drivers: ethernet: phy: add Microchip's KSZ9131 PHY support

Add support for KSZ9131 (Gigabit Ethernet Transceiver with RGMII Support).
As first starter, 100MBit/s mode is tested.
https://www.microchip.com/en-us/product/ksz9131

Signed-off-by: Tony Han <tony.han@microchip.com>

Author: TonyHan11

drivers/ethernet/phy/CMakeLists.txt

@@ -6,6 +6,7 @@ zephyr_library_sources_ifdef(CONFIG_PHY_GENERIC_MII	phy_mii.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_ADIN2111	phy_adin2111.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_DM8806	phy_dm8806.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_KSZ8081	phy_microchip_ksz8081.c)
+zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_KSZ9131	phy_microchip_ksz9131.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_T1S phy_microchip_t1s.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_MICROCHIP_VSC8541 phy_microchip_vsc8541.c)
 zephyr_library_sources_ifdef(CONFIG_PHY_OA_TC14_PLCA_LIB phy_oa_tc14_plca.c)

drivers/ethernet/phy/Kconfig

@@ -51,6 +51,15 @@ config PHY_MICROCHIP_KSZ8081
 	help
 	  Enable Microchip KSZ8081 Ethernet PHY Driver
 
+config PHY_MICROCHIP_KSZ9131
+	bool "Microchip KSZ9131 PHY Driver"
+	default y
+	depends on DT_HAS_MICROCHIP_KSZ9131_ENABLED
+	depends on MDIO
+	depends on GPIO
+	help
+	  Enable Microchip KSZ9131 Ethernet PHY Driver
+
 config PHY_MICROCHIP_VSC8541
 	bool "Microchip VSC8541 PHY Driver"
 	default y