mediatek: add Linksys E8450 support

The Linksys E8450, also known as Belkin RT3200, is a dual-band
IEEE 802.11bgn/ac/ax router based on MediaTek MT7622BV and
MediaTek MT7915AN chips.

FCC: K7S-03571 and K7S-03572

Hardware highlights:
 - CPU: MediaTek MT7622BV (2x ARM Cortex-A53 @ 1350 MHz max.)
 - RAM: 512MB DDR3
 - Flash: 128MB SPI-NAND (2k+64)
 - Ethernet: MT7531BE switch with 5 1000Base-T ports
             CPU port connected with 2500Base-X
 - WiFi 2.4 GHz: 802.11bgn 4T4R built-in antennas
                 MT7622VB built-in
 - WiFi   5 GHz: 802.11ac/ax 4T4R built-in antennas
                 MT7915AN chip on-board via PCIe
                 MT7975AN front-end
 - Buttons: Reset and WPS
 - LEDS: 3 user controllable LEDs, 4 wired to switch
 - USB: USB2.0, single port
 - no Bluetooth (supported by SoC, not wired on board)
 - Serial: JST PH 2.0MM 6 Pin connector inside device
            ----_____________----
           [  GND RX - TX  -  -  ]
            ---------------------
 - JTAG:   unpopulated ARM JTAG 20-pin connector (works)

This commit adds support for the device in a way that is compatible
with the vendor firmware's bootloader and dual-boot flash layout, the
resulting image can directly be flashed using the vendor firmware.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 486 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7622-linksys-e8450.dts b/target/linux/mediatek/dts/mt7622-linksys-e8450.dts
new file mode 100644
index 0000000000..719e1d9230
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7622-linksys-e8450.dts
@@ -0,0 +1,486 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR MIT)
+
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "mt7622.dtsi"
+#include "mt6380.dtsi"
+
+/ {
+	model = "Linksys E8450";
+	compatible = "linksys,e8450", "mediatek,mt7622";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &led_power;
+		led-failsafe = &led_power;
+		led-running = &led_power;
+		led-upgrade = &led_power;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs = "earlycon=uart8250,mmio32,0x11002000 console=ttyS0,115200n1 swiotlb=512";
+	};
+
+	cpus {
+		cpu@0 {
+			proc-supply = <&mt6380_vcpu_reg>;
+			sram-supply = <&mt6380_vm_reg>;
+		};
+
+		cpu@1 {
+			proc-supply = <&mt6380_vcpu_reg>;
+			sram-supply = <&mt6380_vm_reg>;
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		factory {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&pio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&pio 102 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		led_power: power_blue {
+			label = "power:blue";
+			gpios = <&pio 95 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		power_orange {
+			label = "power:orange";
+			gpios = <&pio 96 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+		inet_blue {
+			label = "inet:blue";
+			gpios = <&pio 97 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+
+		inet_orange {
+			label = "inet:orange";
+			gpios = <&pio 98 GPIO_ACTIVE_LOW>;
+			default-state = "off";
+		};
+	};
+
+	memory {
+		reg = <0 0x40000000 0 0x40000000>;
+	};
+
+	reg_1p8v: regulator-1p8v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-3.3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	reg_5v: regulator-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-5V";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+};
+
+&bch {
+	status = "okay";
+};
+
+&btif {
+	status = "okay";
+};
+
+&cir {
+	pinctrl-names = "default";
+	pinctrl-0 = <&irrx_pins>;
+	status = "okay";
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&eth_pins>;
+	status = "okay";
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+		phy-mode = "2500base-x";
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
+	mdio-bus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		switch@0 {
+			compatible = "mediatek,mt7531";
+			reg = <0>;
+			reset-gpios = <&pio 54 0>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					label = "lan1";
+				};
+
+				port@1 {
+					reg = <1>;
+					label = "lan2";
+				};
+
+				port@2 {
+					reg = <2>;
+					label = "lan3";
+				};
+
+				port@3 {
+					reg = <3>;
+					label = "lan4";
+				};
+
+				port@4 {
+					reg = <4>;
+					label = "wan";
+				};
+
+				port@6 {
+					reg = <6>;
+					label = "cpu";
+					ethernet = <&gmac0>;
+					phy-mode = "2500base-x";
+
+					fixed-link {
+						speed = <2500>;
+						full-duplex;
+						pause;
+					};
+				};
+			};
+		};
+
+	};
+};
+
+&pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie0_pins>;
+	status = "okay";
+};
+
+&pcie1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie1_pins>;
+	status = "okay";
+};
+
+&slot0 {
+	mt7915@0,0 {
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x05000>;
+	};
+};
+
+&pio {
+	/* Attention: GPIO 90 is used to switch between PCIe@1,0 and
+	 * SATA functions. i.e. output-high: PCIe, output-low: SATA
+	 */
+//	asm_sel {
+//		gpio-hog;
+//		gpios = <90 GPIO_ACTIVE_HIGH>;
+//		output-high;
+//	};
+
+	eth_pins: eth-pins {
+		mux {
+			function = "eth";
+			groups = "mdc_mdio", "rgmii_via_gmac2";
+		};
+	};
+
+	irrx_pins: irrx-pins {
+		mux {
+			function = "ir";
+			groups =  "ir_1_rx";
+		};
+	};
+
+	irtx_pins: irtx-pins {
+		mux {
+			function = "ir";
+			groups =  "ir_1_tx";
+		};
+	};
+
+	pcie0_pins: pcie0-pins {
+		mux {
+			function = "pcie";
+			groups = "pcie0_pad_perst",
+				 "pcie0_1_waken",
+				 "pcie0_1_clkreq";
+		};
+	};
+
+	pcie1_pins: pcie1-pins {
+		mux {
+			function = "pcie";
+			groups = "pcie1_pad_perst",
+				 "pcie1_0_waken",
+				 "pcie1_0_clkreq";
+		};
+	};
+
+	pmic_bus_pins: pmic-bus-pins {
+		mux {
+			function = "pmic";
+			groups = "pmic_bus";
+		};
+	};
+
+	pwm7_pins: pwm1-2-pins {
+		mux {
+			function = "pwm";
+			groups = "pwm_ch7_2";
+		};
+	};
+
+	wled_pins: wled-pins {
+		mux {
+			function = "led";
+			groups = "wled";
+		};
+	};
+
+	/* Serial NAND is shared pin with SPI-NOR */
+	serial_nand_pins: serial-nand-pins {
+		mux {
+			function = "flash";
+			groups = "snfi";
+		};
+	};
+
+	spic0_pins: spic0-pins {
+		mux {
+			function = "spi";
+			groups = "spic0_0";
+		};
+	};
+
+	spic1_pins: spic1-pins {
+		mux {
+			function = "spi";
+			groups = "spic1_0";
+		};
+	};
+
+	uart0_pins: uart0-pins {
+		mux {
+			function = "uart";
+			groups = "uart0_0_tx_rx" ;
+		};
+	};
+
+	uart2_pins: uart2-pins {
+		mux {
+			function = "uart";
+			groups = "uart2_1_tx_rx" ;
+		};
+	};
+
+	watchdog_pins: watchdog-pins {
+		mux {
+			function = "watchdog";
+			groups = "watchdog";
+		};
+	};
+};
+
+&pwm {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm7_pins>;
+	status = "okay";
+};
+
+&pwrap {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pmic_bus_pins>;
+
+	status = "okay";
+};
+
+&sata {
+	status = "disabled";
+};
+
+&sata_phy {
+	status = "disabled";
+};
+
+&snfi {
+	pinctrl-names = "default";
+	pinctrl-0 = <&serial_nand_pins>;
+	status = "okay";
+
+	spi_nand@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		spi-max-frequency = <104000000>;
+		reg = <0>;
+
+		mediatek,bmt-v2;
+		mediatek,bmt-table-size = <0x1000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "Preloader";
+				reg = <0x00000 0x0080000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "ATF";
+				reg = <0x80000 0x0040000>;
+			};
+
+			partition@c0000 {
+				label = "u-boot";
+				reg = <0xc0000 0x0080000>;
+			};
+
+			partition@140000 {
+				label = "u-boot-env";
+				reg = <0x140000 0x0080000>;
+			};
+
+			factory: partition@1c0000 {
+				label = "factory";
+				reg = <0x1c0000 0x0100000>;
+			};
+
+			partition@300000 {
+				label = "devinfo";
+				reg = <0x300000 0x020000>;
+			};
+
+			partition@320000 {
+				label = "senv";
+				reg = <0x320000 0x020000>;
+			};
+
+			partition@360000 {
+				label = "bootseq";
+				reg = <0x360000 0x020000>;
+			};
+
+			partition@500000 {
+				label = "firmware1";
+				compatible = "denx,fit";
+				openwrt,cmdline-match = "mtdparts=master";
+				reg = <0x500000 0x1E00000>;
+			};
+
+			partition@2300000 {
+				label = "firmware2";
+				compatible = "denx,fit";
+				openwrt,cmdline-match = "mtdparts=slave";
+				reg = <0x2300000 0x1E00000>;
+			};
+
+			partition@4100000 {
+				label = "data";
+				reg = <0x4100000 0x1900000>;
+			};
+
+			partition@5100000 {
+				label = "mfg";
+				reg = <0x5a00000 0x1400000>;
+			};
+		};
+	};
+};
+
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spic0_pins>;
+	status = "okay";
+};
+
+&spi1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spic1_pins>;
+	status = "okay";
+};
+
+&ssusb {
+	vusb33-supply = <&reg_3p3v>;
+	vbus-supply = <&reg_5v>;
+	status = "okay";
+};
+
+&u3phy {
+	status = "okay";
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+	status = "okay";
+};
+
+&uart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart2_pins>;
+	status = "okay";
+};
+
+&watchdog {
+	pinctrl-names = "default";
+	pinctrl-0 = <&watchdog_pins>;
+	status = "okay";
+};
+
+&wmac {
+	mediatek,mtd-eeprom = <&factory 0x0000>;
+	status = "okay";
+};