ath79: Add support for OpenMesh MR900 v1

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

* Qualcomm/Atheros QCA9558 ver 1 rev 0
* 720/600/240 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
* 3T3R 2.4 GHz Wi-Fi
* 3T3R 5 GHz Wi-Fi
* 6x GPIO-LEDs (2x wifi, 2x status, 1x lan, 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>

2 files changed, 190 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9558_openmesh_mr900-v1.dts b/target/linux/ath79/dts/qca9558_openmesh_mr900-v1.dts
new file mode 100644
index 0000000000..96fc9853cb
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_openmesh_mr900-v1.dts
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca9558_openmesh_mr900.dtsi"
+
+/ {
+	compatible = "openmesh,mr900-v1", "qca,qca9558";
+	model = "OpenMesh MR900 v1";
+};
diff --git a/target/linux/ath79/dts/qca9558_openmesh_mr900.dtsi b/target/linux/ath79/dts/qca9558_openmesh_mr900.dtsi
new file mode 100644
index 0000000000..e506e12c31
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_openmesh_mr900.dtsi
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca955x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	chosen {
+		/delete-property/ bootargs;
+	};
+
+	aliases {
+		serial0 = &uart;
+		led-boot = &led_power_blue;
+		led-failsafe = &led_power_blue;
+		led-running = &led_power_blue;
+		led-upgrade = &led_power_blue;
+		label-mac-device = &eth0;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		lan_blue {
+			label = "blue:lan";
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi2g_blue {
+			label = "blue:wifi2g";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		status_green {
+			label = "green:status";
+			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
+		};
+
+		status_red {
+			label = "red:status";
+			gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_blue: power_blue {
+			label = "blue:power";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		wifi5g_blue {
+			label = "blue:wifi5g";
+			gpios = <&gpio 23 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy1tpt";
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+		gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		hw_algo = "toggle";
+		/* hw_margin_ms is actually 300s but driver limits it to 60s */
+		hw_margin_ms = <60000>;
+		always-running;
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+
+		/* partitions are passed via bootloader */
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			partition@50000 {
+				label = "custom";
+				reg = <0x050000 0x060000>;
+				read-only;
+			};
+
+			partition@b0000 {
+				label = "inactive";
+				reg = <0x0b0000 0x7a0000>;
+			};
+
+			partition@850000 {
+				label = "inactive2";
+				reg = <0x850000 0x7a0000>;
+			};
+
+			art: partition@ff0000 {
+				label = "ART";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0x20>;
+
+	phy5: ethernet-phy@5 {
+		reg = <5>;
+		eee-broken-100tx;
+		eee-broken-1000t;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0xae000000 0xa0000101 0xa0001313>;
+
+	mtd-mac-address = <&art 0x0>;
+
+	phy-mode = "rgmii-rxid";
+	phy-handle = <&phy5>;
+
+	gmac-config {
+		device = <&gmac>;
+		rgmii-enabled = <1>;
+		rxd-delay = <3>;
+		rxdv-delay = <3>;
+		txd-delay = <0>;
+		txen-delay = <0>;
+	};
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&art 0x0>;
+	mtd-mac-address-increment = <1>;
+};
+
+&pcie0 {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "pci168c,0033";
+		reg = <0x0000 0 0 0 0>;
+		mtd-mac-address = <&art 0x0>;
+		mtd-mac-address-increment = <16>;
+	};
+};