ath79: Add support for OpenMesh MR600 v2

Device specifications:
======================

* Qualcomm/Atheros AR9344 rev 2
* 560/450/225 MHz (CPU/DDR/AHB)
* 128 MB of RAM
* 16 MB of SPI NOR flash
  - 2x 7 MB available; but one of the 7 MB regions is the recovery image
* 2T2R 2.4 GHz Wi-Fi
* 2T2R 5 GHz Wi-Fi
* 8x GPIO-LEDs (6x wifi, 1x wps, 1x power)
* 1x GPIO-button (reset)
* external h/w watchdog (enabled by default))
* TTL pins are on board (arrow points to VCC, then follows: GND, TX, RX)
* 1x ethernet
  - AR8035 ethernet PHY (RGMII)
  - 10/100/1000 Mbps Ethernet
  - 802.3af POE
  - used as LAN interface
* 12-24V 1A DC
* internal antennas

Flashing instructions:
======================

Various methods can be used to install the actual image on the flash.
Two easy ones are:

ap51-flash
----------

The tool ap51-flash (https://github.com/ap51-flash/ap51-flash) should be
used to transfer the image to the u-boot when the device boots up.

initramfs from TFTP
-------------------

The serial console must be used to access the u-boot shell during bootup.
It can then be used to first boot up the initramfs image from a TFTP server
(here with the IP 192.168.1.21):

   setenv serverip 192.168.1.21
   setenv ipaddr 192.168.1.1
   tftpboot 0c00000 <filename-of-initramfs-kernel>.bin && bootm $fileaddr

The actual sysupgrade image can then be transferred (on the LAN port) to the
device via

  scp <filename-of-squashfs-sysupgrade>.bin root@192.168.1.1:/tmp/

On the device, the sysupgrade must then be started using

  sysupgrade -n /tmp/<filename-of-squashfs-sysupgrade>.bin

Signed-off-by: Sven Eckelmann <sven@narfation.org>
[rebase, add LED migration]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 71 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9344_openmesh_mr600-v2.dts b/target/linux/ath79/dts/ar9344_openmesh_mr600-v2.dts
new file mode 100644
index 0000000000..988066798f
--- /dev/null
+++ b/target/linux/ath79/dts/ar9344_openmesh_mr600-v2.dts
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9344_openmesh_mr600.dtsi"
+
+/ {
+	compatible = "openmesh,mr600-v2", "qca,ar9344";
+	model = "OpenMesh MR600 v2";
+
+	aliases {
+		led-boot = &led_power_blue;
+		led-failsafe = &led_power_blue;
+		led-running = &led_power_blue;
+		led-upgrade = &led_power_blue;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wifi5g_red {
+			label = "red:wifi5g";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		wps_blue {
+			label = "blue:wps";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_blue: power_blue {
+			label = "blue:power";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wifi2g_green {
+			label = "green:wifi2g";
+			gpios = <&gpio 18 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+
+		wifi2g_yellow {
+			label = "yellow:wifi2g";
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi2g_red {
+			label = "red:wifi2g";
+			gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi5g_green {
+			label = "green:wifi5g";
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		wifi5g_yellow {
+			label = "yellow:wifi5g";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+		gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		hw_algo = "toggle";
+		/* hw_margin_ms is actually 300s but driver limits it to 60s */
+		hw_margin_ms = <60000>;
+		always-running;
+	};
+};