[drivers][ethernet] Add Realtek RTL8125 PCI Ethernet driver

components/drivers/ethernet/Kconfig

@@ -8,6 +8,7 @@ menuconfig RT_USING_ETHERNET
 
 if RT_USING_ETHERNET
     rsource "cadence/Kconfig"
+    rsource "realtek/Kconfig"
     rsource "synopsys/Kconfig"
     osource "$(SOC_DM_ETHERNET_DIR)/Kconfig"
 endif

components/drivers/ethernet/realtek/Kconfig

@@ -0,0 +1,22 @@
+config RT_ETHERNET_REALTEK
+    bool "Realtek RTL8125 Ethernet"
+    depends on RT_USING_PCI
+    depends on !RT_LWIP_USING_HW_CHECKSUM
+    default n
+    help
+        Enable the RT-Thread native PCI driver for Realtek RTL8125/RTL8162
+        Ethernet controllers. The driver implements one TX/RX queue, interrupt
+        driven receive, descriptor-ring DMA, link change reporting, and
+        10/100/1000/2500M auto-negotiation.
+        Requires lwIP software checksums; disable the global hardware checksum
+        option before enabling this driver.
+
+config RT_REALTEK_PTP
+    bool "PTP supported"
+    depends on RT_ETHERNET_REALTEK
+    depends on RT_USING_PTP
+    default n
+    help
+        Register the RTL8125 hardware PTP clock with the RT-Thread PTP
+        framework. Supported operations include gettime, settime, adjtime,
+        adjfreq, and PPS where the selected hardware PTP block supports it.

components/drivers/ethernet/realtek/SConscript

@@ -0,0 +1,18 @@
+from building import *
+
+group = []
+
+if not GetDepend(['RT_ETHERNET_REALTEK']):
+    Return('group')
+
+cwd = GetCurrentDir()
+CPPPATH = [cwd + '/../../include', cwd + '/../']
+
+src = ['r8125.c']
+
+if GetDepend(['RT_REALTEK_PTP']):
+    src += ['r8125_ptp.c']
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')