drivers: ethernet: Add ETH_DSA_SUPPORT

Make DSA dependent on ETH_DSA_SUPPORT which is selected by driver
kconfigs, rather than having a list of dependencies.

Signed-off-by: Declan Snyder <[email protected]>

Author: Declan Snyder

drivers/ethernet/Kconfig.dsa

@@ -4,9 +4,14 @@
 #               Lukasz Majewski <[email protected]>
 # SPDX-License-Identifier: Apache-2.0
 
+config ETH_DSA_SUPPORT
+	bool
+	help
+	  Set by an ethernet driver that supports DSA.
+
 menuconfig NET_DSA
 	bool "Distributed Switch Architecture support"
-	depends on ETH_MCUX || ETH_SAM_GMAC || ETH_STM32_HAL || ETH_NXP_ENET
+	depends on ETH_DSA_SUPPORT
 	help
 	  Enable Distributed Switch Architecture support. For now it
 	  only supports Kinetics and STM32 ENET drivers.

drivers/ethernet/Kconfig.sam_gmac

@@ -11,6 +11,7 @@ menuconfig ETH_SAM_GMAC
 		   DT_HAS_ATMEL_SAM0_GMAC_ENABLED
 	select NOCACHE_MEMORY if ARCH_HAS_NOCACHE_MEMORY_SUPPORT
 	select MDIO
+	select ETH_DSA_SUPPORT
 	help
 	  Enable Atmel SAM MCU Family Ethernet driver.
 

drivers/ethernet/Kconfig.stm32_hal

@@ -11,6 +11,7 @@ menuconfig ETH_STM32_HAL
 	select USE_STM32_HAL_ETH
 	select NOCACHE_MEMORY if SOC_SERIES_STM32H7X && CPU_CORTEX_M7
 	select HWINFO
+	select ETH_DSA_SUPPORT
 	imply CRC
 	help
 	  Enable STM32 HAL based Ethernet driver. It is available for

drivers/ethernet/nxp_enet/Kconfig

@@ -18,6 +18,7 @@ config ETH_NXP_ENET
 	select ARM_MPU if CPU_CORTEX_M7
 	select MDIO if DT_HAS_NXP_ENET_MDIO_ENABLED
 	select NET_POWER_MANAGEMENT if (PM_DEVICE && SOC_FAMILY_KINETIS)
+	select ETH_DSA_SUPPORT
 	help
 	  Enable NXP ENET Ethernet driver.
 
@@ -26,6 +27,7 @@ config ETH_MCUX
 	select NOCACHE_MEMORY if HAS_MCUX_CACHE && CPU_HAS_DCACHE
 	select ARM_MPU if CPU_CORTEX_M7
 	select NET_POWER_MANAGEMENT if PM_DEVICE
+	select ETH_DSA_SUPPORT
 	select DEPRECATED
 	help
 	  Enable deprecated legacy MCUX Ethernet driver.