ath79: add support for COMFAST CF-E375AC

COMFAST CF-E375AC is a ceiling mount AP with PoE support,
based on Qualcomm/Atheros QCA9563 + QCA9886 + QCA8337.

Short specification:

    2x 10/100/1000 Mbps Ethernet, with PoE support
    128MB of RAM (DDR2)
    16 MB of FLASH
    3T3R 2.4 GHz, 802.11b/g/n
    2T2R 5 GHz, 802.11ac/n/a, wave 2
    built-in 5x 3 dBi antennas
    output power (max): 500 mW (27 dBm)
    1x RGB LED, 1x button
    built-in watchdog chipset

Flash instruction:
1) Original firmware is based on OpenWrt.
Use sysupgrade image directly in vendor GUI.

2) TFTP
2.1) Set a tftp server on your machine with a fixed IP address of
     192.168.1.10. A place the sysupgrade as firmware_auto.bin.
2.2) boot the device with an ethernet connection on fixed ip route
2.3) wait a few seconds and try to login via ssh

3) TFTP trough Bootloader
3.1) open the device case and get a uart connection working
3.2) stop the autoboot process and test connection with serverip
3.3) name the sysupgrade image firmware.bin and run firmware_upg

MAC addresses:
Though the OEM firmware has four adresses in the usual locations,
it appears that the assigned addresses are just incremented in a
different way:

interface    address    location
LAN:          *:DC      0x0
WAN           *:DD      0x1002
WLAN 2.4g     *:E6      n/a (0x0 + 10)
WLAN 5g       *:DE      0x6
unused        *:DF      0x5006

The MAC address pointed at the label is the one assign to the LAN
interface.

Signed-off-by: Joao Henrique Albuquerque <joaohccalbu@gmail.com>
[add label-mac-device, remove redundant uart status, fix whitespace
issues, fix commit message wrapping, remove x bit on DTS file]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9563_comfast_cf-e375ac.dts b/target/linux/ath79/dts/qca9563_comfast_cf-e375ac.dts
new file mode 100644
index 0000000000..1eeb02f7f9
--- /dev/null
+++ b/target/linux/ath79/dts/qca9563_comfast_cf-e375ac.dts
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "qca956x.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "COMFAST CF-E375AC";
+	compatible = "comfast,cf-e375ac", "qca,qca9563";
+
+	aliases {
+		label-mac-device = &eth0;
+		led-boot = &led_lan;
+		led-failsafe = &led_lan;
+		led-running = &led_lan;
+		led-upgrade = &led_lan;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_lan: lan {
+			label = "green:lan";
+			gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
+		};
+
+		wan {
+			label = "red:wan";
+			gpios = <&gpio 15 GPIO_ACTIVE_HIGH>;
+		};
+
+		wlan2g {
+			label = "blue:wlan2g";
+			gpios = <&gpio 16 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "phy1tpt";
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+
+	watchdog {
+		compatible = "linux,wdt-gpio";
+
+		gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+		hw_algo = "toggle";
+		hw_margin_ms = <500>;
+		always-running;
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&spi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <25000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			art: partition@40000 {
+				label = "art";
+				reg = <0x040000 0x010000>;
+				read-only;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xfa0000>;
+			};
+
+			partition@ff0000 {
+				label = "art-backup";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0>;
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+		phy-mode = "sgmii";
+		qca,mib-poll-interval = <500>;
+
+		qca,ar8327-initvals = <
+			0x04 0x00080080 /* PORT0 PAD MODE CTRL */
+			0x7c 0x0000007e /* PORT0_STATUS */
+		>;
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0x03000101 0x00000101 0x00001919>;
+
+	phy-mode = "sgmii";
+	mtd-mac-address = <&art 0x0>;
+	phy-handle = <&phy0>;
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+	mtd-mac-address = <&art 0x0>;
+	mtd-mac-address-increment = <10>;
+};