realtek: Add RTL931X sub-target

We add the RTL931X sub-target with kernel configuration for
a dual core MIPS InterAptive CPU.

Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Birger Koblitz <git@birger-koblitz.de>

7 files changed, 517 insertions, 1 deletions

diff --git a/target/linux/realtek/Makefile b/target/linux/realtek/Makefile
index 26b7d0afaa..704242a000 100644
--- a/target/linux/realtek/Makefile
+++ b/target/linux/realtek/Makefile
@@ -7,7 +7,7 @@ BOARD:=realtek
 BOARDNAME:=Realtek MIPS
 DEVICE_TYPE:=basic
 FEATURES:=ramdisk squashfs
-SUBTARGETS:=rtl838x rtl839x rtl930x
+SUBTARGETS:=rtl838x rtl839x rtl930x rtl931x
 
 KERNEL_PATCHVER:=5.10
 
diff --git a/target/linux/realtek/dts-5.10/rtl931x.dtsi b/target/linux/realtek/dts-5.10/rtl931x.dtsi
new file mode 100644
index 0000000000..8dd4cfdc92
--- /dev/null
+++ b/target/linux/realtek/dts-5.10/rtl931x.dtsi
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/interrupt-controller/mips-gic.h>
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	
+	compatible = "realtek,rtl838x-soc";
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		frequency = <1000000000>;
+
+		cpu@0 {
+			compatible = "mti,interaptive";
+			reg = <0>;
+		};
+
+		cpu@1 {
+			compatible = "mti,interaptive";
+			reg = <1>;
+		};
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x10000000>;
+	};
+	
+	chosen {
+		bootargs = "console=ttyS0,38400";
+	};
+
+	lx_clk: lx_clk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <200000000>;
+	};
+
+	cpuclock: cpuclock@0 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+
+		/* FIXME: there should be way to detect this */
+		clock-frequency = <1000000000>;
+	};
+
+	cpuintc: cpuintc {
+		compatible = "mti,cpu-interrupt-controller";
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
+
+	gic: interrupt-controller@1ddc0000 {
+		compatible = "mti,gic";
+		reg = <0x1ddc0000 0x20000>;
+
+		interrupt-controller;
+		#interrupt-cells = <3>;
+
+		/*
+		 * Declare the interrupt-parent even though the mti,gic
+		 * binding doesn't require it, such that the kernel can
+		 * figure out that cpu_intc is the root interrupt
+		 * controller & should be probed first.
+		 */
+		interrupt-parent = <&cpuintc>;
+
+		timer {
+			compatible = "mti,gic-timer";
+			interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
+			clocks = <&cpuclock>;
+		};
+	};
+	
+	soc: soc {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x18000000 0x10000>;
+
+		spi0: spi@1200 {
+			status = "okay";
+
+			compatible = "realtek,rtl8380-spi";
+			reg = <0x1200 0x100>;
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		watchdog0: watchdog@3260 {
+			compatible = "realtek,rtl9310-wdt";
+			reg = <0x3260 0xc>;
+
+			realtek,reset-mode = "soc";
+
+			clocks = <&lx_clk>;
+			timeout-sec = <30>;
+
+			interrupt-parent = <&gic>;
+			interrupt-names = "phase1", "phase2";
+			interrupts = <GIC_SHARED 8 IRQ_TYPE_LEVEL_HIGH>, <GIC_SHARED 9 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
+		gpio0: gpio-controller@3300 {
+			compatible = "realtek,rtl9310-gpio", "realtek,otto-gpio";
+			reg = <0x3300 0x1c>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+			ngpios = <32>;
+
+			interrupt-controller;
+			#interrupt-cells = <3>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SHARED 20 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
+		uart0: uart@2000 {
+			compatible = "ns16550a";
+			reg = <0x2000 0x100>;
+
+			clock-frequency = <200000000>;
+
+			interrupt-parent = <&gic>;
+			#interrupt-cells = <3>;
+			interrupts = <GIC_SHARED 22 IRQ_TYPE_LEVEL_HIGH>;
+
+			reg-io-width = <1>;
+			reg-shift = <2>;
+			fifo-size = <1>;
+			no-loopback-test;
+		};
+
+		uart1: uart@2100 {
+			compatible = "ns16550a";
+			reg = <0x2100 0x100>;
+
+			clock-frequency = <200000000>;
+
+			interrupt-parent = <&gic>;
+			#interrupt-cells = <3>;
+			interrupts = <GIC_SHARED 23 IRQ_TYPE_LEVEL_HIGH>;
+
+			reg-io-width = <1>;
+			reg-shift = <2>;
+			fifo-size = <1>;
+			no-loopback-test;
+
+			status = "disabled";
+		};
+	};
+
+
+	ethernet0: ethernet@1b00a300 {
+		status = "okay";
+		compatible = "realtek,rtl838x-eth";
+		reg = <0x1b00a300 0x100>;
+		interrupt-parent = <&gic>;
+		#interrupt-cells = <3>;
+		interrupts = <GIC_SHARED 16 IRQ_TYPE_LEVEL_HIGH>;
+		phy-mode = "internal";
+		fixed-link {
+			speed = <1000>;
+			full-duplex;
+		};
+	};
+
+	switch0: switch@1b000000 {
+		compatible = "realtek,rtl83xx-switch";
+		status = "okay";
+
+		interrupt-parent = <&gic>;
+		#interrupt-cells = <3>;
+		interrupts = <GIC_SHARED 15 IRQ_TYPE_LEVEL_HIGH>;
+	};
+};
diff --git a/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/debugfs.c b/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/debugfs.c
index 0a1972aaf6..21f00096e5 100644
--- a/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/debugfs.c
+++ b/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/debugfs.c
@@ -45,6 +45,7 @@
 #define RTL838X_STAT_PRVTE_DROP_COUNTERS	(0x6A00)
 #define RTL839X_STAT_PRVTE_DROP_COUNTERS	(0x3E00)
 #define RTL930X_STAT_PRVTE_DROP_COUNTERS	(0xB5B8)
+#define RTL931X_STAT_PRVTE_DROP_COUNTERS	(0xd800)
 
 int rtl83xx_port_get_stp_state(struct rtl838x_switch_priv *priv, int port);
 void rtl83xx_port_stp_state_set(struct dsa_switch *ds, int port, u8 state);
@@ -106,6 +107,25 @@ const char *rtl930x_drop_cntr[] = {
 	"STACK_NONUC_BLOCKING_PMSK", "STACK_PORT_NOT_FOUND", "ACL_LOOPBACK_DROP", "IP6_ROUTING_EXT_HEADER"
 };
 
+const char *rtl931x_drop_cntr[] = {
+	"ALE_RX_GOOD_PKTS", "RX_MAX_FRAME_SIZE", "MAC_RX_DROP", "OPENFLOW_IP_MPLS_TTL", "OPENFLOW_TBL_MISS",
+	"IGR_BW", "SPECIAL_CONGEST", "EGR_QUEUE", "RESERVED", "EGR_LINK_STATUS", "STACK_UCAST_NONUCAST_TTL", // 10
+	"STACK_NONUC_BLOCKING_PMSK", "L2_CRC", "SRC_PORT_FILTER", "PARSER_PACKET_TOO_LONG", "PARSER_MALFORM_PACKET",
+	"MPLS_OVER_2_LBL", "EACL_METER", "IACL_METER", "PROTO_STORM", "INVALID_CAPWAP_HEADER", // 20
+	"MAC_IP_SUBNET_BASED_VLAN", "OAM_PARSER", "UC_MC_RPF", "IP_MAC_BINDING_MATCH_MISMATCH", "SA_BLOCK",
+	"TUNNEL_IP_ADDRESS_CHECK", "EACL_DROP", "IACL_DROP", "ATTACK_PREVENT", "SYSTEM_PORT_LIMIT_LEARN", // 30,
+	"OAMPDU", "CCM_RX", "CFM_UNKNOWN_TYPE", "LBM_LBR_LTM_LTR", "Y_1731", "VLAN_LIMIT_LEARN",
+	"VLAN_ACCEPT_FRAME_TYPE", "CFI_1", "STATIC_DYNAMIC_PORT_MOVING", "PORT_MOVE_FORBID", // 40
+	"L3_CRC", "BPDU_PTP_LLDP_EAPOL_RMA", "MSTP_SRC_DROP_DISABLED_BLOCKING", "INVALID_SA", "NEW_SA",
+	"VLAN_IGR_FILTER", "IGR_VLAN_CONVERT", "GRATUITOUS_ARP", "MSTP_SRC_DROP", "L2_HASH_FULL", // 50
+	"MPLS_UNKNOWN_LBL", "L3_IPUC_NON_IP", "TTL", "MTU", "ICMP_REDIRECT", "STORM_CONTROL", "L3_DIP_DMAC_MISMATCH",
+	"IP4_IP_OPTION", "IP6_HBH_EXT_HEADER", "IP4_IP6_HEADER_ERROR", // 60
+	"ROUTING_IP_ADDR_CHECK", "ROUTING_EXCEPTION", "DA_BLOCK", "OAM_MUX", "PORT_ISOLATION", "VLAN_EGR_FILTER",
+	"MIRROR_ISOLATE", "MSTP_DESTINATION_DROP", "L2_MC_BRIDGE", "IP_UC_MC_ROUTING_LOOK_UP_MISS", // 70
+	"L2_UC", "L2_MC", "IP4_MC", "IP6_MC", "L3_UC_MC_ROUTE", "UNKNOWN_L2_UC_FLPM", "BC_FLPM",
+	"VLAN_PRO_UNKNOWN_L2_MC_FLPM", "VLAN_PRO_UNKNOWN_IP4_MC_FLPM", "VLAN_PROFILE_UNKNOWN_IP6_MC_FLPM" // 80,
+};
+
 static ssize_t rtl838x_common_read(char __user *buffer, size_t count,
 					loff_t *ppos, unsigned int value)
 {
@@ -217,6 +237,11 @@ static ssize_t drop_counter_read(struct file *filp, char __user *buffer, size_t
 		offset = RTL930X_STAT_PRVTE_DROP_COUNTERS;
 		num = 85;
 		break;
+	case RTL9310_FAMILY_ID:
+		d = rtl931x_drop_cntr;
+		offset = RTL931X_STAT_PRVTE_DROP_COUNTERS;
+		num = 81;
+		break;
 	}
 
 	buf = kmalloc(30 * num, GFP_KERNEL);
diff --git a/target/linux/realtek/image/rtl931x.mk b/target/linux/realtek/image/rtl931x.mk
new file mode 100644
index 0000000000..a4e40e534e
--- /dev/null
+++ b/target/linux/realtek/image/rtl931x.mk
@@ -0,0 +1 @@
+# SPDX-License-Identifier: GPL-2.0-only
diff --git a/target/linux/realtek/patches-5.10/312-rt9313-support.patch b/target/linux/realtek/patches-5.10/312-rt9313-support.patch
new file mode 100644
index 0000000000..37a61106d2
--- /dev/null
+++ b/target/linux/realtek/patches-5.10/312-rt9313-support.patch
@@ -0,0 +1,74 @@
+--- a/arch/mips/Makefile
++++ b/arch/mips/Makefile
+@@ -307,14 +307,24 @@ endif
+ 
+ KBUILD_AFLAGS	+= $(cflags-y)
+ KBUILD_CFLAGS	+= $(cflags-y)
++ifdef CONFIG_931X
++KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
++bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y) \
++		  VMLINUX_ENTRY_ADDRESS=$(entry-y) \
++		  PLATFORM="$(platform-y)" \
++		  ITS_INPUTS="$(its-y)"
++else
+ KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) -DLINKER_LOAD_ADDRESS=$(load-ld)
+-KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
+-
+ bootvars-y	= VMLINUX_LOAD_ADDRESS=$(load-y) \
+ 		  LINKER_LOAD_ADDRESS=$(load-ld) \
+ 		  VMLINUX_ENTRY_ADDRESS=$(entry-y) \
+ 		  PLATFORM="$(platform-y)" \
+ 		  ITS_INPUTS="$(its-y)"
++endif
++KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
++
++
++
+ ifdef CONFIG_32BIT
+ bootvars-y	+= ADDR_BITS=32
+ endif
+--- a/arch/mips/kernel/head.S
++++ b/arch/mips/kernel/head.S
+@@ -60,12 +60,14 @@
+ 	.endm
+ 
+ #ifndef CONFIG_NO_EXCEPT_FILL
++#ifndef CONFIG_RTL931X
+ 	/*
+ 	 * Reserved space for exception handlers.
+ 	 * Necessary for machines which link their kernels at KSEG0.
+ 	 */
+ 	.fill	0x400
+ #endif
++#endif
+ 
+ EXPORT(_stext)
+ 
+@@ -79,11 +81,13 @@ FEXPORT(__kernel_entry)
+ 	j	kernel_entry
+ #endif /* CONFIG_BOOT_RAW */
+ 
++#ifndef CONFIG_RTL931X
+ #ifdef CONFIG_IMAGE_CMDLINE_HACK
+ 	.ascii	"CMDLINE:"
+ EXPORT(__image_cmdline)
+ 	.fill	0x400
+ #endif /* CONFIG_IMAGE_CMDLINE_HACK */
++#endif
+ 
+ 	__REF
+ 
+--- a/arch/mips/kernel/vmlinux.lds.S
++++ b/arch/mips/kernel/vmlinux.lds.S
+@@ -55,7 +55,11 @@ SECTIONS
+ 	/* . = 0xa800000000300000; */
+ 	. = 0xffffffff80300000;
+ #endif
++#ifdef CONFIG_RTL931X
++	. = 0x80220000;
++#else
+ 	. = LINKER_LOAD_ADDRESS;
++#endif
+ 	/* read-only */
+ 	_text = .;	/* Text and read-only data */
+ 	.text : {
diff --git a/target/linux/realtek/rtl931x/config-5.10 b/target/linux/realtek/rtl931x/config-5.10
new file mode 100644
index 0000000000..ac60938ddc
--- /dev/null
+++ b/target/linux/realtek/rtl931x/config-5.10
@@ -0,0 +1,223 @@
+CONFIG_ARCH_32BIT_OFF_T=y
+CONFIG_ARCH_HIBERNATION_POSSIBLE=y
+CONFIG_ARCH_MMAP_RND_BITS_MAX=15
+CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=15
+CONFIG_ARCH_SUSPEND_POSSIBLE=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_BLK_DEV_RAM_COUNT=16
+CONFIG_BLK_DEV_RAM_SIZE=4096
+CONFIG_CEVT_R4K=y
+CONFIG_CLKDEV_LOOKUP=y
+CONFIG_CLKSRC_MMIO=y
+CONFIG_CLONE_BACKWARDS=y
+CONFIG_COMMON_CLK=y
+CONFIG_COMMON_CLK_BOSTON=y
+CONFIG_COMPAT_32BIT_TIME=y
+CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
+CONFIG_CPU_BIG_ENDIAN=y
+CONFIG_CPU_GENERIC_DUMP_TLB=y
+CONFIG_CPU_HAS_DIEI=y
+CONFIG_CPU_HAS_PREFETCH=y
+CONFIG_CPU_HAS_RIXI=y
+CONFIG_CPU_HAS_SYNC=y
+CONFIG_CPU_MIPS32=y
+# CONFIG_CPU_MIPS32_R1 is not set
+CONFIG_CPU_MIPS32_R2=y
+CONFIG_CPU_MIPSR2=y
+CONFIG_CPU_NEEDS_NO_SMARTMIPS_OR_MICROMIPS=y
+CONFIG_CPU_R4K_CACHE_TLB=y
+CONFIG_CPU_SUPPORTS_32BIT_KERNEL=y
+CONFIG_CPU_SUPPORTS_HIGHMEM=y
+CONFIG_CPU_SUPPORTS_MSA=y
+CONFIG_MIPS_MT=y
+CONFIG_MIPS_MT_FPAFF=y
+CONFIG_MIPS_MT_SMP=y
+# CONFIG_MIPS_NO_APPENDED_DTB is not set
+CONFIG_MIPS_NR_CPU_NR_MAP=4
+CONFIG_HIGHMEM=y
+CONFIG_CRYPTO_GF128MUL=y
+CONFIG_CRYPTO_LIB_POLY1305_RSIZE=2
+CONFIG_CRYPTO_NULL2=y
+CONFIG_CRYPTO_RNG2=y
+CONFIG_CSRC_R4K=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_SECTION_MISMATCH=y
+CONFIG_DMA_NONCOHERENT=y
+CONFIG_DTC=y
+CONFIG_EARLY_PRINTK=y
+CONFIG_FIXED_PHY=y
+CONFIG_FW_LOADER_PAGED_BUF=y
+CONFIG_GENERIC_ATOMIC64=y
+CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_GENERIC_CMOS_UPDATE=y
+CONFIG_GENERIC_CPU_AUTOPROBE=y
+CONFIG_GENERIC_GETTIMEOFDAY=y
+CONFIG_GENERIC_IOMAP=y
+CONFIG_GENERIC_IRQ_CHIP=y
+CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK=y
+CONFIG_GENERIC_IRQ_SHOW=y
+CONFIG_GENERIC_LIB_ASHLDI3=y
+CONFIG_GENERIC_LIB_ASHRDI3=y
+CONFIG_GENERIC_LIB_CMPDI2=y
+CONFIG_GENERIC_LIB_LSHRDI3=y
+CONFIG_GENERIC_LIB_UCMPDI2=y
+CONFIG_GENERIC_PCI_IOMAP=y
+CONFIG_GENERIC_PHY=y
+CONFIG_GENERIC_PINCONF=y
+CONFIG_GENERIC_PINCTRL_GROUPS=y
+CONFIG_GENERIC_PINMUX_FUNCTIONS=y
+CONFIG_GENERIC_SCHED_CLOCK=y
+CONFIG_GENERIC_SMP_IDLE_THREAD=y
+CONFIG_GENERIC_TIME_VSYSCALL=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIOLIB_IRQCHIP=y
+CONFIG_GPIO_REALTEK_OTTO=y
+CONFIG_GPIO_GENERIC=y
+CONFIG_GPIO_RTL8231=y
+CONFIG_GRO_CELLS=y
+CONFIG_HANDLE_DOMAIN_IRQ=y
+CONFIG_HARDWARE_WATCHPOINTS=y
+CONFIG_HAS_DMA=y
+CONFIG_HAS_IOMEM=y
+CONFIG_HAS_IOPORT_MAP=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_HWMON=y
+CONFIG_HZ_PERIODIC=y
+CONFIG_I2C=y
+CONFIG_I2C_ALGOBIT=y
+CONFIG_I2C_BOARDINFO=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_GPIO=y
+CONFIG_I2C_MUX=y
+CONFIG_I2C_MUX_RTL9300=y
+CONFIG_I2C_RTL9300=y
+CONFIG_I2C_SMBUS=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_IRQCHIP=y
+CONFIG_IRQ_DOMAIN=y
+CONFIG_IRQ_FORCED_THREADING=y
+CONFIG_IRQ_MIPS_CPU=y
+CONFIG_IRQ_WORK=y
+CONFIG_JFFS2_ZLIB=y
+CONFIG_LEDS_GPIO=y
+CONFIG_LEGACY_PTYS=y
+CONFIG_LEGACY_PTY_COUNT=256
+CONFIG_LIBFDT=y
+CONFIG_LLD_VERSION=0
+CONFIG_LOCK_DEBUGGING_SUPPORT=y
+CONFIG_MARVELL_PHY=y
+CONFIG_MDIO_BUS=y
+CONFIG_MDIO_DEVICE=y
+CONFIG_MDIO_DEVRES=y
+CONFIG_MDIO_I2C=y
+CONFIG_MDIO_SMBUS=y
+CONFIG_MEMFD_CREATE=y
+CONFIG_MFD_SYSCON=y
+CONFIG_MIGRATION=y
+CONFIG_MIPS=y
+CONFIG_MIPS_ASID_BITS=8
+CONFIG_MIPS_ASID_SHIFT=0
+CONFIG_MIPS_CBPF_JIT=y
+CONFIG_MIPS_CLOCK_VSYSCALL=y
+# CONFIG_MIPS_CMDLINE_DTB_EXTEND is not set
+# CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER is not set
+CONFIG_MIPS_CMDLINE_FROM_DTB=y
+# CONFIG_MIPS_ELF_APPENDED_DTB is not set
+CONFIG_MIPS_L1_CACHE_SHIFT=5
+CONFIG_MIPS_LD_CAN_LINK_VDSO=y
+# CONFIG_MIPS_NO_APPENDED_DTB is not set
+CONFIG_MIPS_RAW_APPENDED_DTB=y
+CONFIG_MIPS_SPRAM=y
+CONFIG_MODULES_USE_ELF_REL=y
+CONFIG_MTD_CFI_ADV_OPTIONS=y
+CONFIG_MTD_CFI_GEOMETRY=y
+CONFIG_MTD_CMDLINE_PARTS=y
+CONFIG_MTD_JEDECPROBE=y
+CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPLIT_BRNIMAGE_FW=y
+CONFIG_MTD_SPLIT_EVA_FW=y
+CONFIG_MTD_SPLIT_FIRMWARE=y
+CONFIG_MTD_SPLIT_TPLINK_FW=y
+CONFIG_MTD_SPLIT_UIMAGE_FW=y
+CONFIG_NEED_DMA_MAP_STATE=y
+CONFIG_NEED_PER_CPU_KM=y
+CONFIG_NET_DEVLINK=y
+CONFIG_NET_DSA=y
+CONFIG_NET_DSA_RTL83XX=y
+CONFIG_NET_DSA_TAG_RTL83XX=y
+CONFIG_NET_DSA_TAG_TRAILER=y
+CONFIG_NET_RTL838X=y
+CONFIG_NET_SWITCHDEV=y
+CONFIG_NO_GENERIC_PCI_IOPORT_MAP=y
+CONFIG_NVMEM=y
+CONFIG_OF=y
+CONFIG_OF_ADDRESS=y
+CONFIG_OF_EARLY_FLATTREE=y
+CONFIG_OF_FLATTREE=y
+CONFIG_OF_GPIO=y
+CONFIG_OF_IRQ=y
+CONFIG_OF_KOBJ=y
+CONFIG_OF_MDIO=y
+CONFIG_OF_NET=y
+CONFIG_PCI_DRIVERS_LEGACY=y
+CONFIG_PERF_USE_VMALLOC=y
+CONFIG_PGTABLE_LEVELS=2
+CONFIG_PHYLIB=y
+CONFIG_PHYLINK=y
+CONFIG_PINCTRL=y
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_SYSCON=y
+CONFIG_RATIONAL=y
+# CONFIG_REALTEK_PHY is not set
+CONFIG_REALTEK_SOC_PHY=y
+CONFIG_REGMAP=y
+CONFIG_REGMAP_MMIO=y
+CONFIG_RESET_CONTROLLER=y
+CONFIG_RTL838X=y
+# CONFIG_RTL9300_TIMER is not set
+CONFIG_SENSORS_GPIO_FAN=y
+CONFIG_SENSORS_LM75=y
+CONFIG_SERIAL_MCTRL_GPIO=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_SFP=y
+CONFIG_SPI=y
+CONFIG_SPI_MASTER=y
+CONFIG_SPI_MEM=y
+CONFIG_SRCU=y
+CONFIG_SWPHY=y
+CONFIG_SYSCTL_EXCEPTION_TRACE=y
+CONFIG_SYS_HAS_CPU_MIPS32_R1=y
+CONFIG_SYS_HAS_CPU_MIPS32_R2=y
+CONFIG_SYS_HAS_EARLY_PRINTK=y
+CONFIG_SYS_SUPPORTS_32BIT_KERNEL=y
+CONFIG_SYS_SUPPORTS_ARBIT_HZ=y
+CONFIG_SYS_SUPPORTS_BIG_ENDIAN=y
+CONFIG_SYS_SUPPORTS_MIPS16=y
+CONFIG_TARGET_ISA_REV=2
+CONFIG_TICK_CPU_ACCOUNTING=y
+CONFIG_TIMER_OF=y
+CONFIG_TIMER_PROBE=y
+CONFIG_TINY_SRCU=y
+# CONFIG_USE_GENERIC_EARLY_PRINTK_8250 is not set
+CONFIG_USE_OF=y
+CONFIG_ZLIB_DEFLATE=y
+CONFIG_ZLIB_INFLATE=y
+CONFIG_FORCE_MAX_ZONEORDER=13
+# CONFIG_MIPS_VPE_LOADER is not set
+CONFIG_MIPS_CPU_SCACHE=y
+CONFIG_SPI_RTL838X=y
+CONFIG_MIPS_MT_SMP=y
+CONFIG_MIPS_CPC=y
+CONFIG_MIPS_CPS=y
+CONFIG_MIPS_PM=y
+# CONFIG_MIPS_CMP is not set
+CONFIG_MIPS_CPS_CPUIDLE=y
+# CONFIG_MIPS_CPS_NS16550_BOOL is not set
+CONFIG_SMP=y
+CONFIG_NR_CPUS=2
+CONFIG_RTL83XX=y
+# CONFIG_RTL838X is not set
+# CONFIG_RTL839X is not set
+CONFIG_RTL930X=y
+CONFIG_RTL931X=y
+CONFIG_REALTEK_OTTO_WDT=y
diff --git a/target/linux/realtek/rtl931x/target.mk b/target/linux/realtek/rtl931x/target.mk
new file mode 100644
index 0000000000..39892e5484
--- /dev/null
+++ b/target/linux/realtek/rtl931x/target.mk
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ARCH:=mips
+SUBTARGET:=rtl931x
+CPU_TYPE:=24kc
+BOARD:=realtek
+BOARDNAME:=Realtek MIPS RTL931X
+
+KERNEL_PATCHVER:=5.10
+
+define Target/Description
+	Build firmware images for Realtek RTL931x based boards.
+endef