ramips: add support for Qding QC202

This is a smart door lock device equipped with OpenWrt 14.07 OEM
modified version Qdwrt

The OEM has closed down, This commit is intended to maximize the
remaining value of these devices. It can flash OpenWrt to become
an AP

Specification:
- SoC: MediaTek MT7628NN
- Flash: 8 MB
- RAM: 64 MB
- Power: DC 5V - 25V
- Ethernet: 1 x RJ45 (10/100 Mbps)
- Wireless radio: 802.11n 2.4g-only
- On-Board LED:
  Status 1: GPIO/43 active-low
  Status 2: GPIO/44 active-low
  Power: AlwaysOn
- Button:
  WPS / RESET: GPIO/14  active-low
- Bluetooth: CC2541 via UART1 (ttyS1) and GPIO/26-29
- RFID: MF RC522 on I2C@28
- RTC: DS1339 on I2C@68
- Shell (via CON1 cable)
  - LED (Swipe card area):
     -  Green  GPIO/3  active-high
     -  Red    GPIO/11 active-high
  - Matrix keypad: (active-low)
                 GPIO/20 GPIO/21 GPIO/19 (Rows)
        GPIO/24        1       2       3
        GPIO/25        4       5       6
        GPIO/22        7       8       9
        GPIO/23     BACK       0   ENTER
        (Cols)
- UART: 1 x UART on PCB - 57600 8N1
- GPIO Relay: GPIO/42 active-high
- GPIO Buzzer: GPIO/15 active-high

Warning:
The original firmware does not use the device tree.
This device tree is written based on the content of /sys/devices/platform
and has been tested

Note:
- On the device, matrix keypad rows actually are columns, and the columns actually are rows
- The key code of the CLEAR key of the matrix keypad is BACK in the original firmware.

Issue:
- No drivers in mainline kernel for RFID and Bluetooth.

Flash Instruction:
Using SSH/Telnet:
1. Connect the board to the computer via RJ45 Ethernet
2. Login 10.10.10.1 with root password "szqdingnet123" (SSH Port 22, Telnet Port 9900)
3. Download openwrt firmware on the computer.
4. Setup a http server on computer. And use wget download openwrt firmware from computer
5. Use command "mtd -r write openwrt-ramips-mt76x8-qding_qc202-squashfs-sysupgrade.bin firmware"
   to flash

Using U-Boot WebUI:
1. Configure PC with a static IP address 10.10.10.2/24.
2. Open http://10.10.10.1
3. Use "mkqdimg -B qc202 -f openwrt-ramips-mt76x8-qding_qc202-squashfs-sysupgrade.bin" to
   make image.
4. Upload factory.bin via U-Boot WebUI.

Original Firmware Dump / More details:
https://blog.gov.cooking/archives/research-qianding-smart-locker-and-flash.html

Original U-Boot firmware image tools:
https://gitlab.com/CoiaPrant/mkqdimg

Signed-off-by: Coia Prant <coiaprant@gmail.com>
Tested-by: Coia Prant <coiaprant@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17471
(cherry picked from commit b2f814fed469f435fbb6b5ec9f79e1012caabc3f)
Link: https://github.com/openwrt/openwrt/pull/20159
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

4 files changed, 252 insertions, 0 deletions

diff --git a/package/boot/uboot-envtools/files/ramips b/package/boot/uboot-envtools/files/ramips
index b0f8c1c168..08f8faa7dc 100644
--- a/package/boot/uboot-envtools/files/ramips
+++ b/package/boot/uboot-envtools/files/ramips
@@ -22,6 +22,7 @@ engenius,esr600h|\
 hongdian,h8922-v30|\
 linksys,re7000|\
 meig,slt866|\
+qding,qc202|\
 sitecom,wlr-4100-v1-002|\
 zyxel,keenetic-lite-iii-a)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x1000" "0x1000"
diff --git a/target/linux/ramips/dts/mt7628an_qding_qc202.dts b/target/linux/ramips/dts/mt7628an_qding_qc202.dts
new file mode 100644
index 0000000000..a187f19b54
--- /dev/null
+++ b/target/linux/ramips/dts/mt7628an_qding_qc202.dts
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7628an.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	compatible = "qding,qc202", "mediatek,mt7628an-soc";
+	model = "Qding QC202";
+
+	aliases {
+		led-boot = &led_status_1;
+		led-failsafe = &led_status_1;
+		led-running = &led_status_1;
+		led-upgrade = &led_status_1;
+		label-mac-device = &wmac;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led-indicator-green {
+			gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_INDICATOR;
+		};
+
+		led-indicator-red {
+			gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_INDICATOR;
+		};
+
+		led_status_1: led-status-1 {
+			gpios = <&gpio 43 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_WHITE>;
+			function-enumerator = <1>;
+			function = LED_FUNCTION_STATUS;
+		};
+
+		led-status-2 {
+			gpios = <&gpio 44 GPIO_ACTIVE_LOW>;
+			color = <LED_COLOR_ID_WHITE>;
+			function-enumerator = <2>;
+			function = LED_FUNCTION_STATUS;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	beeper {
+		compatible = "gpio-beeper";
+		gpios = <&gpio 15 GPIO_ACTIVE_HIGH>;
+	};
+
+	gpio-export {
+		compatible = "gpio-export";
+
+		// When device is disassembled, GPIO will be activated
+		disassemble {
+			gpio-export,name = "disassemble";
+			gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+		};
+
+		cc2541-boot {
+			gpio-export,name = "cc2541-boot";
+			gpio-export,output = <0>;
+			gpios = <&gpio 26 GPIO_ACTIVE_LOW>;
+		};
+
+		cc2541-reset {
+			gpio-export,name = "cc2541-reset";
+			gpio-export,output = <0>;
+			gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
+		};
+
+		cc2541-clk {
+			gpio-export,name = "cc2541-clk";
+			gpio-export,output = <0>;
+			gpios = <&gpio 28 GPIO_ACTIVE_HIGH>;
+		};
+
+		cc2541-data {
+			gpio-export,name = "cc2541-data";
+			gpio-export,direction_may_change;
+			gpios = <&gpio 29 GPIO_ACTIVE_HIGH>;
+		};
+
+		/*
+		   When "OPEN THE DOOR" button is pressed
+		   GPIO will be activated via the KEY signal cable
+		*/
+		key {
+			gpio-export,name = "key";
+			gpios = <&gpio 37 GPIO_ACTIVE_HIGH>;
+		};
+
+		// Activate GPIO to control the relay to open the door
+		relay {
+			gpio-export,name = "relay";
+			gpio-export,output = <0>;
+			gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	matrix-keypad {
+		compatible = "gpio-matrix-keypad";
+		debounce-delay-ms = <10>;
+		col-scan-delay-us = <10>;
+		gpio-activelow;
+		wakeup-source;
+
+		row-gpios = <&gpio 20 GPIO_ACTIVE_LOW
+			     &gpio 21 GPIO_ACTIVE_LOW
+			     &gpio 19 GPIO_ACTIVE_LOW>;
+
+		col-gpios = <&gpio 24 GPIO_ACTIVE_LOW
+			     &gpio 25 GPIO_ACTIVE_LOW
+			     &gpio 22 GPIO_ACTIVE_LOW
+			     &gpio 23 GPIO_ACTIVE_LOW>;
+
+		linux,keymap = <MATRIX_KEY(0, 0, KEY_1)
+				MATRIX_KEY(1, 0, KEY_2)
+				MATRIX_KEY(2, 0, KEY_3)
+				MATRIX_KEY(0, 1, KEY_4)
+				MATRIX_KEY(1, 1, KEY_5)
+				MATRIX_KEY(2, 1, KEY_6)
+				MATRIX_KEY(0, 2, KEY_7)
+				MATRIX_KEY(1, 2, KEY_8)
+				MATRIX_KEY(2, 2, KEY_9)
+				MATRIX_KEY(0, 3, KEY_BACK)
+				MATRIX_KEY(1, 3, KEY_0)
+				MATRIX_KEY(2, 3, KEY_ENTER)>;
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2s", "gpio", "spis", "pwm1", "uart2", "sdmode", "refclk", "p1led_an", "p0led_an", "wled_an";
+		function = "gpio";
+	};
+};
+
+&spi0 {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0x30000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x30000 0x10000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "factory";
+				reg = <0x40000 0x10000>;
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					eeprom_factory_0: eeprom@0 {
+						reg = <0x0 0x400>;
+					};
+
+					macaddr_factory_4: macaddr@4 {
+						compatible = "mac-base";
+						reg = <0x4 0x6>;
+					};
+				};
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x50000 0x7b0000>;
+			};
+		};
+	};
+};
+
+&ethernet {
+	nvmem-cells = <&macaddr_factory_4 (-1)>;
+	nvmem-cell-names = "mac-address";
+};
+
+&esw {
+	mediatek,portmap = <0x3f>;
+	mediatek,portdisable = <0x3e>;
+};
+
+&wmac {
+	status = "okay";
+
+	nvmem-cells = <&eeprom_factory_0>;
+	nvmem-cell-names = "eeprom";
+};
+
+&i2c {
+	status = "okay";
+
+	rfid@28 {
+		compatible = "mfrc522";
+		reg = <0x28>;
+	};
+
+	rtc@68 {
+		compatible = "dallas,ds1339";
+		reg = <0x68>;
+	};
+};
+
+&uart1 {
+	status = "okay";
+};
diff --git a/target/linux/ramips/image/mt76x8.mk b/target/linux/ramips/image/mt76x8.mk
index 314f8e1e9f..5930d62a0b 100644
--- a/target/linux/ramips/image/mt76x8.mk
+++ b/target/linux/ramips/image/mt76x8.mk
@@ -533,6 +533,14 @@ define Device/oraybox_x1
 endef
 TARGET_DEVICES += oraybox_x1
 
+define Device/qding_qc202
+  IMAGE_SIZE := 7872k
+  DEVICE_VENDOR := Qding
+  DEVICE_MODEL := QC202
+  DEVICE_PACKAGES := kmod-i2c-mt7628 kmod-gpio-beeper kmod-input-matrix-keypad kmod-input-evdev uboot-envtools
+endef
+TARGET_DEVICES += qding_qc202
+
 define Device/rakwireless_rak633
   IMAGE_SIZE := 7872k
   DEVICE_VENDOR := Rakwireless
diff --git a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
index a7adc2d712..31cb38091b 100644
--- a/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt76x8/base-files/etc/board.d/02_network
@@ -21,6 +21,7 @@ ramips_setup_interfaces()
 	minew,g1-c|\
 	onion,omega2p|\
 	onion,omega2|\
+	qding,qc202|\
 	ravpower,rp-wd009|\
 	tama,w06|\
 	tplink,re200-v2|\