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 eb531337a7)

target/linux/ath79/dts/ar9331_tplink_tl-wr710n-8m.dtsi

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "ar9331_tplink_tl-wr710n.dtsi"
+
+&spi {
+	status = "okay";
+
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			uboot: partition@0 {
+				reg = <0x0 0x20000>;
+				label = "u-boot";
+				read-only;
+			};
+
+			partition@20000 {
+				compatible = "tplink,firmware";
+				reg = <0x20000 0x7d0000>;
+				label = "firmware";
+			};
+
+			art: partition@7f0000 {
+				reg = <0x7f0000 0x10000>;
+				label = "art";
+				read-only;
+			};
+		};
+	};
+};

target/linux/ath79/dts/ar9331_tplink_tl-wr710n-v1.dts

@@ -1,126 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
 /dts-v1/;
 
-#include <dt-bindings/gpio/gpio.h>
+#include "ar9331_tplink_tl-wr710n-8m.dtsi"
-#include <dt-bindings/input/input.h>
-
-#include "ar9331.dtsi"
 
 / {
 	model = "TP-Link TL-WR710N v1";
 	compatible = "tplink,tl-wr710n-v1", "qca,ar9331";
-
-	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;
-	};
-
-};
-
-&spi {
-	status = "okay";
-	num-cs = <1>;
-
-	flash@0 {
-		compatible = "jedec,spi-nor";
-		reg = <0>;
-		spi-max-frequency = <25000000>;
-
-		partitions {
-			compatible = "fixed-partitions";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			uboot: partition@0 {
-				reg = <0x0 0x20000>;
-				label = "u-boot";
-				read-only;
-			};
-
-			firmware: partition@20000 {
-				compatible = "tplink,firmware";
-				reg = <0x20000 0x7d0000>;
-				label = "firmware";
-			};
-
-			art: partition@7f0000 {
-				reg = <0x7f0000 0x10000>;
-				label = "art";
-				read-only;
-			};
-		};
-	};
-};
-
-&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)>;
-};
-
-&uart {
-	status = "okay";
-};
-
-&usb {
-	dr_mode = "host";
-	vbus-supply = <&reg_usb_vbus>;
-	status = "okay";
-};
-
-&usb_phy {
-	status = "okay";
-};
-
-&wmac {
-	status = "okay";
-	mtd-cal-data = <&art 0x1000>;
-	mtd-mac-address = <&uboot 0x1fc00>;
 };

target/linux/ath79/dts/ar9331_tplink_tl-wr710n-v2.1.dts

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar9331_tplink_tl-wr710n-8m.dtsi"
+
+/ {
+	model = "TP-Link TL-WR710N v2.1";
+	compatible = "tplink,tl-wr710n-v2.1", "qca,ar9331";
+};

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>;
+};

target/linux/ath79/image/generic-tp-link.mk

@@ -322,6 +322,17 @@ define Device/tplink_tl-wr710n-v1
 endef
 TARGET_DEVICES += tplink_tl-wr710n-v1
 
+define Device/tplink_tl-wr710n-v2.1
+  $(Device/tplink-8mlzma)
+  ATH_SOC := ar9331
+  DEVICE_TITLE := TP-Link TL-WR710N v2.1
+  DEVICE_PACKAGES := kmod-usb-core kmod-usb-chipidea2 kmod-usb-ledtrig-usbport
+  TPLINK_HWID := 0x07100002
+  TPLINK_HWREV := 0x2
+  SUPPORTED_DEVICES += tl-wr710n
+endef
+TARGET_DEVICES += tplink_tl-wr710n-v2.1
+
 define Device/tplink_tl-wr842n-v1
   $(Device/tplink-8m)
   ATH_SOC := ar7241