net: phy: add driver for MediaTek SoC built-in GE PHYs

Some of MediaTek's Filogic SoCs come with built-in gigabit Ethernet
PHYs which require calibration data from the SoC's efuse.
Despite the similar design the driver doesn't share any code with the
existing mediatek-ge.c.
Add support for such PHYs by introducing a new driver with basic
support for MediaTek SoCs MT7981 and MT7988 built-in 1GE PHYs.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -13151,6 +13151,15 @@ S:	Maintained
 F:	drivers/net/pcs/pcs-mtk-lynxi.c
 F:	include/linux/pcs/pcs-mtk-lynxi.h
 
+MEDIATEK ETHERNET PHY DRIVERS
+M:	Daniel Golle <daniel@makrotopia.org>
+M:	Qingfang Deng <dqfext@gmail.com>
+M:	SkyLake Huang <SkyLake.Huang@mediatek.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/phy/mediatek-ge-soc.c
+F:	drivers/net/phy/mediatek-ge.c
+
 MEDIATEK I2C CONTROLLER DRIVER
 M:	Qii Wang <qii.wang@mediatek.com>
 L:	linux-i2c@vger.kernel.org

drivers/net/phy/Kconfig

@@ -236,6 +236,18 @@ config MEDIATEK_GE_PHY
 	help
 	  Supports the MediaTek Gigabit Ethernet PHYs.
 
+config MEDIATEK_GE_SOC_PHY
+	tristate "MediaTek SoC Ethernet PHYs"
+	depends on (ARM64 && ARCH_MEDIATEK) || COMPILE_TEST
+	select NVMEM_MTK_EFUSE
+	help
+	  Supports MediaTek SoC built-in Gigabit Ethernet PHYs.
+
+	  Include support for built-in Ethernet PHYs which are present in
+	  the MT7981 and MT7988 SoCs. These PHYs need calibration data
+	  present in the SoCs efuse and will dynamically calibrate VCM
+	  (common-mode voltage) during startup.
+
 config MICREL_PHY
 	tristate "Micrel PHYs"
 	depends on PTP_1588_CLOCK_OPTIONAL

drivers/net/phy/Makefile

@@ -69,6 +69,7 @@ obj-$(CONFIG_MARVELL_PHY)	+= marvell.o
 obj-$(CONFIG_MARVELL_88X2222_PHY)	+= marvell-88x2222.o
 obj-$(CONFIG_MAXLINEAR_GPHY)	+= mxl-gpy.o
 obj-$(CONFIG_MEDIATEK_GE_PHY)	+= mediatek-ge.o
+obj-$(CONFIG_MEDIATEK_GE_SOC_PHY)	+= mediatek-ge-soc.o
 obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
 obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o