ath79: add support for ALFA Network AP121FE

The AP121FE is a slightly modified version of already supported AP121F
model (added to ar71xx in 0c6165d21a and to ath79 in 334bbc5198).

The differences in compare to AP121F:

- no micro SD card reader
- USB data lines are included in Type-A plug
- USB bus switched to device/peripheral mode (permanently, in bootstrap)

Other than that, specifications are the same:

- Atheros AR9331
- 400/400/200 MHz (CPU/DDR/AHB)
- 64 MB of RAM (DDR1)
- 16 MB of flash (SPI NOR)
- 1x 10/100 Mbps Ethernet
- 1T1R 2.4 GHz Wi-Fi, up to 15 dBm
- 1x IPEX/U.FL connector, internal PCB antenna
- 3x LED, 1x button, 1x switch
- 4-pin UART header on PCB (2 mm pitch)
- USB 2.0 Type-A plug (power and data)

Flash instruction (under U-Boot web recovery mode):

1. Configure PC with static IP 192.168.1.2/24.
2. Connect PC with RJ45 port, press the reset button, power up device,
   wait for first blink of all LEDs (indicates network setup), then keep
   button for 3 following blinks and release it.
3. Open 192.168.1.1 address in your browser and upload sysupgrade image.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9331_alfa-network_ap121f.dtsi b/target/linux/ath79/dts/ar9331_alfa-network_ap121f.dtsi
new file mode 100644
index 0000000000..74d65d828a
--- /dev/null
+++ b/target/linux/ath79/dts/ar9331_alfa-network_ap121f.dtsi
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9331.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	aliases {
+		label-mac-device = &wmac;
+		led-boot = &led_vpn;
+		led-failsafe = &led_vpn;
+		led-upgrade = &led_vpn;
+		serial0 = &uart;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+
+		switch {
+			label = "switch";
+			linux,code = <BTN_0>;
+			gpios = <&gpio 21 GPIO_ACTIVE_HIGH>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&art 0x0>;
+
+	gmac-config {
+		device = <&gmac>;
+		switch-phy-addr-swap = <0>;
+		switch-phy-swap = <0>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+
+	compatible = "syscon", "simple-mfd";
+};
+
+&spi {
+	status = "okay";
+
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+		m25p,fast-read;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x030000>;
+				read-only;
+			};
+
+			partition@30000 {
+				label = "u-boot-env";
+				reg = <0x030000 0x010000>;
+			};
+
+			art: partition@40000 {
+				label = "art";
+				reg = <0x040000 0x010000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xfb0000>;
+			};
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&usb {
+	status = "okay";
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};