net: ethernet: ti: Introduce am654 gigabit eth switch subsystem driver

Add new driver for the TI AM65x SoC Gigabit Ethernet Switch subsystem (CPSW
NUSS). It has two ports and provides Ethernet packet communication for the
device and can be configured as an Ethernet switch. CPSW NUSS features: the
Reduced Gigabit Media Independent Interface (RGMII), Reduced Media
Independent Interface (RMII), and the Management Data Input/Output (MDIO)
interface for physical layer device (PHY) management. The TI AM65x SoC has
integrated two-port Gigabit Ethernet Switch subsystem into device MCU
domain named MCU_CPSW0. One Ethernet port (port 1) with selectable RGMII
and RMII interfaces and an internal Communications Port Programming
Interface (CPPI) port (Host port 0).

Host Port 0 CPPI Packet Streaming Interface interface supports 8 TX
channels and on RX channels operating by TI am654 NAVSS Unified DMA
Peripheral Root Complex (UDMA-P) controller.
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NKeerthy <j-keerthy@ti.com>
Acked-by: NJoe Hershberger <joe.hershberger@ni.com>

drivers/net/ti/Kconfig

@@ -18,3 +18,11 @@ config DRIVER_TI_KEYSTONE_NET
 	bool "TI Keystone 2 Ethernet"
 	help
 	   This driver supports the TI Keystone 2 Ethernet subsystem
+
+config TI_AM65_CPSW_NUSS
+	bool "TI K3 AM65x MCU CPSW Nuss Ethernet controller driver"
+	depends on ARCH_K3
+	select PHYLIB
+	help
+	  This driver supports TI K3 MCU CPSW Nuss Ethernet controller
+	  in Texas Instruments K3 AM65x SoCs.

drivers/net/ti/Makefile

@@ -5,3 +5,4 @@
 obj-$(CONFIG_DRIVER_TI_CPSW) += cpsw.o cpsw-common.o cpsw_mdio.o
 obj-$(CONFIG_DRIVER_TI_EMAC) += davinci_emac.o
 obj-$(CONFIG_DRIVER_TI_KEYSTONE_NET) += keystone_net.o cpsw_mdio.o
+obj-$(CONFIG_TI_AM65_CPSW_NUSS) += am65-cpsw-nuss.o cpsw_mdio.o