
 obj-$(CONFIG_PCS_XPCS)		+= pcs_xpcs.o
 obj-$(CONFIG_PCS_LYNX)		+= pcs-lynx.o
 obj-$(CONFIG_PCS_MTK_LYNXI)	+= pcs-mtk-lynxi.o
+obj-$(CONFIG_PCS_MTK_USXGMII)	+= pcs-mtk-usxgmii.o
 obj-$(CONFIG_PCS_RZN1_MIIC)	+= pcs-rzn1-miic.o