microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY

The LAN8650/1 is designed to conform to the OPEN Alliance 10BASE-T1x
MAC-PHY Serial Interface specification, Version 1.1. The IEEE Clause 4
MAC integration provides the low pin count standard SPI interface to any
microcontroller therefore providing Ethernet functionality without
requiring MAC integration within the microcontroller. The LAN8650/1
operates as an SPI client supporting SCLK clock rates up to a maximum of
25 MHz. This SPI interface supports the transfer of both data (Ethernet
frames) and control (register access).

By default, the chunk data payload is 64 bytes in size. The Ethernet
Media Access Controller (MAC) module implements a 10 Mbps half duplex
Ethernet MAC, compatible with the IEEE 802.3 standard. 10BASE-T1S
physical layer transceiver integrated is into the LAN8650/1. The PHY and
MAC are connected via an internal Media Independent Interface (MII).
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@microchip.com>
Link: https://patch.msgid.link/20240909082514.262942-14-Parthiban.Veerasooran@microchip.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -14980,6 +14980,12 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 F:	drivers/net/ethernet/microchip/lan743x_*
 
+MICROCHIP LAN8650/1 10BASE-T1S MACPHY ETHERNET DRIVER
+M:	Parthiban Veerasooran <parthiban.veerasooran@microchip.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	drivers/net/ethernet/microchip/lan865x/lan865x.c
+
 MICROCHIP LAN87xx/LAN937x T1 PHY DRIVER
 M:	Arun Ramadoss <arun.ramadoss@microchip.com>
 R:	UNGLinuxDriver@microchip.com

drivers/net/ethernet/microchip/Kconfig

@@ -57,6 +57,7 @@ config LAN743X
 	  To compile this driver as a module, choose M here. The module will be
 	  called lan743x.
 
+source "drivers/net/ethernet/microchip/lan865x/Kconfig"
 source "drivers/net/ethernet/microchip/lan966x/Kconfig"
 source "drivers/net/ethernet/microchip/sparx5/Kconfig"
 source "drivers/net/ethernet/microchip/vcap/Kconfig"

drivers/net/ethernet/microchip/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_LAN743X) += lan743x.o
 
 lan743x-objs := lan743x_main.o lan743x_ethtool.o lan743x_ptp.o
 
+obj-$(CONFIG_LAN865X) += lan865x/
 obj-$(CONFIG_LAN966X_SWITCH) += lan966x/
 obj-$(CONFIG_SPARX5_SWITCH) += sparx5/
 obj-$(CONFIG_VCAP) += vcap/

drivers/net/ethernet/microchip/lan865x/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Microchip LAN865x Driver Support
+#
+
+if NET_VENDOR_MICROCHIP
+
+config LAN865X
+	tristate "LAN865x support"
+	depends on SPI
+	select OA_TC6
+	help
+	  Support for the Microchip LAN8650/1 Rev.B0/B1 MACPHY Ethernet chip. It
+	  uses OPEN Alliance 10BASE-T1x Serial Interface specification.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called lan865x.
+
+endif # NET_VENDOR_MICROCHIP

drivers/net/ethernet/microchip/lan865x/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Microchip LAN865x Driver
+#
+
+obj-$(CONFIG_LAN865X) += lan865x.o