ramips: mt7621: add support for Netgear R6800

This patch adds support for the Netgear R6800, aka Netgear AC1900 and
R6800-100PES.

Specification:
- SoC: MediaTek MT7621AT (880 MHz)
- Flash: 128 MiB NAND
- RAM: 256 MiB
- Wireless: MediaTek MT7615EN b/g/n , MediaTek MT7615EN an+ac
- LAN speed: 10/100/1000
- LAN ports: 4
- WAN speed: 10/100/1000
- WAN ports: 1
- USB 2.0
- USB 3.0
- Serial baud rate of Bootloader and factory firmware: 57600

Known issues:
- Device has 3 wifi LEDs: Wifi 5Ghz, Wifi 2.4Ghz and Wifi on/off.
  Wifi on/off is not used.

Installation:
- apply factory image via stock web-gui.

Back to stock:
- nmrpflash can be used to recover to the stock Netgear firmware.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

1 files changed, 125 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi b/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi
new file mode 100644
index 0000000000..6538b6926e
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_netgear_sercomm_bzv.dtsi
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "mediatek,mt7621-soc";
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		wps {
+			label = "wps";
+			gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+
+		rfkill {
+			label = "rfkill";
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RFKILL>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0>;
+		ieee80211-freq-limit = <2400000 2500000>;
+	};
+};
+
+&pcie1 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x8000>;
+		ieee80211-freq-limit = <5000000 6000000>;
+	};
+};
+
+&ethernet {
+	mtd-mac-address = <&factory 0x4>;
+};
+
+&i2c {
+	status = "okay";
+
+	gpio_expander: i2c0gpio-expander@20{
+		#gpio-cells = <2>;
+		#interrupt-cells = <2>;
+		compatible = "semtech,sx1503q";
+		reg = <0x20>;
+
+		gpio-controller;
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x100000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "SC PART_MAP";
+			reg = <0x100000 0x100000>;
+			read-only;
+		};
+
+		partition@200000 {
+			label = "kernel";
+			reg = <0x200000 0x400000>;
+		};
+
+		partition@600000 {
+			label = "ubi";
+			reg = <0x600000 0x2800000>;
+		};
+
+		partition@2e00000 {
+			label = "reserved0";
+			reg = <0x2e00000 0x1800000>;
+			read-only;
+		};
+
+		factory: partition@4600000 {
+			label = "factory";
+			reg = <0x4600000 0x200000>;
+			read-only;
+		};
+
+		partition@4800000 {
+			label = "reserved1";
+			reg = <0x4800000 0x3800000>;
+			read-only;
+		};
+	};
+};