ath79: Add support for OpenMesh OM2P-LC

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

* Qualcomm/Atheros AR9330 rev 1
* 400/400/200 MHz (CPU/DDR/AHB)
* 64 MB of RAM
* 16 MB of SPI NOR flash
  - 2x 7 MB available; but one of the 7 MB regions is the recovery image
* 2x 10/100 Mbps Ethernet
* 1T1R 2.4 GHz Wi-Fi
* 6x GPIO-LEDs (3x wifi, 2x ethernet, 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)
* 2x fast ethernet
  - eth0
    + builtin switch port 1
    + used as LAN interface
  - eth1
    + 18-24V passive POE (mode B)
    + used as WAN 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>

5 files changed, 170 insertions, 1 deletions

diff --git a/target/linux/ath79/dts/ar9330_openmesh_om2p-lc.dts b/target/linux/ath79/dts/ar9330_openmesh_om2p-lc.dts
new file mode 100644
index 0000000000..7383df50ab
--- /dev/null
+++ b/target/linux/ath79/dts/ar9330_openmesh_om2p-lc.dts
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9330_openmesh_om2p.dtsi"
+
+/ {
+	compatible = "openmesh,om2p-lc", "qca,ar9330";
+	model = "OpenMesh OM2P-LC";
+};
diff --git a/target/linux/ath79/dts/ar9330_openmesh_om2p.dtsi b/target/linux/ath79/dts/ar9330_openmesh_om2p.dtsi
new file mode 100644
index 0000000000..d9ca2c0f72
--- /dev/null
+++ b/target/linux/ath79/dts/ar9330_openmesh_om2p.dtsi
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9330.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 = &eth1;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&switch_led_disable_pins>;
+
+		wifi_yellow {
+			label = "yellow:wifi";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+		};
+
+		led_power_blue: power_blue {
+			label = "blue:power";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		lan_blue {
+			label = "blue:lan";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		wifi_green {
+			label = "green:wifi";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		wifi_red {
+			label = "red:wifi";
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+
+		wan_blue {
+			label = "blue:wan";
+			gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+		gpios = <&gpio 26 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 = <25000000>;
+
+		/* 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 0x040000>;
+			};
+
+			partition@80000 {
+				label = "custom";
+				reg = <0x080000 0x140000>;
+				read-only;
+			};
+
+			partition@1c0000 {
+				label = "inactive";
+				reg = <0x1c0000 0x700000>;
+			};
+
+			partition@8c0000 {
+				label = "inactive2";
+				reg = <0x8c0000 0x700000>;
+			};
+
+			art: partition@fc0000 {
+				label = "ART";
+				reg = <0xfc0000 0x040000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x6>;
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x0>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};
diff --git a/target/linux/ath79/generic/base-files/etc/board.d/01_leds b/target/linux/ath79/generic/base-files/etc/board.d/01_leds
index 3889969ee5..b651432dca 100755
--- a/target/linux/ath79/generic/base-files/etc/board.d/01_leds
+++ b/target/linux/ath79/generic/base-files/etc/board.d/01_leds
@@ -148,6 +148,7 @@ comfast,cf-ew72|\
 openmesh,om2p-hs-v1|\
 openmesh,om2p-hs-v2|\
 openmesh,om2p-hs-v3|\
+openmesh,om2p-lc|\
 telco,t1)
 	ucidef_set_led_switch "lan" "LAN" "blue:lan" "switch0" "0x02"
 	ucidef_set_led_netdev "wan" "WAN" "blue:wan" "eth1"
diff --git a/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh b/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
index 9ff36f1bf5..ea3d9d6d84 100644
--- a/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ath79/generic/base-files/lib/upgrade/platform.sh
@@ -54,7 +54,8 @@ platform_do_upgrade() {
 	openmesh,om2p-hs-v1|\
 	openmesh,om2p-hs-v2|\
 	openmesh,om2p-hs-v3|\
-	openmesh,om2p-hs-v4)
+	openmesh,om2p-hs-v4|\
+	openmesh,om2p-lc)
 		PART_NAME="inactive"
 		platform_do_upgrade_openmesh "$1"
 		;;
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 631cc2fd6a..6f21db78d2 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -1613,6 +1613,14 @@ define Device/openmesh_om2p-hs-v4
 endef
 TARGET_DEVICES += openmesh_om2p-hs-v4
 
+define Device/openmesh_om2p-lc
+  $(Device/openmesh_om2p-common)
+  SOC := ar9330
+  DEVICE_MODEL := OM2P-LC
+  SUPPORTED_DEVICES += om2p-lc
+endef
+TARGET_DEVICES += openmesh_om2p-lc
+
 define Device/openmesh_om5p-ac-v2
   SOC := qca9558
   DEVICE_VENDOR := OpenMesh