ixp4xx: Break out mv88e6060 DSA switch to package

Just one of the devices uses the Marvell MV88E6060 DSA
switch so break this out from the generic kernel config
and into a package selected only by that single device
and probed at boot instead.

The big win is from being able to drop the dsa_core
(~600KB) kernel module out of the common kernel on
devices with no DSA switch.

Signed-off-by: Linus Walleij <[email protected]>
(cherry picked from commit 2456a2fd7f72d6afcee4ac9c2eccb312d0b1d36d)

package/kernel/linux/modules/netdevices.mk

@@ -575,6 +575,23 @@ endef
 
 $(eval $(call KernelPackage,dsa-b53-mdio))
 
+define KernelPackage/dsa-mv88e6060
+  SUBMENU:=$(NETWORK_DEVICES_MENU)
+  TITLE:=Marvell MV88E6060 DSA Switch
+  DEPENDS:=+kmod-dsa +kmod-phy-marvell
+  KCONFIG:=CONFIG_NET_DSA_TAG_TRAILER \
+  CONFIG_NET_DSA_MV88E6060
+  FILES:= \
+  $(LINUX_DIR)/drivers/net/dsa/mv88e6060.ko \
+  $(LINUX_DIR)/net/dsa/tag_trailer.ko
+  AUTOLOAD:=$(call AutoLoad,41,mv88e6060,1)
+endef
+
+define KernelPackage/dsa-mv88e6060/description
+  Kernel modules for MV88E6060 DSA switches
+endef
+
+$(eval $(call KernelPackage,dsa-mv88e6060))
 
 define KernelPackage/dsa-tag-dsa
   SUBMENU:=$(NETWORK_DEVICES_MENU)

target/linux/ixp4xx/config-6.6

@@ -168,9 +168,6 @@ CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_KUSER_HELPERS=y
 CONFIG_NEED_PER_CPU_KM=y
 CONFIG_NET_DEVLINK=y
-CONFIG_NET_DSA=y
-CONFIG_NET_DSA_MV88E6060=y
-CONFIG_NET_DSA_TAG_TRAILER=y
 CONFIG_NET_EGRESS=y
 CONFIG_NET_INGRESS=y
 CONFIG_NET_PTP_CLASSIFY=y

target/linux/ixp4xx/image/Makefile

@@ -128,7 +128,7 @@ define Device/usrobotics_usr8200
 	DEVICE_VENDOR := USRobotics
 	DEVICE_MODEL := USR8200
 	# USB2 is compiled in and needs no package
-	DEVICE_PACKAGES := ixp4xx-microcode-ethernet kmod-rtc-r7301 kmod-firewire kmod-firewire-ohci
+	DEVICE_PACKAGES := ixp4xx-microcode-ethernet kmod-rtc-r7301 kmod-firewire kmod-firewire-ohci kmod-dsa-mv88e6060
 	DEVICE_DTS := intel-ixp42x-usrobotics-usr8200
 	KERNEL := kernel-bin | append-dtb
 	IMAGES := kernel.bin rootfs.bin