ath79: add support for TP-Link TL-WR710N v2.1

This adds support for the TP-Link TL-WR710N v2.1. It is basically a
re-issue of the v1.2.

Specifications:

SoC:       Atheros AR9331
CPU:       400 MHz
Flash:     8 MiB
RAM:       32 MiB
WiFi:      2.4 GHz b/g/n
Ethernet:  2x 100M ports
USB:       1x 2.0

The only difference from the v1 is the TP-Link hardware ID/revision.

Attention:
The TL-WR710N v2.0 (!) has only 4 MB flash and cannot be flashed with
this image. It has a different TPLINK_HWREV, so accidental flashing
of the factory image should be impossible without additional measures.

Unfortunately, the v2.0 in ar71xx has the same board name, so sysupgrade
from ar71xx v2.0 into ath79 v1/v2.1 will not be prevented, but will brick
the device.

Flashing instruction:

Upload the factory image via the OEM firmware GUI upgrade mechanism.

Further notes:

To make implementation easier if somebody desires to port the 4M v2.0,
this already creates two DTSI files.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Tested-by: Fabian Eppig <fabian@eppig.de>
(backported from eb531337a779a48a2d17bc66f0d222325d6c1563)

1 files changed, 92 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/ar9331_tplink_tl-wr710n.dtsi b/target/linux/ath79/dts/ar9331_tplink_tl-wr710n.dtsi
new file mode 100644
index 0000000000..6ec44c2cdc
--- /dev/null
+++ b/target/linux/ath79/dts/ar9331_tplink_tl-wr710n.dtsi
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "ar9331.dtsi"
+
+/ {
+	aliases {
+		serial0 = &uart;
+		led-boot = &led_system;
+		led-failsafe = &led_system;
+		led-running = &led_system;
+		led-upgrade = &led_system;
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_system: system {
+			label = "tl-wr710n:green:system";
+			gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	reg_usb_vbus: regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "usb_vbus";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		gpio = <&gpio 8 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	mtd-mac-address = <&uboot 0x1fc00>;
+
+	gmac-config {
+		device = <&gmac>;
+
+		switch-phy-addr-swap = <0>;
+		switch-phy-swap = <0>;
+	};
+};
+
+&eth1 {
+	status = "okay";
+
+	mtd-mac-address = <&uboot 0x1fc00>;
+	mtd-mac-address-increment = <(-1)>;
+};
+
+&gpio {
+	status = "okay";
+};
+
+&uart {
+	status = "okay";
+};
+
+&usb {
+	status = "okay";
+
+	dr_mode = "host";
+	vbus-supply = <&reg_usb_vbus>;
+};
+
+&usb_phy {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&uboot 0x1fc00>;
+};