realtek: Add support for ZxXEL XGS1250-12 Switch

The ZyXEL XGS1250-12 Switch is a 11 + 1 port multi-GBit switch with
8 x 1000BaseT, 3 x 1000/2500/5000/10000BaseT Ethernet ports and
1 SFP+ module slot.

Hardware:
 - RTL9302B SoC
 - Macronix MX25L12833F (16MB flash)
 - Nanja NT5CC64M16GP-1 (128MB DDR3 SDRAM)
 - RTL8231 GPIO extender to control the port LEDs
 - RTL8218D 8x Gigabit PHY
 - Aquantia AQR113c 1/2.5/5/10 Gigabit PHYs
 - SFP+ 10GBit slot

Power is supplied via a 12V 2A standard barrel connector. At the
right side behind the grid is UART serial connector. A Serial
header can be connected to from the outside of the switch trough
the airvents with a standard 2.54mm header.
Pins are from top to bottom Vcc(3.3V), TX, RX and GND. Serial
connection is via 115200 baud, 8N1.

A reset button is accessble through a hole in the front panel

At the time of this commit, all ethernet ports work under OpenWRT,
including the various NBaseT modes, however the 10GBit SFP+ slot is not
supported.

Installation
--------------
* Connect serial as per the layout above. Connection parameters: 115200 8N1.
* Navigate to 'Management' in the OEM web interface and click on 'Firmware upgrade'
  to the left.
* Upload the OpenWrt initramfs image, and wait till the switch reboots.
* Connect to the device through serial and change the U-boot boot command.
  > fw_setenv bootcmd 'rtk network on; boota'
* Reboot, scp the sysupgrade image to /tmp, verify the checksum and flash it:
  > sysupgrade /tmp/openwrt-realtek-rtl930x-zyxel_xgs1250-12-squashfs-sysupgrade.bin
* Upon reboot, you have a functional OpenWrt installation. Leave the bootcmd
  value as is - without 'rtk network on' the switch will fail to initialise
  the network.

Web recovery
------------
The XGS1250-12 has a handy web recovery that will load when U-boot does
not find a bootable kernel. In case you would like to trigger the web
recovery manually, partially overwrite the firmware partition with some
zeroes:

  # dd if=/dev/zero of=/dev/mtd5 bs=1M count=2

If you have serial connected you'll see U-boot will start the web recovery
and print it's listening on 192.168.1.1, but by default it seems to be on
the OEM default IP for the switch - 192.168.1.3. The web recovery only
listens on HTTP (80) and *not* on 443 (HTTPS) unlike the web UI.

Return to stock
---------------
You can flash the ZyXEL firmware images to return to stock:

  # sysupgrade -F -n XGS1250-12_Firmware_V1.00(ABWE.1)C0.bix

Signed-off-by: Birger Koblitz <git@birger-koblitz.de>

1 files changed, 307 insertions, 0 deletions

diff --git a/target/linux/realtek/dts-5.10/rtl9302_zyxel_xgs1250-12.dts b/target/linux/realtek/dts-5.10/rtl9302_zyxel_xgs1250-12.dts
new file mode 100644
index 0000000000..28cace6c10
--- /dev/null
+++ b/target/linux/realtek/dts-5.10/rtl9302_zyxel_xgs1250-12.dts
@@ -0,0 +1,307 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/dts-v1/;
+
+#include "rtl930x.dtsi"
+
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	compatible = "zyxel,xgs1250-12", "realtek,rtl838x-soc";
+	model = "Zyxel XGS1250-12 Switch";
+
+	chosen {
+		bootargs = "console=ttyS0,115200";
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		mode {
+			label = "reset";
+			gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	/* i2c of the SFP cage: port 12 */
+	i2c0: i2c-rtl9300 {
+		compatible = "realtek,rtl9300-i2c";
+		reg = <0x1b00036c 0x3c>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		sda-pin = <10>;
+		scl-pin = <8>;
+		clock-frequency = <100000>;
+	};
+
+
+	sfp0: sfp-p12 {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c0>;
+		los-gpio = <&gpio0 17 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpio = <&gpio0 20 GPIO_ACTIVE_HIGH>;
+		mod-def0-gpio = <&gpio0 16 GPIO_ACTIVE_LOW>;
+		tx-disable-gpio = <&gpio0 15 GPIO_ACTIVE_HIGH>;
+	};
+
+	led_set: led_set@0 {
+		compatible = "realtek,rtl9300-leds";
+		led_set0 = <0x0000 0xffff 0x0a20 0x0b80>; // LED set 0: 1000Mbps,  10/100Mbps
+		led_set1 = <0x0a0b 0x0a28 0x0a82 0x0a0b>; // LED set 1: (10G, 5G, 2.5G) (2.5G, 1G)
+							  // (5G, 10/100) (10G, 5G, 2.5G)
+		led_set2 = <0x0000 0xffff 0x0a20 0x0a01>; // LED set 2: 1000MBit, 10GBit
+	};
+};
+
+&spi0 {
+	status = "okay";
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "u-boot";
+				reg = <0x0 0xe0000>;
+				read-only;
+			};
+			partition@e0000 {
+				label = "u-boot-env";
+				reg = <0xe0000 0x10000>;
+			};
+			partition@f0000 {
+				label = "u-boot-env2";
+				reg = <0xf0000 0x10000>;
+				read-only;
+			};
+			partition@100000 {
+				label = "jffs";
+				reg = <0x100000 0x100000>;
+			};
+			partition@200000 {
+				label = "jffs2";
+				reg = <0x200000 0x100000>;
+			};
+			partition@b300000 {
+				label = "firmware";
+				reg = <0x300000 0xce0000>;
+				compatible = "openwrt,uimage", "denx,uimage";
+				openwrt,ih-magic = <0x93001250>;
+			};
+			partition@fe0000 {
+				label = "log";
+				reg = <0xfe0000 0x20000>;
+			};
+		};
+	};
+};
+
+&ethernet0 {
+	mdio: mdio-bus {
+		compatible = "realtek,rtl838x-mdio";
+		regmap = <&ethernet0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		/* External RTL8218D PHY */
+		phy0: ethernet-phy@0 {
+			reg = <0>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 0>;
+			sds = < 2 >;
+			// Disabled because we do not know how to bring up again
+			// reset-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
+		};
+		phy1: ethernet-phy@1 {
+			reg = <1>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 1>;
+		};
+		phy2: ethernet-phy@2 {
+			reg = <2>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 2>;
+		};
+		phy3: ethernet-phy@3 {
+			reg = <3>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 3>;
+		};
+		phy4: ethernet-phy@4 {
+			reg = <4>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 4>;
+		};
+		phy5: ethernet-phy@5 {
+			reg = <5>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 5>;
+		};
+		phy6: ethernet-phy@6 {
+			reg = <6>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 6>;
+		};
+		phy7: ethernet-phy@7 {
+			reg = <7>;
+			compatible = "ethernet-phy-ieee802.3-c22";
+			rtl9300,smi-address = <0 7>;
+		};
+
+		/* External Aquantia 113C PHYs */
+		phy24: ethernet-phy@24 {
+			reg = <24>;
+			compatible = "ethernet-phy-ieee802.3-c45";
+			rtl9300,smi-address = <1 8>;
+			sds = < 6 >;
+			// Disabled because we do not know how to bring up again
+			// reset-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
+		};
+
+		phy25: ethernet-phy@25 {
+			reg = <25>;
+			compatible = "ethernet-phy-ieee802.3-c45";
+			rtl9300,smi-address = <2 8>;
+			sds = < 7 >;
+			// Disabled because we do not know how to bring up again
+			// reset-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
+		};
+
+		phy26: ethernet-phy@26 {
+			reg = <26>;
+			compatible = "ethernet-phy-ieee802.3-c45";
+			rtl9300,smi-address = <3 8>;
+			sds = < 8 >;
+			// Disabled because we do not know how to bring up again
+			// reset-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
+		};
+
+		/* SFP Ports */
+		phy27: ethernet-phy@27 {
+			compatible = "ethernet-phy-ieee802.3-c22";
+			phy-is-integrated;
+			reg = <27>;
+			rtl9300,smi-address = <4 0>;
+			sds = < 9 >;
+		};
+
+	};
+};
+
+&switch0 {
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan1";
+			phy-handle = <&phy0>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@1 {
+			reg = <1>;
+			label = "lan2";
+			phy-handle = <&phy1>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@2 {
+			reg = <2>;
+			label = "lan3";
+			phy-handle = <&phy2>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@3 {
+			reg = <3>;
+			label = "lan4";
+			phy-handle = <&phy3>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@4 {
+			reg = <4>;
+			label = "lan5";
+			phy-handle = <&phy4>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@5 {
+			reg = <5>;
+			label = "lan6";
+			phy-handle = <&phy5>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@6 {
+			reg = <6>;
+			label = "lan7";
+			phy-handle = <&phy6>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+		port@7 {
+			reg = <7>;
+			label = "lan8";
+			phy-handle = <&phy7>;
+			phy-mode = "xgmii";
+			led-set = <0>;
+		};
+
+		port@24 {
+			reg = <24>;
+			label = "lan9";
+			phy-mode = "usxgmii";
+			phy-handle = <&phy24>;
+			led-set = <1>;
+		};
+		port@25 {
+			reg = <25>;
+			label = "lan10";
+			phy-mode = "usxgmii";
+			phy-handle = <&phy25>;
+			led-set = <1>;
+		};
+		port@26 {
+			reg = <26>;
+			label = "lan11";
+			phy-mode = "usxgmii";
+			phy-handle = <&phy26>;
+			led-set = <1>;
+		};
+
+		port@27 {
+			reg = <27>;
+			label = "lan12";
+			phy-mode = "10gbase-r";
+			phy-handle = <&phy27>;
+			sfp = <&sfp0>;
+			led-set = <2>;
+
+			fixed-link {
+				speed = <10000>;
+				full-duplex;
+				pause;
+			};
+
+		};
+
+		port@28 {
+			ethernet = <&ethernet0>;
+			reg = <28>;
+			phy-mode = "internal";
+			fixed-link {
+				speed = <10000>;
+				full-duplex;
+			};
+		};
+	};
+};