kernel: add Microchip ENC28J60 SPI Ethernet controller module

The ENC28J60 is a 10 Mbps half-duplex Ethernet controller interfaced via SPI.
It achieves real-world bandwidth up to 5Mbit/s on devices like the RPi Zero due
to SPI limits.
Commonly used with Raspberry Pi Zero boards for wired network connectivity.

Signed-off-by: Albrecht Lohofener <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19048
Signed-off-by: Álvaro Fernández Rojas <[email protected]>
(cherry picked from commit 4987239913794811b8ac71ff141129e276565d6b)

package/kernel/linux/modules/netdevices.mk

@@ -2026,3 +2026,19 @@ define KernelPackage/amazon-ena/description
 endef
 
 $(eval $(call KernelPackage,amazon-ena))
+
+define KernelPackage/enc28j60
+  SUBMENU:=$(NETWORK_DEVICES_MENU)
+  TITLE:=Microchip ENC28J60 SPI Ethernet driver
+  KCONFIG:=\
+    CONFIG_ENC28J60 \
+    CONFIG_ENC28J60_WRITEVERIFY=n
+  FILES:=$(LINUX_DIR)/drivers/net/ethernet/microchip/enc28j60.ko
+  AUTOLOAD:=$(call AutoProbe,enc28j60)
+endef
+
+define KernelPackage/enc28j60/description
+  Kernel module for Microchip ENC28J60 SPI Ethernet controller
+endef
+
+$(eval $(call KernelPackage,enc28j60))