driver: eth: Support for lan8651 T1S ETH

This patch set provides support for T1S ethernet device - LAN8651.

For SPI communication the implementation of Open Alliance TC6
specification is used.

The driver implementation focuses mostly on reducing memory footprint,
as the used SoC (STM32G491) for development has only 32 KiB RAM in total.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

CODEOWNERS

@@ -304,6 +304,7 @@
 /drivers/ethernet/*smsc91x*               @sgrrzhf
 /drivers/ethernet/*adin2111*              @GeorgeCGV
 /drivers/ethernet/*oa_tc6*                @lmajewski
+/drivers/ethernet/*lan865x*               @lmajewski
 /drivers/ethernet/phy/                    @rlubos @tbursztyka @arvinf @jukkar
 /drivers/ethernet/phy/*adin2111*          @GeorgeCGV
 /drivers/mdio/                            @rlubos @tbursztyka @arvinf

drivers/ethernet/CMakeLists.txt

@@ -34,6 +34,7 @@ zephyr_library_sources_ifdef(CONFIG_SLIP_TAP		eth_slip_tap.c)
 zephyr_library_sources_ifdef(CONFIG_ETH_SMSC91X		eth_smsc91x.c)
 zephyr_library_sources_ifdef(CONFIG_ETH_IVSHMEM 	eth_ivshmem.c eth_ivshmem_queue.c)
 zephyr_library_sources_ifdef(CONFIG_ETH_ADIN2111	eth_adin2111.c)
+zephyr_library_sources_ifdef(CONFIG_ETH_LAN865X	        eth_lan865x.c oa_tc6.c)
 
 if(CONFIG_ETH_NXP_S32_NETC)
   zephyr_library_sources(eth_nxp_s32_netc.c)

drivers/ethernet/Kconfig

@@ -62,6 +62,7 @@ source "drivers/ethernet/Kconfig.smsc91x"
 source "drivers/ethernet/Kconfig.ivshmem"
 source "drivers/ethernet/Kconfig.adin2111"
 source "drivers/ethernet/Kconfig.numaker"
+source "drivers/ethernet/Kconfig.lan865x"
 
 source "drivers/ethernet/phy/Kconfig"
 

drivers/ethernet/Kconfig.lan865x

@@ -0,0 +1,50 @@
+# Copyright (c) 2023 DENX Software Engineering GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig ETH_LAN865X
+	bool "LAN865X 10BASE-T1S Controller"
+	default y
+	depends on DT_HAS_MICROCHIP_LAN865X_ENABLED
+	select SPI
+	help
+	  The LAN865X is a low power, 10BASE-T1S transceiver compliant with
+	  the IEEE® 802.3cg-2019™ Ethernet standard for long reach, 10
+	  Mbps single pair Ethernet (SPE).
+
+	  Featuring an integrated media access control (MAC) and a PHY,
+	  the LAN865X enables direct connectivity with a variety of controllers
+	  via a serial peripheral inter-face (SPI).
+
+if ETH_LAN865X
+
+config ETH_LAN865X_INIT_PRIORITY
+	int "LAN865X driver init priority"
+	default 72
+	help
+	  LAN865X device driver initialization priority.
+	  Must be initialized after SPI.
+
+
+config ETH_LAN865X_IRQ_THREAD_STACK_SIZE
+	int "Stack size for a thread that processes IRQ"
+	default 512
+	help
+	  Size of the stack used for internal thread which is ran to
+	  process raised INT IRQ.
+
+config ETH_LAN865X_IRQ_THREAD_PRIO
+	int "Priority for internal incoming packet handler"
+	default 2
+	help
+	  Priority level for internal thread which is ran for LAN
+	  INT IRQ processing.
+
+config ETH_LAN865X_TIMEOUT
+	int "IP buffer timeout"
+	default 100
+	help
+	  Given timeout in milliseconds. Maximum amount of time
+	  that the driver will wait from the IP stack to get
+	  a memory buffer before the Ethernet frame is dropped.
+
+endif # ETH_LAN865X