ath79: add support for Qxwlan E558 v2

Qxwlan E558 v2 is based on Qualcomm QCA9558 + AR8327.

Specification:

 - 720/600/200 MHz (CPU/DDR/AHB)
 - 128 MB of RAM (DDR2)
 - 8/16 MB of FLASH (SPI NOR)
 - 2T2R 2.4 GHz (QCA9558)
 - 3x 10/100/1000 Mbps Ethernet (one port with PoE support)
 - 4x miniPCIe slot (USB 2.0 bus only)
 - 1x microSIM slot
 - 5x LED (4 driven by GPIO)
 - 1x button (reset)
 - 1x 3-pos switch
 - 1x DC jack for main power input (9-48 V)
 - UART (JP5) and LEDs (J8) headers on PCB

Flash instruction:

   1.Using tftp mode with UART connection and original LEDE image
      - Configure PC with static IP 192.168.1.10 and tftp server.
      - Rename "openwrt-ar71xx-generic-xxx-squashfs-sysupgrade.bin"
        to "firmware.bin" and place it in tftp server directory.
      - Connect PC with one of LAN ports, power up the router and press
        key "Enter" to access U-Boot CLI.
      - Use the following commands to update the device to LEDE:
        run lfw
      - After that the device will reboot and boot to LEDE.
      - Wait until all LEDs stops flashing and use the router.

   2.Using httpd mode with Web UI connection and original LEDE image
      - Configure PC with static IP 192.168.1.xxx(2-255) and tftp server.
      - Connect PC with one of LAN ports,press the reset button, power up
        the router and keep button pressed for around 6-7 seconds, until
        leds flashing.
      - Open your browser and enter 192.168.1.1,You will see the upgrade
        interface, select "openwrt-ar71xx-generic-xxx-squashfs-
        sysupgrade.bin" and click the upgrade button.
      - After that the device will reboot and boot to LEDE.
      - Wait until all LEDs stops flashing and use the router.

Signed-off-by: 张鹏 <sd20@qxwlan.com>
[cut out of bigger patch, keep swconfig, whitespace adjustments]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

3 files changed, 204 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-16m.dts b/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-16m.dts
new file mode 100644
index 0000000000..1df4c5e6b5
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-16m.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca9558_qxwlan_e558.dtsi"
+
+/ {
+	model = "Qxwlan E558 v2 16M";
+	compatible = "qxwlan,e558-v2-16m", "qca,qca9558";
+};
+
+&partitions {
+	partition@70000 {
+		compatible = "denx,uimage";
+		label = "firmware";
+		reg = <0x070000 0xf90000>;
+	};
+};
diff --git a/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-8m.dts b/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-8m.dts
new file mode 100644
index 0000000000..30d17d5b05
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_qxwlan_e558-v2-8m.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca9558_qxwlan_e558.dtsi"
+
+/ {
+	model = "Qxwlan E558 v2 8M";
+	compatible = "qxwlan,e558-v2-8m", "qca,qca9558";
+};
+
+&partitions {
+	partition@70000 {
+		compatible = "denx,uimage";
+		label = "firmware";
+		reg = <0x070000 0x790000>;
+	};
+};
diff --git a/target/linux/ath79/dts/qca9558_qxwlan_e558.dtsi b/target/linux/ath79/dts/qca9558_qxwlan_e558.dtsi
new file mode 100644
index 0000000000..99f37ac025
--- /dev/null
+++ b/target/linux/ath79/dts/qca9558_qxwlan_e558.dtsi
@@ -0,0 +1,172 @@
+// 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>
+
+/ {
+	aliases {
+		led-boot = &led_system;
+		led-failsafe = &led_system;
+		led-running = &led_system;
+		led-upgrade = &led_system;
+		label-mac-device = &eth0;
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "Reset button";
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		wlan {
+			label = "green:wlan";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "phy0tpt";
+		};
+
+		led_system: system {
+			label = "green:system";
+			gpios = <&gpio 14 GPIO_ACTIVE_LOW>;
+			default-state = "on";
+		};
+
+		sig1 {
+			label = "green:sig1";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		sig2 {
+			label = "green:sig2";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pcie0 {
+	status = "okay";
+};
+
+&pcie1 {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+	num-cs = <1>;
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions: 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>;
+				read-only;
+			};
+
+			pridata: partition@50000 {
+				label = "pri-data";
+				reg = <0x050000 0x010000>;
+				read-only;
+			};
+
+			art: partition@60000 {
+				label = "art";
+				reg = <0x060000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+
+		qca,ar8327-initvals = <
+			0x04 0x00080080 /* PORT0 PAD MODE CTRL */
+			0x0c 0x07600000 /* PORT6 PAD MODE CTRL */
+			0x10 0x81000080 /* POWER_ON_STRAP */
+			0x50 0xcc35cc35 /* LED_CTRL0 */
+			0x54 0xca35ca35 /* LED_CTRL1 */
+			0x58 0xc935c935 /* LED_CTRL2 */
+			0x5c 0x03ffff00 /* LED_CTRL3 */
+			0x7c 0x0000007e /* PORT0_STATUS */
+			0x94 0x0000007e /* PORT6 STATUS */
+		>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0x56000000 0x00000101 0x00001616>;
+
+	phy-handle = <&phy0>;
+
+	mtd-mac-address = <&pridata 0x400>;
+	mtd-mac-address-increment = <1>;
+};
+
+&eth1 {
+	status = "okay";
+
+	pll-data = <0x03000101 0x00000101 0x00001616>;
+
+	mtd-mac-address = <&pridata 0x400>;
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&usb_phy0 {
+	status = "okay";
+};
+
+&usb0 {
+	status = "okay";
+};
+
+&usb_phy1 {
+	status = "okay";
+};
+
+&usb1 {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};