ramips: add support for D-Link DIR-853 A3

Specifications:
* SoC: MT7621AT
* RAM: 256MB
* Flash: 128MB NAND flash
* WiFi: MT7615DN (2.4GHz+5Ghz) with DBDC
* LAN: 5x1000M
* Firmware layout is Uboot with extra 96 bytes in header
* Base PCB is DIR-1360 REV1.0
* LEDs Power Blue+Orange,Wan Blue+Orange,WPS Blue,"2.4G"Blue, "5G" Blue,
  USB Blue
* Buttons Reset,WPS, Wifi

MAC addresses on OEM firmware:

lan      factory 0xe000   f4:*:*:a8:*:65  (label)
wan      factory 0xe006   f4:*:*:a8:*:68
2.4 GHz  [not on flash]   f6:*:*:c8:*:66
5.0 GHz  factory 0x4      f4:*:*:a8:*:66

The increment of the 4th byte for the 2.4g address appears to vary.
Reported cases:

       5g                 2.4g         increment
 f4:XX:XX:a8:XX:66  f6:XX:XX:c8:XX:66  +0x20
 x0:xx:xx:68:xx:xx  x2:xx:xx:48:xx:xx  -0x20
 x4:xx:xx:6a:xx:xx  x6:xx:xx:4a:xx:xx  -0x20

Since increment is inconsistent and there is no obvious pattern
in swapping bytes, and the 2.4g address has local bit set anyway,
it seems safer to use the LAN address with flipped byte here in
order to prevent collisions between OpenWrt devices and OEM devices
for this interface. This way we at least use an address as base
that is definitely owned by the device at hand.

Flashing instruction:

The Dlink "Emergency Room" cannot be accessed through the reset
button on this device. You can either use console or use the
encrypted factory image availble in the openwrt forum.

Once the encrypted image is flashed throuh the stock Dlink web
interface, the sysupgrade images can be used.

Header pins needs to be soldered near the WPS and Wifi buttons.

The layout for the pins is (VCC,RX,TX,GND). No need to connect the VCC.

the settings are:

Bps/Par/Bits          : 57600 8N1
Hardware Flow Control : No
Software Flow Control : No

Connect your client computer to LAN1 of the device
Set your client IP address manually to 192.168.0.101 / 255.255.255.0.
Call the recovery page or tftp for the device at http://192.168.0.1
Use the provided emergency web GUI to upload and flash a new firmware to
the device

At the time of adding support the wireless config needs to be set up by
editing the wireless config file:

 * Setting the country code is mandatory, otherwise the router loses
   connectivity at the next reboot. This is mandatory and can be done
   from luci. After setting the country code the router boots correctly.
   A reset with the reset button will fix the issue and the user has to
   reconfigure.

 * This is minor since the 5g interface does not come up online although
   it is not set as disabled. 2 options here:

   1- Either run the "wifi" command. Can be added from LUCI in system -
      startup - local startup and just add wifi above "exit 0".

   2- Or add the serialize option in the wireless config file as shown
      below. This one would work and bring both interfaces automatically
      at every boot:

      config wifi-device 'radio0'
          option serialize '1'

      config wifi-device 'radio1'
          option serialize '1'

Signed-off-by: Karim Dehouche <karimdplay@gmail.com>
[rebase, improve MAC table, update wireless config comment, fix
 2.4g macaddr setup]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 204 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/mt7621_dlink_dir-853-a3.dts b/target/linux/ramips/dts/mt7621_dlink_dir-853-a3.dts
new file mode 100644
index 0000000000..738bcdc7d6
--- /dev/null
+++ b/target/linux/ramips/dts/mt7621_dlink_dir-853-a3.dts
@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "dlink,dir-853-a3", "mediatek,mt7621-soc";
+	model = "D-Link DIR-853 A3";
+
+	aliases {
+		label-mac-device = &gmac0;
+		led-boot = &led_power_orange;
+		led-failsafe = &led_power_blue;
+		led-running = &led_power_blue;
+		led-upgrade = &led_net_orange;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WPS_BUTTON>;
+		};
+
+		wifi {
+			label = "wifi";
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RFKILL>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_power_orange: power_orange {
+			label = "orange:power";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_blue: power_blue {
+			label = "blue:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+		};
+
+		led_net_orange: net_orange {
+			label = "orange:net";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		net_blue {
+			label = "blue:net";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		usb_blue {
+			label = "blue:usb";
+			gpios = <&gpio 10 GPIO_ACTIVE_LOW>;
+			trigger-sources = <&xhci_ehci_port1>;
+			linux,default-trigger = "usbport";
+		};
+
+		wlan2g {
+			label = "blue:wlan2g";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0radio";
+		};
+
+		wlan5g {
+			label = "blue:wlan5g";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1radio";
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x80000>;
+			read-only;
+		};
+
+		partition@80000 {
+			label = "config";
+			reg = <0x80000 0x80000>;
+			read-only;
+		};
+
+		factory: partition@100000 {
+			label = "factory";
+			reg = <0x100000 0x40000>;
+			read-only;
+		};
+
+		partition@140000 {
+			label = "config2";
+			reg = <0x140000 0x40000>;
+			read-only;
+		};
+
+		partition@180000 {
+			label = "firmware";
+			compatible = "openwrt,uimage", "denx,uimage";
+			openwrt,padding = <96>;
+			reg = <0x180000 0x2800000>;
+		};
+
+		partition@2980000 {
+			label = "private";
+			reg = <0x2980000 0x2000000>;
+			read-only;
+		};
+
+		partition@4980000 {
+			label = "firmware2";
+			reg = <0x4980000 0x2800000>;
+		};
+
+		partition@7180000 {
+			label = "mydlink";
+			reg = <0x7180000 0x600000>;
+			read-only;
+		};
+
+		partition@7780000 {
+			label = "reserved";
+			reg = <0x7780000 0x880000>;
+			read-only;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0>;
+		/* 5 GHz (phy1) does not take the address from calibration data,
+		   but setting it manually here works */
+		mtd-mac-address = <&factory 0x4>;
+	};
+};
+
+&gmac0 {
+	mtd-mac-address = <&factory 0xe000>;
+};
+
+&switch0 {
+	ports {
+		port@0 {
+			status = "okay";
+			label = "lan4";
+		};
+
+		port@1 {
+			status = "okay";
+			label = "lan3";
+		};
+
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "wan";
+			mtd-mac-address = <&factory 0xe006>;
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "uart2", "uart3", "jtag", "wdt";
+		function = "gpio";
+	};
+};