mediatek: add support for Buffalo WSR-2533DHP2

This adds support for the Buffalo WSR-2533DHP2.

The device uses the Broadcom TRX image format with a special magic. To
be able to boot the images or load them they have to be wrapped with
different headers depending how it is loaded.

There are multiple ways to install OpenWrt on this device.
Boot ramdisk from U-Boot
----------------------------
This will load the image and not write it into the flash.

1. Stop boot menu with "space" key
2. Select "System Load Linux to SDRAM via TFTP."
3. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-initramfs-kernel.bin
4. The system boots the image

Write to flash from U-Boot
-----------------------------
This will load the image over tftp and directly write it into the flash.

1. Stop boot menu with "space" key
2. Select "System Load Linux Kernel then write to Flash via TFTP."
3. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-squashfs-factory-uboot.bin
4. The system writes this image into the flash and boots into it.

Write to flash from Web UI
-----------------------------
This will load the image over over the Web UI and write it into the flash

1. Open the Web UI
2. Go to "管理" -> "ファームウェア更新"
3. Select "ローカルファイル指定" and click "更新実行"
4. Load this image:
   openwrt-mediatek-mt7622-buffalo_wsr-2533dhp2-squashfs-factory.bin
5. The system writes this image into the flash and boots into it.

Specifications
-------------------
* SoC:       MT7622 (4x4 2.4 GHz Wifi)
* Wifi:      MT7615 (4x4 5 GHz Wifi)
* Flash:     Winbond W29N01HZ 128MB SLC NAND
* RAM        256MB
* Ethernet:  Realtek RTL8367S (5 x 1GBit/s, SoC via 2.5GBit/s)

Co-Developed-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 340 insertions, 0 deletions

diff --git a/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts b/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts
new file mode 100644
index 0000000000..397be1445b
--- /dev/null
+++ b/target/linux/mediatek/dts/mt7622-buffalo-wsr-2533dhp2.dts
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+#include "mt7622.dtsi"
+#include "mt6380.dtsi"
+
+/ {
+	model = "Buffalo WSR-2533DHP2";
+	compatible = "buffalo,wsr-2533dhp2", "mediatek,mt7622";
+
+	aliases {
+		serial0 = &uart0;
+		led-boot = &power_green;
+		led-failsafe = &power_amber;
+		led-running = &power_green;
+		led-upgrade = &power_green;
+	};
+
+	chosen {
+		bootargs = "earlycon=uart8250,mmio32,0x11002000 console=ttyS0,115200n8 swiotlb=512";
+	};
+
+	memory {
+		reg = <0 0x40000000 0 0x0F000000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wireless_amber {
+			label = "amber:wireless";
+			gpios = <&pio 2 GPIO_ACTIVE_HIGH>;
+		};
+
+		power_amber: power_amber {
+			label = "amber:power";
+			gpios = <&pio 3 GPIO_ACTIVE_LOW>;
+		};
+
+		power_green: power_green {
+			label = "green:power";
+			gpios = <&pio 4 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wireless_green {
+			label = "green:wireless";
+			gpios = <&pio 15 GPIO_ACTIVE_HIGH>;
+		};
+
+		internet {
+			label = "green:internet";
+			gpios = <&pio 19 GPIO_ACTIVE_HIGH>;
+		};
+
+		router {
+			label = "green:router";
+			gpios = <&pio 20 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+		poll-interval = <100>;
+
+		reset {
+			label = "reset";
+			gpios = <&pio 0 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		/* GPIO 1 and 16 are a tri-state switch button with
+		 * ROUTER / AP / WB.
+		 */
+		router {
+			label = "router";
+			gpios = <&pio 1 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_0>;
+			linux,input-type = <EV_SW>;
+		};
+
+		bridge {
+			label = "wb";
+			gpios = <&pio 16 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_1>;
+			linux,input-type = <EV_SW>;
+		};
+
+		/* GPIO 18 is a switch button with AUTO / MANUAL. */
+		manual {
+			label = "manual";
+			gpios = <&pio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <BTN_2>;
+			linux,input-type = <EV_SW>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&pio 102 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+	};
+
+	rtkgsw: rtkgsw@0 {
+		compatible = "mediatek,rtk-gsw";
+		mediatek,ethsys = <&ethsys>;
+		mediatek,mdio = <&mdio>;
+		mediatek,reset-pin = <&pio 54 GPIO_ACTIVE_HIGH>;
+	};
+};
+
+&cpu0 {
+	proc-supply = <&mt6380_vcpu_reg>;
+	sram-supply = <&mt6380_vm_reg>;
+};
+
+&cpu1 {
+	proc-supply = <&mt6380_vcpu_reg>;
+	sram-supply = <&mt6380_vm_reg>;
+};
+
+&pcie0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie0_pins>;
+	status = "okay";
+};
+
+&slot0 {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x5000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&pio {
+	eth_pins: eth-pins {
+		mux {
+			function = "eth";
+			groups = "mdc_mdio", "rgmii_via_gmac2";
+		};
+	};
+
+	/* Parallel nand is shared pin with eMMC */
+	parallel_nand_pins: parallel-nand-pins {
+		mux {
+			function = "flash";
+			groups = "par_nand";
+		};
+
+		conf-cmd-dat {
+			pins = "NCEB", "NWEB", "NREB",
+				  "NDL4", "NDL5", "NDL6",
+				  "NDL7", "NRB", "NCLE",
+				  "NALE", "NDL0", "NDL1",
+				  "NDL2", "NDL3";
+			input-enable;
+			drive-strength = <8>;
+			bias-pull-up;
+		};
+	};
+
+	pcie0_pins: pcie0-pins {
+		mux {
+			function = "pcie";
+			groups = "pcie0_pad_perst",
+				 "pcie0_1_waken",
+				 "pcie0_1_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";
+		};
+	};
+
+	uart0_pins: uart0-pins {
+		mux {
+			function = "uart";
+			groups = "uart0_0_tx_rx" ;
+		};
+	};
+
+	watchdog_pins: watchdog-pins {
+		mux {
+			function = "watchdog";
+			groups = "watchdog";
+		};
+	};
+};
+
+&bch {
+	status = "okay";
+};
+
+&eth {
+	pinctrl-names = "default";
+	pinctrl-0 = <&eth_pins>;
+	status = "okay";
+
+	gmac0: mac@0 {
+		compatible = "mediatek,eth-mac";
+		reg = <0>;
+
+		phy-connection-type = "2500base-x";
+
+		mtd-mac-address = <&factory 0x4>;
+		mtd-mac-address-increment = <(-1)>;
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+		};
+	};
+
+	mdio: mdio-bus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+};
+
+&nandc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&parallel_nand_pins>;
+	status = "okay";
+
+	nand@0 {
+		reg = <0>;
+		nand-ecc-mode = "hw";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "Preloader";
+				reg = <0x0 0x80000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "ATF";
+				reg = <0x80000 0x40000>;
+				read-only;
+			};
+
+			partition@c0000 {
+				label = "Bootloader";
+				reg = <0xc0000 0x80000>;
+				read-only;
+			};
+
+			partition@140000 {
+				label = "Config";
+				reg = <0x140000 0x80000>;
+				read-only;
+			};
+
+			factory: partition@1c0000 {
+				label = "factory";
+				reg = <0x1c0000 0x40000>;
+				read-only;
+			};
+
+			partition@200000 {
+				compatible = "brcm,trx";
+				trx-magic = <0x32504844>;
+				label = "firmware";
+				reg = <0x200000 0x3a00000>;
+			};
+
+			partition@3C00000 {
+				label = "Kernel2";
+				reg = <0x3c00000 0x3a00000>;
+			};
+
+			partition@7600000 {
+				label = "glbcfg";
+				reg = <0x7600000 0x200000>;
+				read-only;
+			};
+
+			partition@7800000 {
+				label = "board_data";
+				reg = <0x7800000 0x200000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&pwm {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm7_pins>;
+	status = "okay";
+};
+
+&pwrap {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pmic_bus_pins>;
+	status = "okay";
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+	status = "okay";
+};
+
+&watchdog {
+	pinctrl-names = "default";
+	pinctrl-0 = <&watchdog_pins>;
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mediatek,mtd-eeprom = <&factory 0x0>;
+};
+
+&rtc {
+	status = "disabled";
+};