drivers: ethernet: lan865x: fix module init priority

Align the LAN865x driver module initialization priority with the default
priorities of MDIO and PHY drivers. The microchip_t1s PHY driver supports
both LAN865x internal PHY and LAN867x external PHY. It was observed that
the microchip_t1s driver initialization priority did not match the
priority sequence used by the GMAC driver when the evb-lan8670-rmii (an
external LAN8670 PHY) was connected to the SAME54 Curiosity Ultra
platform, leading to potential initialization order issues. This change
ensures the correct initialization sequence for reliable operation.

The initialization priorities of the microchip_t1s and mdio_lan865x
drivers are now set to the default values used in Zephyr. The LAN865x
driver init priority is updated to the most appropriate value so that the
microchip_t1s init priority aligns with all MAC drivers, maintaining the
correct initialization sequence.

Since the microchip_t1s driver can be used by many MAC drivers, keeping
the default priority provided by Zephyr is a good approach. Instead,
setting a specific priority for the eth_lan865x driver is more appropriate
to ensure proper initialization order.

Signed-off-by: Parthiban Veerasooran <[email protected]>

Author: ParthibanI17164

drivers/ethernet/Kconfig.lan865x

@@ -21,7 +21,7 @@ if ETH_LAN865X
 
 config ETH_LAN865X_INIT_PRIORITY
 	int "LAN865X driver init priority"
-	default 72
+	default 50
 	help
 	  LAN865X device driver initialization priority.
 	  Must be initialized after SPI.

drivers/ethernet/eth_lan865x.c

@@ -478,7 +478,7 @@ static const struct ethernet_api lan865x_api_func = {
 		.tc6 = &oa_tc6_##inst};                                                            \
                                                                                                    \
 	ETH_NET_DEVICE_DT_INST_DEFINE(inst, lan865x_init, NULL, &lan865x_data_##inst,              \
-				      &lan865x_config_##inst, CONFIG_ETH_INIT_PRIORITY,            \
+				      &lan865x_config_##inst, CONFIG_ETH_LAN865X_INIT_PRIORITY,    \
 				      &lan865x_api_func, NET_ETH_MTU);
 
 DT_INST_FOREACH_STATUS_OKAY(LAN865X_DEFINE);

drivers/ethernet/phy/Kconfig.microchip_t1s

@@ -1,7 +1,7 @@
 # Copyright 2025 Microchip Technology Inc.
 # SPDX-License-Identifier: Apache-2.0
 
-menuconfig PHY_MICROCHIP_T1S
+config PHY_MICROCHIP_T1S
 	bool "Microchip 10BASE-T1S Ethernet PHYs Driver"
 	default y
 	depends on DT_HAS_MICROCHIP_T1S_PHY_ENABLED
@@ -10,13 +10,3 @@ menuconfig PHY_MICROCHIP_T1S
 	help
 	  Enable Microchip's LAN8650/1 Rev.B0/B1 Internal PHYs and
 	  LAN8670/1/2 Rev.C1/C2 PHYs Driver.
-
-if PHY_MICROCHIP_T1S
-
-config PHY_MICROCHIP_T1S_INIT_PRIORITY
-	int "Microchip T1S PHY init priority"
-	default 82
-	help
-	  Microchip T1S phy device driver initialization priority.
-
-endif

drivers/ethernet/phy/phy_microchip_t1s.c

@@ -551,6 +551,6 @@ static DEVICE_API(ethphy, mc_t1s_phy_api) = {
 	static struct mc_t1s_data mc_t1s_##n##_data;                                               \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(n, &phy_mc_t1s_init, NULL, &mc_t1s_##n##_data, &mc_t1s_##n##_config, \
-			      POST_KERNEL, CONFIG_PHY_MICROCHIP_T1S_INIT_PRIORITY, &mc_t1s_phy_api);
+			      POST_KERNEL, CONFIG_PHY_INIT_PRIORITY, &mc_t1s_phy_api);
 
 DT_INST_FOREACH_STATUS_OKAY(MICROCHIP_T1S_PHY_INIT);

drivers/mdio/Kconfig.lan865x

@@ -1,20 +1,10 @@
 # Copyright 2024 Microchip Technology Inc
 # SPDX-License-Identifier: Apache-2.0
 
-menuconfig MDIO_LAN865X
+config MDIO_LAN865X
 	bool "LAN865X MDIO driver"
 	default y
 	depends on DT_HAS_MICROCHIP_LAN865X_MDIO_ENABLED
 	depends on ETH_LAN865X
 	help
 	  Enable LAN865X MDIO driver.
-
-if MDIO_LAN865X
-
-config MDIO_LAN865X_INIT_PRIORITY
-	int "LAN865X MDIO init priority"
-	default 81
-	help
-	  LAN865X MDIO device driver initialization priority.
-
-endif

drivers/mdio/mdio_lan865x.c

@@ -64,6 +64,6 @@ static DEVICE_API(mdio, mdio_lan865x_api) = {
 		.dev = DEVICE_DT_GET(DT_INST_PARENT(n)),                                           \
 	};                                                                                         \
 	DEVICE_DT_INST_DEFINE(n, NULL, NULL, NULL, &mdio_lan865x_config_##n, POST_KERNEL,          \
-			      CONFIG_MDIO_LAN865X_INIT_PRIORITY, &mdio_lan865x_api);
+			      CONFIG_MDIO_INIT_PRIORITY, &mdio_lan865x_api);
 
 DT_INST_FOREACH_STATUS_OKAY(MICROCHIP_LAN865X_MDIO_INIT)