ath79: add support for YunCore XD4200 and A782

YunCore XD4200 ('XD4200_W6.0' marking on PCB) is Qualcomm/Atheros based
(QCA9563, QCA9886, QCA8334) dual-band, Wave-2 AC1200 ceiling AP with PoE
(802.3at) support. A782 model ('T750_V5.1' marking on PCB) is a smaller
version of the XD4200, with similar specification but lower TX power.

Specification:

- QCA9563 (775 MHz)
- 128 MB of RAM (DDR2)
- 16 MB of FLASH (SPI NOR)
- 2x 10/100/1000 Mbps Ethernet (QCA8334), with 802.3at PoE support (WAN)
- Wi-Fi 2.4 GHz:
  - XD4200: 2T2R (QCA9563), with ext. PA (SKY65174-21) and LNA
  - A782: 2T2R (QCA9563), with ext. FEM (SKY85329-11)
- Wi-Fi 5 GHz:
  - XD4200: 2T2R (QCA9886), with ext. FEM (SKY85728-11)
  - A782: 2T2R (QCA9886), with ext. FEM (SKY85735-11)
- LEDs:
  - XD4200: 5x (2x driven by SOC, 1x driven by AC radio, 2x Ethernet)
  - A782: 3x (1x RGB, driven by SOC and radio, 2x Ethernet)
- 1x button (reset)
- 1x UART (4-pin, 2.54 mm pitch) header on PCB
- 1x DC jack (12 V)

Flash instructions:

If your device comes with generic QSDK based firmware, you can login
over telnet (login: root, empty password, default IP: 192.168.188.253),
issue first (important!) 'fw_setenv' command and then perform regular
upgrade, using 'sysupgrade -n -F ...' (you can use 'wget' to download
image to the device, SSH server is not available):

  fw_setenv bootcmd "bootm 0x9f050000 || bootm 0x9fe80000"
  sysupgrade -n -F openwrt-...-yuncore_...-squashfs-sysupgrade.bin

In case your device runs firmware with YunCore custom GUI, you can use
U-Boot recovery mode:

1. Set a static IP 192.168.0.141/24 on PC and start TFTP server with
   'tftp' image renamed to 'upgrade.bin'
2. Power the device with reset button pressed and release it after 5-7
   seconds, recovery mode should start downloading image from server
   (unfortunately, there is no visible indication that recovery got
   enabled - in case of problems check TFTP server logs)

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

1 files changed, 122 insertions, 0 deletions

diff --git a/target/linux/ath79/dts/qca9563_yuncore_xd4200.dtsi b/target/linux/ath79/dts/qca9563_yuncore_xd4200.dtsi
new file mode 100644
index 0000000000..2f7964de90
--- /dev/null
+++ b/target/linux/ath79/dts/qca9563_yuncore_xd4200.dtsi
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+#include "qca956x.dtsi"
+
+/ {
+	aliases {
+		label-mac-device = &eth0;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			linux,code = <KEY_RESTART>;
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&eth0 {
+	status = "okay";
+
+	pll-data = <0x03000101 0x00000101 0x00001919>;
+
+	mtd-mac-address = <&art 0x0>;
+	phy-mode = "sgmii";
+	phy-handle = <&phy0>;
+};
+
+&gpio {
+	status = "okay";
+};
+
+&mdio0 {
+	status = "okay";
+
+	phy-mask = <0>;
+
+	phy0: ethernet-phy@0 {
+		reg = <0>;
+		phy-mode = "sgmii";
+
+		qca,ar8327-initvals = <
+			0x04 0x00080080 /* PORT0 PAD MODE CTRL */
+			0x10 0x81000080 /* POWER_ON_STRIP */
+			0x50 0xcf37cf37 /* LED_CTRL0 */
+			0x54 0xcf37cf37 /* LED_CTRL1 */
+			0x58 0xcf37cf37 /* LED_CTRL2 */
+			0x5c 0x0000c300 /* LED_CTRL3 */
+			0x7c 0x0000007e /* PORT0_STATUS */
+		>;
+	};
+};
+
+&pcie {
+	status = "okay";
+
+	wifi@0,0 {
+		compatible = "pci168c,0056";
+		reg = <0x0000 0 0 0 0>;
+	};
+};
+
+&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>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x000000 0x040000>;
+				read-only;
+			};
+
+			partition@40000 {
+				label = "u-boot-env";
+				reg = <0x040000 0x010000>;
+			};
+
+			partition@50000 {
+				compatible = "denx,uimage";
+				label = "firmware";
+				reg = <0x050000 0xfa0000>;
+			};
+
+			art: partition@ff0000 {
+				label = "art";
+				reg = <0xff0000 0x010000>;
+				read-only;
+			};
+		};
+	};
+};
+
+&uart {
+	status = "okay";
+};
+
+&wmac {
+	status = "okay";
+
+	mtd-cal-data = <&art 0x1000>;
+};